| ID | Name |
|---|---|
| T1542.001 | System Firmware |
| T1542.002 | Component Firmware |
| T1542.003 | Bootkit |
| T1542.004 | ROMMONkit |
| T1542.005 | TFTP Boot |
Adversaries may abuse the ROM Monitor (ROMMON) by loading an unauthorized firmware with adversary code to provide persistent access and manipulate device behavior that is difficult to detect. [1][2]
ROMMON is a Cisco network device firmware that functions as a boot loader, boot image, or boot helper to initialize hardware and software when the platform is powered on or reset. Similar to TFTP Boot, an adversary may upgrade the ROMMON image locally or remotely (for example, through TFTP) with adversary code and restart the device in order to overwrite the existing ROMMON image. This provides adversaries with the means to update the ROMMON to gain persistence on a system in a way that may be difficult to detect.
| ID | Mitigation | Description |
|---|---|---|
| M1047 | Audit |
Periodically check the integrity of system image to ensure it has not been modified. [3] [4] [5] |
| M1046 | Boot Integrity |
Enable secure boot features to validate the digital signature of the boot environment and system image using a special purpose hardware device. If the validation check fails, the device will fail to boot preventing loading of unauthorized software. [6] |
| M1031 | Network Intrusion Prevention |
Network intrusion detection and prevention systems that use network signatures to identify traffic for specific protocols, such as TFTP, can be used to mitigate activity at the network level. Signatures are often for unique indicators within protocols and may be based on the specific technique used by a particular adversary or tool, and will likely be different across various network configurations. |
| ID | Name | Analytic ID | Analytic Description |
|---|---|---|---|
| DET0175 | Detection Strategy for T1542.004 Pre-OS Boot: ROMMONkit | AN0497 |
Detection of anomalous ROMMON image changes or upgrades, unexpected reboots following firmware updates, and unauthorized use of firmware upgrade commands or TFTP transfers. Correlation of config modification, privilege escalation, and boot cycle anomalies provides visibility into ROMMON tampering attempts. |