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OpenRCE Anti Reverse Engineering Technique >> OllyDbg NtQueryInformationProcess() OllyDbg Detection

Technique Name Category Analysis By Download Added On Last Updated
OllyDbg NtQueryInformationProcess() OllyDbg Detection Debugging ap0x ZwQueryInformationProcess.zip March 11 2006
Description:
    .386
      .model flat, stdcall
      option casemap :none   ; case sensitive

      include \masm32\include\windows.inc
      include \masm32\include\user32.inc
      include \masm32\include\kernel32.inc

      includelib \masm32\lib\user32.lib
      includelib \masm32\lib\kernel32.lib

    .data
       DbgNotFoundTitle db "Debugger status:",0h
       DbgFoundTitle db "Debugger status:",0h
       DbgNotFoundText db "Debugger not found!",0h
       DbgFoundText db "Debugger found!",0h
       ntdll db "ntdll.dll",0h
       zwqip db "NtQueryInformationProcess",0h
    .data?
       NtAddr dd ?
       MinusOne dd ?
    .code

start:

; MASM32 antiOlly example
; coded by ap0x
; Reversing Labs: http://ap0x.headcoders.net

; This example can detect Olly by using NtQueryInformationProcess API.

MOV [MinusOne],0FFFFFFFFh

PUSH offset ntdll ;ntdll.dll
CALL LoadLibrary

PUSH offset zwqip ;NtQueryInformationProcess
PUSH EAX
CALL GetProcAddress

MOV [NtAddr],EAX

MOV EAX,offset MinusOne
PUSH EAX
MOV EBX,ESP

PUSH 0
PUSH 4
PUSH EBX
PUSH 7
PUSH DWORD PTR[EAX]
CALL [NtAddr]

POP EAX

TEST EAX,EAX
JNE @DebuggerDetected

PUSH 40h
PUSH offset DbgNotFoundTitle
PUSH offset DbgNotFoundText
PUSH 0
CALL MessageBox

JMP @exit
  @DebuggerDetected:

PUSH 30h
PUSH offset DbgFoundTitle
PUSH offset DbgFoundText
PUSH 0
CALL MessageBox

  @exit:

PUSH 0
CALL ExitProcess

end start

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