T1693 Modify Firmware

Firmware is low-level software embedded in hardware that enables systems and devices to function properly and is commonly found in ICS environments. Adversaries may modify firmware on a system or device by installing malicious or vulnerable versions that enable them to achieve objectives such as Persistence, Impair Process Control, and Inhibit Response Function. Adversaries may modify system and device firmware by using the built-in firmware update functionality which may support local or remote installation. The malicious or vulnerable firmware may be delivered via Replication Through Removable Media, Supply Chain Compromise, or Remote Services. Once installed, the malicious or vulnerable firmware could be used to provide Rootkit and Hooking functionality, Exploitation for Privilege Escalation, or Denial of Service.