Re: Crack MSN hashes?

[Kish Pent <kish_pent () yahoo com>]

Hi Matheus,

The MSN Messenger uses the MSNP Protocol. The current version uses 13 or 14/15 too maybe ... Not sure which one's used 
here correctly.
This is a copy of the IETF draft of MSN Messenger service 1.0 protocol, 
http://www.hypothetic.org/docs/msn/ietf_draft.php

I think it's version 14 or 15 of the MSNP in the current OneLive / Windows Live Messenger. You can get unofficial 
documentation and additional protocol information from the MSNPiki : http://msnpiki.msnfanatic.com/index.php/Main_Page

The MSNPiki has documented the protocols from v8 to v15. I assume that you have used Wireshark (formerly Ethereal) to 
sniff the hashes, because the syntax is decodable only using this tool.

Refer http://msnpiki.msnfanatic.com/index.php/MSN_Protocol_Version_15

You can also check out the Tweener SSO feature at the MSNPiki.

If you understand the protocol carefully, and see the authentication, you can extend hydra with your own MSNP(version 
X) module :)


HTH, Cheers !
Kish



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Kishore Parthasarathy, 
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----- Original Message ----
From: Matheus Michels <matheustmichels () gmail com>
To: pen-test () securityfocus com
Sent: Monday, April 28, 2008 5:57:55 AM
Subject: Crack MSN hashes?

Good morning all,

After sniffing for a couple of hours an ISP network, I got a bunch of
MSN Messenger traffic, like the packet below (I masked some chars to
protect the guy):

---------------------------------------------------------------------------
UBN xxxx () hotmail com 10 495
ACK MSNMSGR:xxxxxx () hotmail com MSNSLP/1.0
To: <msnmsgr:xxxxxx () hotmail com>
From: <msnmsgr:xxxx () hotmail com>
Via: MSNSLP/1.0/TLP ;branch={E6321020-D46B-4DBC-A799-BD8F1C686B6D}
CSeq: 0
Call-ID: {00000000-0000-0000-0000-000000000000}
Max-Forwards: 0
Content-Type: application/x-msnmsgr-turnsetup
Content-Length: 144

ServerAddress: 207.46.112.175
SessionUsername: IZm4/GI6rJdhxxxxxxxxxxXaDENO5bRyJWUjvs8ChwX+BOmy
SessionPassword: 7Y0pJxxxxxxxc8b8HQ/4bw==
---------------------------------------------------------------------------

I was wondering how could I crack these hashes. They don't seem to be
neither MD5 nor SHA. The SessionUsername has always 48 digits, and the
SessionPassword has always 24. Does anyone know what type of cipher
does MSN use? And is there some tool to attempt dictionary attacks
against them?

Please note that I am NOT talking about the stuff stored by MSN in the
registry when you check the option "remember my password". I mean the
hashes transmitted by MSN over the network.

Thanks

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