US Authorities have shared a joint Cybersecurity Advisory (CSA) is part of an ongoing #StopRansomware effort to publish advisories for network defenders that detail various ransomware variants and ransomware threat actors. #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.
This joint CSA shares known IOCs, TTPs, and detection methods associated with the AvosLocker variant identified through FBI investigations as recently as May 2023. AvosLocker operates under a ransomware-as-a-service (RaaS) model. AvosLocker affiliates have compromised organizations across multiple critical infrastructure sectors in the US, affecting Windows, Linux, and VMware ESXi environments. AvosLocker affiliates compromise organizations’ networks by using legitimate software and open-source remote system administration tools. AvosLocker affiliates then use exfiltration-based data extortion tactics with threats of leaking and/or publishing stolen data.
This joint advisory updates a 17 March 2022, AvosLocker ransomware joint CSA, Indicators of Compromise associated with AvosLocker ransomware. This update includes IOCs and TTPs not included in the previous advisory and a YARA rule FBI developed after analyzing a tool associated with an AvosLocker compromise.
Link to full report: https://www.cisa.gov/news-events/cybersecurity-advisories/aa23-284a
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