Federal agencies are warning Gmail and Outlook email users of a costly ransomware scheme that has already affected more than 300 victims. The FBI and the U.S. Cybersecurity and Infrastructure Security Agency issued the advisory, detailing a warning about the Medusa hacking organization, which has been active since 2021.

Federal authorities have issued an advisory warning people of Medusa ransomware that has breached the data of more than 300 people since February.

The FBI is among several government warning against phishing schemes on Outlook and Gmail, with over 300 victims targeted.