MZÇ processed: MZÇ error: illegal instruction.

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newbieFasm

Joined: 19 Apr 2022
Posts: 1

newbieFasm 19 Apr 2022, 08:17

format PE console
entry start

include 'win32a.inc'

;===============================
section '.text' code readable executable

start:
inc eax
inc eax
push 0
call [ExitProcess]

;========================
section '.idata' import data readable

library kernel,'kernel32.dll'

import kernel,\
ExitProcess,'ExitProcess'

i am having an error that says like this after running the exe file (fasm filename.exe) "MZÇ processed: MZÇ error: illegal instruction.

Description:
Filesize:	10.92 KB
Viewed:	3530 Time(s)

19 Apr 2022, 08:17

bitRAKE

Joined: 21 Jul 2003
Posts: 4121
Location: vpcmpistri

bitRAKE 19 Apr 2022, 08:20

fasm is intended to process source code and not .EXE file. The first parameter on command line is source file name.

19 Apr 2022, 08:20

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20489
Location: In your JS exploiting you and your system

revolution 19 Apr 2022, 09:01

Code:

C:\> fasm increment.asm

19 Apr 2022, 09:01

macomics

Joined: 26 Jan 2021
Posts: 1052
Location: Russia

macomics 19 Apr 2022, 12:26

Code:

copy increment.asm increment.exe
fasm increment.exe

19 Apr 2022, 12:26

sinsi

Joined: 10 Aug 2007
Posts: 794
Location: Adelaide

sinsi 20 Apr 2022, 06:01

macomics wrote:

Code:

copy increment.asm increment.exe
fasm increment.exe

Haven't tested but that should fail, since FASM has increment.exe open as source but shouldn't be able to write to increment.exe without an error.
If it did then you've just lost your source code Smile

20 Apr 2022, 06:01

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20489
Location: In your JS exploiting you and your system

revolution 20 Apr 2022, 06:09

sinsi wrote:

macomics wrote:
Code:
copy increment.asm increment.exe
fasm increment.exe    
Haven't tested but that should fail, since FASM has increment.exe open as source but shouldn't be able to write to increment.exe without an error.
If it did then you've just lost your source code

In PREPROCE.INC:

Code:

;...
        call    read
        call    close
;...

After reading the source the file is closed. So it should be fine to overwrite your source if you want to. Smile

20 Apr 2022, 06:09

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