In a pen test, it’s always the race to the finish. Either you get to the domain admin or r00t or you die tryin’! 🙂 But thanks to some real l33t fu by Hernan Ochoa this has only been made easy for you.
The key to pass-the-hash attacks is that Windows NTLM authentication relies on the passing of the right hash to identify you. As long as the right hash is stored in the authenticated session you are who you say you are.
Hernan Ochoa’s Pass-the-hash toolkit (http://oss.coresecurity.com/projects/pshtoolkit.htm) is precisely the tool for that. Once you gain local admin rights on a box, just run the whosthere.exe utility on the box. Mind you, in differing versions of Windows you need some right addresses to pass as parameters. So the first thing to do is goto C:\WINDOWS\system32 and copy the lsasrv.dll file onto your local machine. The pass-the-hash src tar ball, has an IDA Pro script passthehash.idc that you need to run after opening the file in IDA Pro. This will give you the right addresses to pass to whosthere.exe:
whosthere.exe -a -o outputfile.txt

Once you have the hash you could either use iam.exe or winexe (http://eol.ovh.org/winexe/) with pass-the-hash patch from jo-mo-kun (http://www.foofus.net/jmk/tools/winexe), or samba with jomo kun’s pass the hash patch.
Just set the Environment variable SMBHASH to the hash value such as

export SMBHASH="92D887C9910492C3254E2DF489A880E4:7A2EDE4F51B94203984C6BA21239CF63"

Then run winexe as

./winexe -U "Domain\\Username" //192.168.0.1 "cmd.exe"

Of course, you can also expend some time in cracking the LM hashes to get the actual passwords but it isn’t really necessary.

What www.hak5.org started was quite commendable and I’m really not sure what the status of the Community Rainbow Tables project is at hak5.
They are generating the rainbow tables with the following configuration:

* NTLM
* mixalpha-numeric-all-space
* [abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!@#$%^&*()-_+=~`[]{}|\:;"'<>,.?/ ]
* 26 indexes, 22 files/index
* 572 tables total
* 340.93GB
* 96.07% probability of successful crack

I’m currently generating index 13 and index 26 on this configuration. It would be cool to have multiple people generate it and upload it. I know many people are already doing that as we speak. We should also have SHA1, MD5 project for mixalpha-numberic-all-space configurations.

I started downloading rainbow tables LM Hashes for all symbols. They were 120 GB big and were available for download via torrent. But I’d been stuck at 92.2% of the download forever thinking that there were no seeders. As it turns out, the problem was in the torrent file. The torrent for the 120 GB LM Hashes all symbols can be obtained from 120 GB LM Hashes [all english characters] Rainbow Tables.