Re: Brute-forcing cached Windows login password hashes

[wymerzp@sbu.edu]

I know for a fact that rainbow tables won't work IF the passwords are salted.

Salt is used to randomize the stored password            hash. With different 
salt value, same password yeilds different hash value. The time-memory 
trade-off technique used by RainbowCrack is not practical when appliable to 
this kind of hash.
http://www.antsight.com/zsl/rainbowcrack/faq.htm

You will have the patch depending on what version of JTR you have:

[T]o add support for cracking of sniffed LM/NTLMv1 challenge/response exchanges 
to John the Ripper. The patch is now listed on John the Ripper homepage and it 
is a part of the latest revision of the jumbo patch for John the Ripper 1.7.2.
http://www.openwall.com/

I believe that the patch exists here:
http://www.foofus.net/~jmk/tools/jtr/john-1.7.2-all-netlm-netntlm-jmk-2.diff

Good Luck,
Zach

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