bugtraq - Re: Cracking Steganography Application in less than ONE minute

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Date: Tue, 9 Jan 2007 20:29:15 +0100
From: "Michal Spadlinski" <gim913@...il.com>
To: "thesinoda@...mail.com" <thesinoda@...mail.com>
Cc: bugtraq@...urityfocus.com
Subject: Re: Cracking Steganography Application in less than ONE minute

On 6 Jan 2007 19:39:21 -0000, thesinoda@...mail.com
<thesinoda@...mail.com> wrote:
> Good day
>
> If you look at the end of your steged file you will notice it will end with 30 00 02 FF FF. So a simple HEX search will reveal all steged files.
>

According, to what you've written, I've created simple signature
for clamav:

mkdir testing
cd testing

echo "Steganography:0:EOF-5:3000(00|01|02|03|04|05|06|07|08|09|0a|0b|0c|0d|0e|0f)ffff"
> stego.ndb

this can be tested in following way:

for i in `seq -f %3.0f 0 255`;
do
  perl -e 'print "A"x100' > test_$i;
  printf "0: 3000 %02xff ff\n" $i | xxd -r >> test_$i;
done

and running clamav, against samples:

clamscan --database=clamav_stego.ndb .

[and later clamscan --database=clamav_stego.ndb /]

 cheers,
-- 
 main (int a, char *b[puts("Michal 'GiM' Spadlinski")]) {}