Uefi-Bootkit · CuraSec

tag: Uefi-Bootkit · 2 items

Engineer — Plan: Baton Drop is described as an old flaw, meaning patches exist — audit UEFI firmware versions and apply Secure Boot DBX revocation list updates across physical and bare-metal hosts to block this bypass class.
SOC/IR — Plan: UEFI bootkits load before the OS and actively interfere with EDR agents; build or review detection coverage for anomalous driver loads at early boot and Secure Boot policy tampering, and consider whether firmware integrity monitoring is in scope.
Leader — Learn: A nation-state espionage campaign deploying UEFI-level persistence that defeats endpoint security tools is a useful data point for risk conversations, but no vendor breach or immediate organizational action is indicated without sector-specific targeting context.

Engineer — Plan: The bypass exploits outdated UEFI Secure Boot revocation databases (DBX) rather than an unpatched flaw — audit all Windows endpoints and servers to confirm DBX revocation lists are current, and verify that UEFI firmware update policies include revocation database refresh.
SOC/IR — Plan: APT41’s deployment of a new UEFI-level bootkit warrants reviewing Kaspersky’s technical report for IOCs and ATT&CK mappings, then building or tuning detections for Secure Boot bypass behaviors (e.g., unexpected bootloader measurements, DBX modification events) in EDR and firmware telemetry.
Leader — Learn: A China-nexus group’s use of firmware-level persistence against diplomatic targets is a useful data point for risk posture discussions, but the campaign’s narrow targeting of Central Asian diplomatic entities means no immediate board-level action is required for most organizations.