; INFO: Nefunguje pod OllyDbg, ale moze fungovat na inych debuggeroch.
;	Pred instrukciou pushfd treba stlacit krokovanie "F7"
;	Debugger moze implementovat debuggovanie prostrednictvom nastavenia TrapFlag-u.
;	- Pri stlaceni "F7" Debugger nastavi programu "TrapFlag"
;	- Aplikacia vykona instrukciou pushfd, ktora ulozi vsetky flagy na stack
;	- vygeneruje sa vynimka
;	- vynimku zachyti debugger a kedze vie, ze ju sposobil on, pokracuje sa dalej

format PE GUI 4.0 at 0x400000

include 'win32a.inc'

section '.text' code readable executable
		pushfd
		pop eax
		
		shr eax, 8
		and eax, 1
		jnz MSG_FOUND
	MSG_OK:
		invoke MessageBoxA, 0, message_ok	,message_caption, MB_OK+MB_ICONINFORMATION
		jmp EXIT
	MSG_FOUND:
		invoke MessageBoxA, 0, message_found,message_caption, MB_OK+MB_ICONINFORMATION
	EXIT:
		ret

section '.bss' readable writeable
	old_protect   dd ?

section '.data' readable
	message_caption db 'MSG',0
	message_ok	    db 'OK',0
	message_found   db 'Debugger found!',0

section '.idata' import data readable writeable
	library \
		kernel32,'KERNEL32.DLL',\
		user32	,'USER32.DLL'
	import kernel32,\
		VirtualProtect	   ,'VirtualProtect'
	import user32,\
		MessageBoxA	   ,'MessageBoxA'

;section '.reloc' fixups data readable discardable