Death Knell for LastPass? Hackers stole customers’ password vaults

[Telos]

The cache of customer password vaults is stored in a “proprietary binary format” that contains both unencrypted and encrypted vault data, but technical and security details of this proprietary format weren’t specified.

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Odd though that TechCrunch says...

The good news is that any account protected with two-factor authentication will make it far more difficult for an attacker to access your accounts without that second factor, such as a phone pop-up or a texted or emailed code.

But with the vault in hand, 2FA is meaningless.