tfMITRE ATT&CK sub-technique

ROMMONkit T1542.004

Tactics: Persistence, Stealth
Platform: Network Devices
Version: 2.0
Created: 20 October 2020
Last modified: 12 May 2026

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]

ReconResource DevInitial AccessExecutionPersistencePriv EscStealthDef ImpairmentCred AccessDiscoveryLateral MoveCollectionC2ExfiltrationImpact

Threat groupsNone recorded

Threat groupsNone recorded · 29% of ATT&CK techniques have none either.

CampaignsNone recorded

CampaignsNone recorded · 54% of ATT&CK techniques have none either.

Tools & malwareNone recorded

Tools & malwareNone recorded · 29% of ATT&CK techniques have none either.

Detection rulesNone recorded

Detection rulesNone recorded · 33% of ATT&CK techniques have none either.

Offense vs defense T1542.004

Is defensive coverage keeping up with adversary use? Eight counts, each ranked against all 697 ATT&CK techniques. Attack sits left, defense right, so a shape leaning left means adversaries are better documented here than defenders are equipped. Hover any spoke for its percentile and the share of techniques that have more. The timeline below shows when each side arrived.

ROMMONkit detection strategy DET0175

MITRE names one behaviour worth catching for this technique and breaks it into 1 analytic, one per platform. Each carries the log sources it needs and the fields you tune per environment.

Detection Strategy for T1542.004 Pre-OS Boot: ROMMONkit

Enterprise

1 platform

AN0497 · Network Devices

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.

Log sources

The data this analytic draws on. You do not need every component — each one you already collect covers part of it. Each links to its ATT&CK record.

Data component	Name	Channel
Firmware ModificationDC0004	networkdevice:config	Log entries indicating ROMMON image upgrade commands (boot system, upgrade rom-monitor)
OS API ExecutionDC0021	networkdevice:syslog	Unexpected reload, crashinfo, or boot message not tied to scheduled maintenance
Network Connection CreationDC0082	NSM:Flow	Outbound or inbound TFTP file transfers of ROMMON or firmware binaries

Tunable fields

MITRE calls these the analytic’s mutable elements: the thresholds and filters you set for your own environment.

Field	What you tune
ApprovedROMMONVersions	Baseline ROMMON image versions authorized for the environment
TimeWindow	Correlation window between ROMMON update command, TFTP file transfer, and device reboot
AdminUserContext	Expected privileged accounts allowed to execute ROMMON upgrade commands

ROMMONkit detections T1542.004

No detection rules are mapped to this technique yet.

None recorded— 33% of ATT&CK techniques have none either

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