The FBI and the U.S. Cybersecurity and Infrastructure Security Agency are urging users of popular email services like Gmail and Outlook to be on the lookout for a dangerous and potentially costly ransomware scheme. A bulletin released this week detailed a warning for the Medusa ransomware gang, a group that’s been active since 2021.

The Federal Bureau of Criminal Investigation along with the Cybersecurity Infrastructure Security Agency and the Multi-State Information Sharing and Analysis Center are warning of a new phishing campaign by Medusa ransomware operators targeting email users to gain network access.

The FBI and US Cybersecurity and Infrastructure Security Agency (CISA) have issued a warning about the Medusa ransomware, which has hit hundreds of victims.

Medusa demands a ransom payment of thousands alongside a threat of releasing embarrassing information to the public.