Cracking Passwords for $600: The Mandiant NTLMv1 rainbow table database Release

Legacy security just met its executioner. Cybersecurity firm Mandiant has released a massive rainbow table database designed to crack any administrative password protected by Microsoft’s aging NTLMv1 hashing algorithm.

Mandiant NTLMv1 rainbow table database: A death sentence for legacy auth

By making this database public, Mandiant is essentially forcing the hands of IT administrators who haven't yet migrated to more secure protocols. NTLMv1 has been known to be weak for over two decades, but its limited keyspace makes it an easy target for precomputed hash matching. Mandiant’s release drastically lowers the barrier to entry for such attacks.

New ammo for security professionals and hackers alike

According to Mandiant, the database allows researchers to recover passwords in under 12 hours using consumer-grade hardware. While intended as a tool for defenders to prove vulnerabilities, it’s equally accessible to malicious actors. The data specifically targets Net-NTLMv1 passwords used in network authentication, such as SMB file sharing.