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Re: Cracking Steganography Application in less than ONE minute



On 6 Jan 2007 19:39:21 -0000, thesinoda@xxxxxxxxxxx
<thesinoda@xxxxxxxxxxx> 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")]) {}