Well-known expert on the Russian “hacker” underground, Brian Krebs received a file with profiles, personal messages and password hashes from 41 037 accounts of the
Antichat.ru forum over the last ten years before June 2010, when the forum was hacked. Brian decided to test the hashes for durability using the
EVGA GTX 295 graphics card and the
Hashcat program for brute force under CUDA. For 18 days, managed to pick up 44% of all passwords.
Using passwords to log in with someone else’s account on Antichat.ru is problematic. After hacking, administrators turned on the binding to the IP address during authorization for all users.
Brian, with some irony,
writes that the Russian “Kul Hackers” are not very strong in choosing passwords. More than 18,000 passwords out of 41,037 were cracked in a few days. About 4,500 passwords were used by five or more users.

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Brian also read the users' private messages and came to the conclusion that most of them are short, trivial and insignificant (like “How to make this bot work?”). But sometimes there are serious transactions involving the theft of private and financial data from banks and individuals.