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OpenRCE Anti Reverse Engineering Technique >> RDG OEP Signature Spoofing

Technique Name Category Analysis By Download Added On Last Updated
RDG OEP Signature Spoofing Analyzing ap0x AntiRDG-OEP-Signature.zip 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
       msgTitle db "Scan status:",0h
       msgText db "Fake signature ;)",0h
    .code

start:

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

; RDG checks OEP for signatures. If the byte pattern at OEP matches some of
; the signatures stored in RDG.exe or text database RDG will identify target as
; packer or protector assigned to that signature. So we can insert any number
; of bytes at OEP and make RDG detect the wrong packer.

; For example this is ASProtect`s OEP

PUSH offset @RealStart
CALL @delta
RET
  @delta:
RET

; See the AntiRDG-OEP-Signature.zip archive for a Phantasm example

; Unimportant bytes - junk

db 0Bh,0B6h,66h,0B1h,22h,0B7h

; STACK is aligned, just continue executing.

  @RealStart:
PUSH 40h
PUSH offset msgTitle
PUSH offset msgText
PUSH 0
CALL MessageBox

PUSH 0
CALL ExitProcess

end start

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