CISA warns Medusa ransomware breached 500+ U.S. critical infrastructure organizations

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 also advised to segment networks to block lateral movement after compromise and to block access from untrusted origins to remote services on internal systems. [...] "Medusa developers typically recruit initial access brokers (IABs) in cybercriminal forums and marketplaces to obtain initial access to potential victims," the advisory says. "Potential payments between $100 USD and $1 million USD are offered to these affiliates with the opportunity to work exclusively for Medusa." Read more of this story at Slashdot.

The FBI warned that the RaaS operation has significantly enhanced its tactics, techniques and procedures, making it harder for defenders to counter

Medusa ransomware has breached more than 500 organizations since it first appeared in June 2021, the FBI, CISA, and the Department of Health and Human Services (HHS) said in an updated joint advisory. The update builds on an advisory first issued in March 2025 and draws on FBI investigations conducted as late as April 2026. “Medusa developers and affiliates have impacted over 500 victims from a variety of critical infrastructure sectors,” the advisory reads, listing … More → The post Medusa ransomware gang has hit over 500 organizations, CISA warns appeared first on Help Net Security.

The FBI said Tuesday that the Medusa ransomware gang has breached more than 500 critical infrastructure organizations in the United States since June 2021. [...]