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MediumSplunk security contentRaven Tait +1

Windows Suspicious File in EFI Volume

Detects data files in the EFI volume. This is sometimes indicative of an actor attempting to bypass secure boot through vulnerabilities such as CVE-2024-7344. These use vulnerable boot loaders to run malicious system…

Description

Detects data files in the EFI volume. This is sometimes indicative of an actor attempting to bypass secure boot through vulnerabilities such as CVE-2024-7344. These use vulnerable boot loaders to run malicious system firmware code.

Detection logic

Detection requirements

Platform
ContainersESXiIaaSLinuxmacOSNetwork DevicesWindows

The rule states no platform. This is derived from the 2 ATT&CK techniques it maps to.

Log source category
sysmon_eventid_11

Known benign triggers

  • Some legitimate system or firmware update processes may create or modify files in the EFI volume. Review alerts carefully to distinguish between normal maintenance and suspicious activity.

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