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OpenRCE Anti Reverse Engineering Technique >> ProcDump PE Header Corruption

Technique Name Category Analysis By Download Added On Last Updated
ProcDump PE Header Corruption Dumping ap0x AntiProcDump.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
OLDProtect dd 02040001h
    .code

start:

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

; This example takes advantage of ProcDump making full image dump
; including the header. So this example will erase sections from PEHeader.
; To do this we must first make PEHeader writable by using VirtualProtect
; after which we access the header and place 0x00 in PEHeader.

PUSH offset OLDProtect
PUSH 40h
PUSH 00001000h
PUSH 00400000h
CALL VirtualProtect

; Read elfanew from PEHeader
MOV EBX,0040003Ch
MOV ECX,DWORD PTR[EBX]
ADD ECX,00400006h

XOR EBX,EBX  
; BX is SectionNumber
MOV BX,WORD PTR[ECX]
PUSH ECX
; ECX is a pointer to PESections table
ADD ECX,0F2h

@clear_section:
; One section table item size
MOV EDX,28h
@clear_section_s:
; Clear byte
MOV BYTE PTR[ECX],0h
INC ECX
DEC EDX
JNE @clear_section_s
; Erase all sections
DEC EBX
JNE @clear_section
; Clear SectonNumber from PEHeader
POP ECX
MOV WORD PTR[ECX],BX

PUSH 0
CALL ExitProcess

end start

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