minimal size of fasm program

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e4key

Joined: 30 Jul 2009
Posts: 8

e4key 13 Oct 2009, 15:52

hi all. please write minimal (size) program on fasm Smile

for example, program, who move 1 into eax Smile

thanks.

13 Oct 2009, 15:52

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 19869
Location: In your JS exploiting you and your system

revolution 13 Oct 2009, 15:53

Code:

mov eax,1

13 Oct 2009, 15:53

Tomasz Grysztar

Joined: 16 Jun 2003
Posts: 8263
Location: Kraków, Poland

Tomasz Grysztar 13 Oct 2009, 15:59

Do you mean size of source or size of binary? Smile

revolution wrote:

Code:

mov eax,1

Code:

xor eax,eax
inc eax

However, since it is posted in "Windows" forum, I think he really meant the smallest PE program.

13 Oct 2009, 15:59

r22

Joined: 27 Dec 2004
Posts: 805

r22 13 Oct 2009, 16:23

Windows PE has EAX at 0 to start.

Code:

inc eax

13 Oct 2009, 16:23

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 19869
Location: In your JS exploiting you and your system

revolution 13 Oct 2009, 16:31

Code:

include 'win32ax.inc'
.code
x:mov eax,1
ret
.end x

Ugly, but small.

13 Oct 2009, 16:31

e4key

Joined: 30 Jul 2009
Posts: 8

e4key 13 Oct 2009, 17:57

mmm... inc eax don't compile Sad

not errors, but the binary file does not appear.

revolution, your code compiled... 1.5kb. is the smallest?

thanks Smile

13 Oct 2009, 17:57

Fanael

Joined: 03 Jul 2009
Posts: 168

Fanael 13 Oct 2009, 18:16

Code:

format PE GUI
times 508 nop
xor eax, eax
inc eax
ret

13 Oct 2009, 18:16

Azu

Joined: 16 Dec 2008
Posts: 1159

Azu 04 Nov 2009, 17:43

Use the Google Very Happy

Someone made a Win32 program only like 100 bytes that downloads and executes a remote file and works on most versions of Windows.

_________________

04 Nov 2009, 17:43

rugxulo

Joined: 09 Aug 2005
Posts: 2341
Location: Usono (aka, USA)

rugxulo 04 Nov 2009, 17:52

Raw PE format again (Grom PE)

700 byte Win32 PE GUI (handcoded) file. Is that what you wanted??

04 Nov 2009, 17:52

Fanael

Joined: 03 Jul 2009
Posts: 168

Fanael 04 Nov 2009, 18:50

It's not a valid PE.

04 Nov 2009, 18:50

Azu

Joined: 16 Dec 2008
Posts: 1159

Azu 04 Nov 2009, 18:56

Whoops I was wrong, 133 bytes actually. But still, way smaller than anything in this thread.

_________________

04 Nov 2009, 18:56

narada

Joined: 15 Feb 2008
Posts: 77
Location: Ukraine, Dnepropetrovsk

narada 04 Nov 2009, 20:04

LOL 1 byte. nop

04 Nov 2009, 20:04

Azu

Joined: 16 Dec 2008
Posts: 1159

Azu 04 Nov 2009, 20:21

LOL, nope.
Windows won't run a program that doesn't even start with MZ. Try again.

_________________

04 Nov 2009, 20:21

Fanael

Joined: 03 Jul 2009
Posts: 168

Fanael 04 Nov 2009, 20:52

So I'm still ahead, nobody posted a valid PE smaller than mine.

04 Nov 2009, 20:52

Azu

Joined: 16 Dec 2008
Posts: 1159

Azu 04 Nov 2009, 20:58

Guess you missed the link.

_________________

04 Nov 2009, 20:58

Fanael

Joined: 03 Jul 2009
Posts: 168

Fanael 05 Nov 2009, 07:40

I didn't. Minimal file alignment is 512 bytes, minimal section alignment is 4096 bytes, that file isn't actually a valid PE.

05 Nov 2009, 07:40

kohlrak

Joined: 21 Jul 2006
Posts: 1421
Location: Uncle Sam's Pad

kohlrak 05 Nov 2009, 10:32

If you're worried about valid PE, i read one of the reasons why AVs FP all over fasm made programs and fasm itself is that fasm generates invalid PE files. So, until you make a PE from scratch, your PE's probably invalid too.

05 Nov 2009, 10:32

Azu

Joined: 16 Dec 2008
Posts: 1159

Azu 05 Nov 2009, 14:50

Fanael wrote:

I didn't. Minimal file alignment is 512 bytes, minimal section alignment is 4096 bytes, that file isn't actually a valid PE.

It is according to the Windows operating system developed by Microsoft Corporation.

_________________

05 Nov 2009, 14:50

Borsuc

Joined: 29 Dec 2005
Posts: 2465
Location: Bucharest, Romania

Borsuc 05 Nov 2009, 18:52

Azu wrote:

It is according to the Windows operating system developed by Microsoft Corporation.

It didn't work.

_________________
Previously known as The_Grey_Beast

05 Nov 2009, 18:52

Azu

Joined: 16 Dec 2008
Posts: 1159

Azu 05 Nov 2009, 18:55

Borsuc wrote:

Azu wrote:
the Windows operating system
It didn't work.

It never will.

_________________

05 Nov 2009, 18:55

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