Driver-Based Ransomware Tactics
The Medusa ransomware group is leveraging a malicious driver, dubbed ABYSSWORKER, in a “bring your own vulnerable driver” (BYOVD) attack to disable endpoint detection and response (EDR) systems. Delivered via a loader packed using the HeartCrypt packer-as-a-service, the driver—smuol.sys—mimics a legitimate CrowdStrike Falcon component and is signed with revoked or stolen certificates from Chinese vendors. […]
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