TA0040 · IMPACT
Firmware Corruption
Adversaries may overwrite or corrupt the flash memory contents of system BIOS or other firmware in devices attached to a system in order to render them inoperable or unable to boot, thus denying the availability to use the devices and/or the system.
Detect it with
System firmware manipulation may be detected. Log attempts to read/write to BIOS and compare against known patching behavior.
Why it matters on shift
Firmware Corruption is one of the concrete ways adversaries achieve impact. Recognising it in telemetry lets you name the technique in your ticket and pivot to what came before and after.
What to look for next
After impact, the next tactic is usually Impact. Search your telemetry for the transition before closing the ticket.
Kill-chain context