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OpenRCE Anti Reverse Engineering Technique >> Detecting SoftICE by Opening Its Drivers

Technique Name Category Analysis By Download Added On Last Updated
Detecting SoftICE by Opening Its Drivers 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

.data
szMsgTitle db "Detection by means of CreateFileA", 00h
szDebuggerFound db "SoftICE found", 00h
szDebuggerNotFound db "SoftICE not found", 00h

DelayESP dd 0
PreviousSEH dd 0

szSoftIce9x db "\\.\SICE", 00h
szSoftIceNT db "\\.\NTICE", 00h

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

push NULL
push FILE_ATTRIBUTE_NORMAL
push NULL
push OPEN_EXISTING
push FILE_SHARE_READ
push FILE_FLAG_WRITE_THROUGH
push offset szSoftIce9x
call CreateFileA

cmp eax, -1
jz @@NoSoftIce9x

push word ptr 1
jmp short @@DebuggerFound
  
  @@NoSoftIce9x:
push NULL
push FILE_ATTRIBUTE_NORMAL
push OPEN_EXISTING
push NULL
push FILE_SHARE_READ
push FILE_FLAG_WRITE_THROUGH
push offset szSoftIceNT
call CreateFileA

cmp eax, -1
push dword ptr 1

jnz short @@DebuggerFound

pop eax

push dword ptr 0
  
  @@DebuggerFound:
push dword ptr [PreviousSEH]
call SetUnhandledExceptionFilter

pop eax
test eax,eax
jnz @@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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