Flag: Tornado!
Hurricane!
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| IsDebuggerPresent() Direct PEB Access |
Debugging |
ap0x |
kernel32-IsDebuggerPresent.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
; This example can detect all ring3 debuggers by accessing PEB!BeingDebuged.
; You can see this code in kernel32.dll!IsDebuggerPresent function.
ASSUME FS:NOTHING
MOV EAX,DWORD PTR FS:[18h]
MOV EAX,DWORD PTR DS:[EAX+30h]
MOVZX EAX,BYTE PTR DS:[EAX+2h]
CMP EAX,1
JE @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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