WARNING: Hackers Install Secret Backdoor on Thousands of Microsoft SQL Servers

Cybersecurity researchers today uncovered a sustained malicious campaign dating back to May 2018 that targets Windows machines running MS-SQL servers to deploy backdoors and other kinds of malware, including multi-functional remote access tools (RATs) and cryptominers. Named "Vollgar" after the Vollar cryptocurrency it mines and its offensive "vulgar" modus operandi, researchers at Guardicore