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OpenRCE Anti Reverse Engineering Technique >> PeID OEP Signature Spoofing

Technique Name Category Analysis By Download Added On Last Updated
PeID OEP Signature Spoofing Analyzing ap0x AntiPeID-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 antiPeID example
; coded by ap0x
; Reversing Labs: http://ap0x.headcoders.net

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

; For example this is BJFNT`s OEP

db 0EBh,03h,3Ah,4Dh,3Ah,1Eh,0EBh,02h,0CDh,20h,9Ch,0EBh,02h,0CDh,20h,0EBh,02h,0CDh,20h,60h

; The AntiPeID-OEP-Signature archive also contains examples for spoofing
; EXE Shield and ExeCryptor

; After this code executes we just align the STACK and continue executing
; like no code was executed before MessageBox.

POPAD
POPFD
POP DS

PUSH 40h
PUSH offset msgTitle
PUSH offset msgText
PUSH 0
CALL MessageBox

PUSH 0
CALL ExitProcess

end start

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