More than 300 organizations in U.S. critical infrastructure industries, including manufacturing, healthcare, education, insurance, technology, and legal, were disclosed by the FBI, Cybersecurity and Infrastructure Security Agency, and the Multi-State Information Sharing and Analysis Center to have been compromised by the Medusa ransomware-as-a-service operation as of February, BleepingComputer reports.Attacks by Medusa — which emerged in January 2021 but only gained notoriety after breaching Minneapolis Public Schools over two years later — involved the enlistment of initial access brokers who are paid $100 to $1 million to facilitate initial network compromise, noted the agencies in a joint cybersecurity advisory.U.S. organizations have been urged to defend themselves from Medusa ransomware attacks by ensuring up-to-date software, firmware, and systems, implementing network segmentation, and applying network traffic filters.Such an alert comes nearly a month after the FBI and CISA warned of Ghost ransomware intrusions that have targeted organizations in various sectors across more than 70 countries.
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