Detection Strategy for T1542.001 Pre-OS Boot: System Firmware, Detection Strategy DET0099
Excerpt
AN0275
Unexpected write operations to BIOS/UEFI firmware regions or EFI boot partitions that do not correlate with legitimate vendor firmware updates. API calls or utilities such as fwupdate.exe or vendor flash tools executed from non-administrative or non-IT management accounts. Suspicious raw disk writes targeting System Firmware GUID partitions followed by abnormal reboot sequences.
Log Sources
Data Component Name Channel
Process Creation (DC0032) WinEventLog:Security EventCode=4688
Drive Access (DC0054) WinEventLog:Sysmon EventCode=9
File Creation (DC0039) WinEventLog:Sysmon EventCode=11
Mutable Elements
Field Description
AllowedFirmwareUpdateTools…
The opening of the report, shown for reference. The full report, with its figures and indicators, is published by MITRE ATT&CK on attack.mitre.org.
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