Researchers at Kaspersky Lab have seen a resurgence of Mamba ransomware pop up recently in Brazil and Saudi Arabia.

The San Francisco Municipal Transport Agency says it has contained a ransomware attack, but now it faces new unsubstantiated claims by attackers who say they have 30GB of the agency’s data.

A new ransomware strain called Mamba opts to encrypts hard drives rather than individual files and folders stored on the local disk.