waliedassar

Anti-ChildDebugging

Dec 16th, 2012
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  1. //http://waleedassar.blogspot.com
  2. //http://www.twitter.com/waleedassar
  3. //The following code prevents the debugger e.g. WinDbg or OllyDbg v2.x from catching
  4. //the child process and debugging it.
  5. #include "stdafx.h"
  6. #include "windows.h"
  7. #include "stdio.h"
  8.  
  9. #define ProcessDebugFlags 0x1F
  10.  
  11. extern "C"
  12. {
  13. int __stdcall ZwSetInformationProcess(HANDLE,unsigned long,unsigned long*,unsigned long);
  14. }
  15.  
  16.  
  17. int main(int argc, char* argv[])
  18. {
  19.     //The following call cause the "NoDebugInherit" bit of the _EPROCESS structure to be set to 1.
  20.     unsigned long value=0x0; //This value will be inversed and stored in NoDebugInherit.
  21.     int ret=ZwSetInformationProcess(GetCurrentProcess(),ProcessDebugFlags,&value,0x4);
  22.     if(ret>=0)
  23.     {
  24.         STARTUPINFO SI={sizeof(SI)};
  25.         PROCESS_INFORMATION PI;
  26.         if(!CreateProcess(0,"calc.exe",0,0,TRUE,0,0,0,&SI,&PI)) return 0;
  27.         while(1) Sleep(1000);
  28.     }
  29.     return 0;
  30. }
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