监控Explorer的进程创建问题

监控Explorer的进程创建问题

上一篇 / 下一篇  2008-08-23 14:50:57

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近日笔者收到某网友的信件称,“为何自己写的监控 Explorer 进程代码运行后,系统会崩溃。”现笔者就这一 问题,拿出与用户共同探讨。NT 下的 Explorer 通过 CreateProcessInternalW建立,R3的控制权。代码如下:

      bInheritHandles,
  DWORD dwCreationFlags,
  LPVOID lpEnvironment,
  LPCWSTR lpCurrentDirectory,
  LPSTARTUPINFOW lpStartupInfo,
  LPPROCESS_INFORMATION lpProcessInformation,
  PHANDLE hNewToken);
  int APIENTRY DllMain(HINSTANCE hInstance, DWORD dwReason, LPVOID lpReserved)
  {
  UNREFERENCED_PARAMETER(lpReserved);
  if (dwReason == DLL_PROCESS_ATTACH)
  {
  ExampleJmp();
  }
  else if (dwReason == DLL_PROCESS_DETACH)
  {
  SetHookOff();
  }
  return 1;
  }
  void HookOneAPI(LPCTSTR ModuleName, LPCTSTR ApiName, FARPROC lpNewFunc)
  {
  BYTE str[8] = { 0x0B8, 0x0, 0x0, 0x40, 0x0, 0x0FF, 0x0E0,0}; // mov eax,addr jmp eax
  memcpy(m_NewFunc,str,8);
  m_lpHookFunc = GetProcAddress(GetModuleHandle(ModuleName),ApiName);
  m_hProc = GetCurrentProcess();
  memcpy(m_OldFunc,(char *)m_lpHookFunc,8);
  *(DWORD *)( m_NewFunc + 1 ) = (DWORD)lpNewFunc;
  }
  void WINAPI SetHookOn()
  {
  MEMORY_BASIC_INFORMATION mbi;
  VirtualQuery(m_lpHookFunc,&mbi,sizeof(mbi));
  VirtualProtect(m_lpHookFunc,sizeof(DWORD),PAGE_READWRITE,0);
  DWORD dwOldFlag;
  WriteProcessMemory(m_hProc, (void *)m_lpHookFunc,
  (void *)m_NewFunc, 8,&dwOldFlag);
  }
  void WINAPI SetHookOff()
  {
  DWORD dwOldFlag;
  WriteProcessMemory(m_hProc, (void *)m_lpHookFunc,
  (void *)m_OldFunc, 8, &dwOldFlag);
  }
  BOOL WINAPI MyCreateProcess(HANDLE hToken,
  LPCWSTR lpApplicationName,
  LPWSTR lpCommandLine,
  LPSECURITY_ATTRIBUTES lpProcessAttributes,
  LPSECURITY_ATTRIBUTES lpThreadAttributes,
  BOOL bInheritHandles,
  DWORD dwCreationFlags,
  LPVOID lpEnvironment,
  LPCWSTR lpCurrentDirectory,
  LPSTARTUPINFOW lpStartupInfo,
  LPPROCESS_INFORMATION lpProcessInformation,
  PHANDLE hNewToken)
  {
  BOOL BReturn=TRUE;
  SetHookOff();
  CreateProcessHH CreateProcessHHH=(CreateProcessHH)GetProcAddress(GetModuleHandle("Kernel32.dll"),"CreateProcessInternalW");
  BReturn=CreateProcessHHH(hToken,lpApplicationName,lpCommandLine,lpProcessAttributes
  ,lpThreadAttributes,bInheritHandles,dwCreationFlags,lpEnvironment,lpCurrentDirectory,
  lpStartupInfo,lpProcessInformation,hNewToken);
  SetHookOn();
  return BReturn;
  }
  BOOL UpPrivilege(HANDLE hprocess,LPCTSTR lpname) //提升进程权限 debug
  {
  HANDLE hToken;
  TOKEN_PRIVILEGES Privileges;
  LUID luid;
  OpenProcessToken(hprocess,TOKEN_ADJUST_PRIVILEGES,&hToken);
  Privileges.PrivilegeCount=1;
  LookupPrivilegeValue(NULL,lpname,&luid);
  Privileges.Privileges[0].Luid=luid;
  Privileges.Privileges[0].Attributes=SE_PRIVILEGE_ENABLED;
  if(AdjustTokenPrivileges(hToken,FALSE,&Privileges,NULL,NULL,NULL)!=0)
  return TRUE;
  return FALSE;
  }
  void WINAPI ExampleJmp()
  {
  char privilege[]=SE_DEBUG_NAME;
  HANDLE hprocess;
  hprocess=GetCurrentProcess();
  if(!UpPrivilege(hprocess,privilege)) //开始提权
  {
  exit(-1);
  }
  HookOneAPI("Kernel32.dll","CreateProcessInternalW",(FARPROC)MyCreateProcess);
  SetHookOn();
  }

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