Microsoft has cracked down on Fox Tempest, a cyber threat actor that fueled Rhysida ransomware attacks and developed tools for major malware strains like Oyster, Lumma Stealer, and Vidar. On May 19, the tech giant unsealed a legal case in the US District Court for the Southern District of New York focused on the group. It also shared details of how its Digital Crimes Unit (DCU) agents have engaged with Fox Tempest’s operators using undercover personas, identified the group’s infrastructure, collaborated with some of the organizations hosting this infrastructure and disrupted the group’s operations. Microsoft is now working with the FBI and Europol’s European Cybercrime Centre (EC3) to uncover the identity of people behind the group. Fox Tempest: A Prolific Cybercrime-Enabling Group Fox…