CRITICAL ALERT CVE-2026-4011 CVSS 9.1 2 days ago

State-Sponsored Threat Actors Deploy Kernel-Level EDR Killer Drivers Signed with Stolen EV Certificates

By Vikram Dev (Defensive Operations Lead)

          60-SECOND EXECUTIVE TL;DR
        

Adversaries bypass Windows HVCI using Bring-Your-Own-Vulnerable-Driver (BYOVD) tactics to terminate EDR agents.

Compromised Extended Validation (EV) code-signing certs allowed loading obsolete vulnerable kernel drivers.
Silently unhooks CrowdStrike Falcon, SentinelOne, and Microsoft Defender processes within 400ms.
Subsequent ransomware deployment occurs completely undetected by automated behavioral monitoring.

Immediate Mitigation: Enable Microsoft Vulnerable Driver Blocklist in AppLocker and enforce Windows Defender Application Control (WDAC).

A highly disciplined advanced persistent threat (APT) cluster has been observed systematically crippling enterprise Endpoint Detection and Response (EDR) systems across healthcare and banking infrastructure. Using Bring-Your-Own-Vulnerable-Driver (BYOVD) techniques, attackers drop legitimately signed historical drivers that possess kernel memory write privileges, zeroing out EDR hook tables before security operations centers can react. ### BlueCiphr 24x7 SOC Response BlueCiphr MDR teams monitor out-of-band kernel telemetry and hardware performance counters to detect driver load anomalies before userland agents can be suppressed.

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