hashcat Forum

I ran into this issue recently during a CTF competition and spent a little time replicating a test scenario. Given a 13-char password as an LM hash, Hashcat (v5.1.0) successfully cracks the first hash but not the second.

To re-create the issue I padded Hashcat's example LM hash out to 13-chars:

HASHCATHASHCA = 299BD128C1101FD6A9BF21707E39C1C7

And ran a typical attack for LM hashes:

Code:
$ hashcat '299BD128C1101FD6A9BF21707E39C1C7' -m3000 -a3 -1 ?u?d?s ?1?1?1?1?1?1?1

$ hashcat '299BD128C1101FD6A9BF21707E39C1C7' -m3000 --show

299bd128c1101fd6a9bf21707e39c1c7:HASHCAT[notfound]

As a sanity check I ran a John session on the same hash:

Code:
$ john lm_test.hash --format=LM-opencl --fork=4

$ john lm_test.hash --format=LM-opencl --show

Device 3: GeForce GTX 1080

?:HASHCATHASHCA

2 password hashes cracked, 0 left

HASHCA is not 7 characters long (?1?1?1?1?1?1?1 cracks 7 char passwords)

(11-13-2019, 02:00 PM)philsmd Wrote: [ -> ]HASHCA is not 7 characters long (?1?1?1?1?1?1?1 cracks 7 char passwords)

Holy cow, I'm having senior moments and haven't yet met the age requirement. Of course, I overlooked incremental...

Thanks Philsmd!

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philsmd

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