Flag: Tornado!
Hurricane!
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| PEB ProcessHeap Flag Debugger Detection |
Debugging |
ap0x |
ProcessHeap.zip |
March 11 2006 |
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.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
.code
start:
; MASM32 antiRing3Debugger example
; coded by ap0x
; Reversing Labs: http://ap0x.headcoders.net
; Another flag set in PEB that can help us detect ring3 debuggers.
; Example of using this trick can be seen in ExeCryptor.
ASSUME FS:NOTHING
MOV EAX,DWORD PTR FS:[18h]
MOV EAX,DWORD PTR [EAX+30h]
MOV EAX,DWORD PTR[EAX+18h]
CMP DWORD PTR DS:[EAX+10h],0
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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