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OpenRCE Anti Reverse Engineering Technique >> RDTSC Instruction Debugger Latency Detection

Technique Name Category Analysis By Download Added On Last Updated
RDTSC Instruction Debugger Latency Detection Debugging ap0x RDTSC March 11 2006
Description:
; #########################################################################

      .586
      .model flat, stdcall
      option casemap :none   ; case sensitive

; #########################################################################
      include \masm32\include\windows.inc
      include \masm32\include\user32.inc
      include \masm32\include\kernel32.inc
      include \masm32\include\comdlg32.inc
      
      includelib \masm32\lib\user32.lib
      includelib \masm32\lib\kernel32.lib
      includelib \masm32\lib\comdlg32.lib
      
; #########################################################################  
    .data
       DbgNotFoundTitle db "Debugger status:",0h
       DbgFoundTitle db "Debugger status:",0h
       DbgNotFoundText db "Debugger stepping not found!",0h
       DbgFoundText db "Debugger stepping found!",0h
    .code

start:

; MASM32 antiRing3Debugger example
; coded by ap0x
; Reversing Labs: http://ap0x.headcoders.net

; This code calculates time of code execution betwean two RDTSC
; instructions. RDTSC stores time in EAX.
; If this time is greater than 0xFFF then debugger is present.

RDTSC
XOR ECX,ECX
ADD ECX,EAX
RDTSC
SUB EAX,ECX
CMP EAX,0FFFh
JNB @OllyDetected

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

  @OllyDetected:

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

end start

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