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Date: Fri, 17 Oct 2008 20:49:15 +0200
From: Yannick HAMON <yannick.hamon@...opartners.com>
To: john-users@...ts.openwall.com
Subject: [ lm2ntcrack ] A simple tool to crack instantly Microsoft Windows NT Hash (MD4) when the LM Password is known.
Hi everybody,
I want to share with you a simple tool that I have developped :
"lm2ntcrack". I hope that it will help some guy...
http://www.xmcopartners.com/lm2ntcrack/index.html
This tool provides a simple way to crack instantly Microsoft Windows
NT Hash (MD4) when the LM Password is known.
It is entirely written in perl, so its easily ported and installed.
This program must be used with the password cracker "John the Ripper"
http://www.openwall.com/john/
* Why lm2ntcrack ??
I've often encountered a problem during Windows penetration testing
and password assessment.
On the one hand, launching my favorite password cracker during few
minutes on the dumped Windows passwords hashes, permits to crack many
LM passwords but cracked password cannot be used as is (uppercase
version of the Windows password).
On the other hand, password cracking on NT hash is quiet long and
after few days it cracks only some password.
Here is my big deal. I've got the LM password but it is only in
UpperCase because LM Hashes are not case sensitive. So, these
passwords cannot be reuse in this form.
* Example: Password cracker output for "Administrator" account :
=> LM password is ADMINISTRAT0R.
=> NT password is ?????????????.
I'm not so lucky because the case-sensitive password isn't
"administrat0r" or "Administrat0r". So I cannot use this to connect on
the audited Windows system.
This password contains 13 characters but launching my password cracker
on the NT hash is a waste of time and there is a poor chance of success.
* Note :
13 characters : 1 number + 12 case-sensitives letters => 2^12 = 4096
choices (DAMN IT, I cannot test them all manually)
... I need a TOOL !!!! Not a magic one but a simple tool which can do
this task for me.
In this example, "lm2ntcrack" will generate the 4096 possibilities for
the password "ADMINISTRAT0R" and, for each one, the associated NT MD4
hash. Then, search for matching with the dumped hash.
Estimated time : < 2 seconds to crack more than 1200 NT Hashes (it is
very fast instead of Perl !!! lol)
Enjoy !!!!
* Example :
[yann@...opartners:~/lm2ntcrack]$ time perl lm2ntcrack.pl -v -
l="AZERTY123$" -n="81CD1A1C4CBCE05C0F8D411ACEC7587F"
############################################################################
# NT Password cracker from LM password
# Version : 0.5a - Oct 2008
# By Yannick HAMON <yannick.hamon@...opartners.com>
# Homepage : http://www.xmcopartners.com
############################################################################
[INFO] : "AZERTY123$" has 10 character(s) but contains 4 special(s)
char(s) and/or integer(s)
[INFO] : => 64 words will be generated ...... OK !!
[INFO] : Crack NT password from "AZERTY123$" and NT HASH
"81CD1A1C4CBCE05C0F8D411ACEC7587F"
[CRACKED] AZERTY123$ => azERTy123$
real 0m0.033s
user 0m0.025s
sys 0m0.007s
* NB :
Recently, after developped this fabulous TOOL, I've found an old post
on "openwall mailing-list" :
http://www.openwall.com/lists/john-users/2006/07/08/2
This post explains how to crack NT hash from LM password with john-the-
ripper (need to modify john's configuration file to use
[List.Rules:NT] section and stop running john on the LM hashes).
john -show pwfile | cut -d: -f2 > cracked
john -w=cracked -rules -format=nt pwfile
john -show -format=nt pwfile
One known problem with this approach is that it'll fail for passwords
containing colons (':' is cut delimiter).
This problem does not impact "lm2ntcrack" and you can use "lm2ntcrack"
while john is cracking LM hashes.
--
Yannick Hamon <yannick.hamon@...opartners.com>
IT Security Consultant
Xmco Partners | Security Research Labs
http://www.xmcopartners.com
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