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Federal cybersecurity agencies, including the FBI and CISA, have issued an urgent advisory regarding the escalating threat of Medusa ransomware. Since its emergence in 2021, Medusa has targeted over 300 victims across various critical infrastructure sectors, including medical, education, legal, insurance, technology, and manufacturing. The group's activities have accelerated in recent months, prompting immediate action recommendations for organizations. Medusa operates as a Ransomware-as-a-Service (RaaS) model, now recruiting affiliates from criminal forums to launch attacks, encrypt data, and extort victims worldwide.

Medusa actors leverage common ransomware tactics, including phishing campaigns and exploiting unpatched software vulnerabilities. They employ a double extortion strategy by encrypting victim data and threatening to publicly release it if the ransom is not paid. To mitigate the risk, CISA and the FBI recommend organizations update systems regularly to close known vulnerabilities, implement network segmentation to restrict lateral movement, and enable multi-factor authentication for all services. They also urge organizations to report incidents promptly to aid in tracking and combating the growing threat.

ImgSrc: www.zdnet.com

References :

• bsky.app: CISA says the Medusa ransomware operation has impacted over 300 organizations in critical infrastructure sectors in the United States until last month.
• www.bleepingcomputer.com: CISA: Medusa ransomware hit over 300 critical infrastructure orgs
• securityonline.info: FBI, CISA, and MS-ISAC Warn Organizations About Medusa Ransomware Attacks
• DataBreaches.Net: #StopRansomware: Medusa Ransomware
• Industrial Cyber: US exposes Medusa ransomware threat, as over 300 organizations targeted across critical infrastructure sector
• securityaffairs.com: SecurityAffairs article: Medusa ransomware hit over 300 critical infrastructure organizations until February 2025
• www.cybersecuritydive.com: Medusa ransomware slams critical infrastructure organizations
• www.itpro.com: CISA issues warning over Medusa ransomware after 300 victims from critical sectors impacted
• www.tripwire.com: The Medusa ransomware gang continues to present a major threat to the critical infrastructure sector, according to a newly-released joint advisory from the FBI, Cybersecurity and Infrastructure Security Agency (CISA) and the Multi-State Information Sharing and Analysis Center (MS-ISAC).
• : FBI and CISA Warn of Medusa Ransomware Impacting Critical Infrastructure
• bsky.app: CISA says the Medusa ransomware operation has impacted over 300 organizations in critical infrastructure sectors in the United States until last month.
• The DefendOps Diaries: Explore the impact of Medusa ransomware on critical infrastructure and learn strategies to enhance cybersecurity defenses.
• www.scworld.com: Medusa ransomware, a ransomware-as-a-service group, has increased attacks targeting critical infrastructure, potentially preparing for geopolitical conflicts. Recent attacks indicate a 150% increase in this activity.
• Tenable Blog: Tenable article: Cybersecurity Snapshot: Medusa Ransomware Impacting Critical Infrastructure, CISA Warns, While NIST Selects New Quantum-Resistant Algorithm
• SOC Prime Blog: SOC Prime blog: Medusa Ransomware Attacks Covered in AA25-071A Detection
• be4sec: Medusa Ransomware is Targeting Critical Infrastructure
• be4sec: This advisory summarizes the key activities of prominent ransomware groups in January 2025, highlighting a significant increase in Medusa attacks.
• aboutdfir.com: Medusa ransomware group has been actively targeting critical infrastructure organizations, employing a double extortion tactic.
• www.techradar.com: US government warns Medusa ransomware has hit hundreds of critical infrastructure targets
• cyble.com: The FBI and the U.S. Cybersecurity and Infrastructure Security Agency (CISA) issued a well-timed advisory on the Medusa ransomware group last week, as Cyble has detected an acceleration in the group’s activities in recent months.
• Email Security - Blog: Medusa Ransomware: Multi-Industry Threat on the Rise
• techxplore.com: Cybersecurity officials warn against potentially costly Medusa ransomware attacks
• Security | TechRepublic: Medusa Ransomware Strikes 300+ Targets: FBI & CISA Urge Immediate Action to #StopRansomware
• eSecurity Planet: Medusa Ransomware Warning: CISA and FBI Issue Urgent Advisory
• Blue Team Con: CISA and the FBI warn about Medusa ransomware, urging organizations to update security, enable MFA, and report incidents to mitigate the growing threat.
• thecyberexpress.com: Medusa Ransomware Surge: 60 Victims in 3 Months—Are You Next?
• www.zdnet.com: How to guard against a vicious Medusa ransomware attack - before it's too late
• www.cysecurity.news: The Cybersecurity and Infrastructure Security Agency (CISA), in partnership with the FBI and the Multi-State Information Sharing and Analysis Center (MS-ISAC), has issued a #StopRansomware advisory, warning organizations about the increasing threat of Medusa ransomware.
• Sam Bent: Cybercriminal Group Medusa Targets Critical Infrastructure Sectors A sophisticated cybercriminal group known as Medusa has been targeting many critical infrastructure sectors in the United States.
• The Hacker News: Medusa Ransomware Uses Malicious Driver to Disable Anti-Malware with Stolen Certificates
• www.cybersecuritydive.com: Medusa ransomware using malicious driver as EDR killer

Classification:

• HashTags: #MedusaRansomware #RaaS #Cybersecurity
• Target: Various Sectors
• Attacker: Medusa
• Feature: Ransomware
• Malware: Medusa
• Type: Ransomware
• Severity: Disaster