#StopRansomware: Interlock

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Cybersecurity Advisory #StopRansomware: Interlock Release Date July 22, 2025 Alert Code aa25-203a CISA Product Feedback Survey Related topics: Malware, Phishing, and Ransomware , Cyber Threats and Response Actions for Organizations to Take Today to Mitigate Cyber Threats Related to Interlock Ransomware Activity Prevent initial access by implementing domain name system (DNS) filtering and web access firewalls, and training users to spot social engineering attempts. Mitigate known vulnerabilities by ensuring operating systems, software, and firmware are patched and up to date. Segment networks to restrict lateral movement from initial infected devices and other devices in the same organization. Implement identity, credential, and access management (ICAM) policies across the organization and then require multifactor authentication (MFA) for all services to the extent possible. Summary Note : This joint Cybersecurity Advisory is part of an ongoing #StopRansomware effort to publish advisories for network defenders that detail various ransomware variants and ransomware threat actors. These #StopRansomware advisories include recently and historically observed tactics, techniques, and procedures (TTPs) and indicators of compromise (IOCs) to help organizations protect against ransomware. Visit stopransomware.gov to see all #StopRansomware advisories and to learn more about other ransomware threats and no-cost resources. The Federal Bureau of Investigation (FBI), Cybersecurity and Infrastructure Security Agency (CISA), Department of Health and Human Services (HHS), and Multi-State Information Sharing and Analysis Center (MS-ISAC)—hereafter referred to as “the authoring organizations”—are releasing this joint advisory to disseminate known Interlock ransomware IOCs and TTPs identif