The San Francisco Municipal Transportation Agency (SEMTA) was infected with a HDDCryptor ransomware over the weekend. Employee computers were presented with the message “You Hacked, ALL Data Encrypted. Contact For Key (firstname.lastname@example.org) ID:681, Enter”.
The attack was made using Mamba which rewrites a computer’s Master Boot Record. Local reports indicates that critical assets like payroll, a MySQL database and email servers, as well as employees’ personal computers may have been compromised in the attack.
The attack is estimated to cost the agency US$559,000 each day until resolved.