CISA says the Medusa ransomware operation has breached more than 500 U.S. critical infrastructure organizations since 2021, up from more than 300 reported last year. The group has targeted healthcare, government, defense, manufacturing, IT and financial organizations, evolving into a ransomware-as-a-service operation that recruits initial-access brokers and uses stolen data to pressure victims into paying. BleepingComputer reports: The three federal agencies recommended that network defenders secure their networks against the ransomware group's attacks by mitigating security vulnerabilities to protect operating systems, software, and firmware from exploitation attempts. Security teams are al...