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OpenRCE Anti Reverse Engineering Technique >> Detecting SoftICE by searching for the Int 3h in UnhandledExceptionFilter

Technique Name Category Analysis By Download Added On Last Updated
Detecting SoftICE by searching for the Int 3h in UnhandledExceptionFilter Debugging halsten July 10 2007 July 10 2007
Description:

; ----------------------------------------------------------------------
;
; Author: halsten
; E-mail: halsten [at] gmail [dot] com
; Website: http://iamhalsten.thecoderblogs.com/
;
; -----------------------------------------------------------------------

.386p
model flat
locals
jumps
UNICODE=0
include w32.inc

extrn SetUnhandledExceptionFilter :PROC
extrn UnhandledExceptionFilter :PROC

.data
szMsgTitle db "Detecting SoftICE by searching for the Int 3h instruction in UnhandledExceptionFilter", 00h
szDebuggerFound db "SoftICE found", 00h
szDebuggerNotFound db "SoftICE not found", 00h

DelayESP dd 0
PreviousSEH dd 0

.code
EntryPoint PROC
mov [DelayESP], esp
push offset @@Error
call SetUnhandledExceptionFilter
mov [PreviousSEH], eax

mov eax, offset UnhandledExceptionFilter
mov eax, [eax + 2]
mov eax, [eax]
push eax

push dword ptr [PreviousSEH]
call SetUnhandledExceptionFilter
pop eax

cmp byte ptr [eax], 0cch
jz @@DebuggerFound

  @@DebuggerNotFound:
   push 0
   push offset szMsgTitle
   push offset szDebuggerNotFound
   push 0
   call MessageBoxA
  
   push -1
   call ExitProcess
  
  @@DebuggerFound:
   push 0
   push offset szMsgTitle  
   push offset szDebuggerFound
   push 0
   call MessageBoxA
  
   push -1
   call ExitProcess  
  
  @@Error:
   mov esp, [DelayESP]
push offset @@DebuggerNotFound

ret
EntryPoint ENDP

ends
end EntryPoint

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