REYNOLDS RANSOMWARE EMBEDS BYOVD DRIVER TO DISABLE EDR SECURITY TOOLS

Summary from the TLDR InfoSec newsletter

Reynolds ransomware bundles a vulnerable NsecSoft NSecKrnl driver (CVE-2025-68947, CVSS 5.7) directly in its payload to terminate EDR processes from CrowdStrike, Sophos, Symantec, Palo Alto Cortex XDR, and Avast before encrypting files, eliminating the need for a separate BYOVD deployment step. Symantec and Carbon Black researchers noted a suspicious side-loaded loader on the target network weeks before ransomware execution, followed by deployment of the GotoHTTP remote access tool for persistent access. The article also covers broader ransomware developments, including LockBit 5.0's shift to ChaCha20 encryption with wiper capabilities, Interlock's use of a gaming driver zero-day (CVE-2025-61155) for BYOVD attacks, and ransomware actors increasingly targeting misconfigured AWS S3 buckets.