TA0003 · PERSISTENCE
TFTP Boot
Adversaries may abuse netbooting to load an unauthorized network device operating system from a Trivial File Transfer Protocol (TFTP) server.
Detect it with
Consider comparing a copy of the network device configuration and system image against a known-good version to discover unauthorized changes to system boot, startup configuration, or the running OS.
Why it matters on shift
TFTP Boot is one of the concrete ways adversaries achieve persistence. 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 persistence, the next tactic is usually Privilege Escalation. Search your telemetry for the transition before closing the ticket.
Kill-chain context