Qilin’s “EDR Killer” Dismantles 300+ Security Drivers

Cisco Talos provides a technical deep-dive into a sophisticated "EDR killer" DLL (msimg32.dll) used in Qilin ransomware attacks; the malware sideloads or is dropped on victims, suppresses telemetry, manipulates kernel callbacks (including overwriting CiValidateImageHeader), bypasses security hooks via SEH/VEH and system call techniques, and restores pointers afterward to reduce detection — underscoring the need for multi-layered defenses beyond single-product EDR solutions.