Techniques › T1542 › T1542.001
T1542.001 System Firmware
stealth · persistence — Network Devices, Windows · attack.mitre.org · JSON
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MITRE detection strategy
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analytics
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Sigma rules tagged attack.t1542.001
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KEV CVEs mapped here
<p>Adversaries may modify system firmware to persist on systems.The BIOS (Basic Input/Output System) and The Unified Extensible Firmware Interface (UEFI) or Extensible Firmware Interface (EFI) are examples of system firmware that operate as the software interface between the operating system and hardware of a computer.</p><p>System firmware like BIOS and (U)EFI underly the functionality of a computer and may be modified by an adversary to perform or assist in malicious activity. Capabilities exist to overwrite the system firmware, which may give sophisticated adversaries a means to install malicious firmware updates as a means of persistence on a system that may be difficult to detect.</p>
KEV CVEs mapped to this technique · CTID Mappings Explorer
None. No KEV entry in the public mapping names this technique. Given that 74.7% of KEV has no mapping at all, this says more about the mapping than about the technique.
Detection strategy · ATT&CK Enterprise v19.2
- DET0099 Detection Strategy for T1542.001 Pre-OS Boot: System Firmware v1.0
AN0275 WindowsUnexpected write operations to BIOS/UEFI firmware regions or EFI boot partitions that do not correlate with legitimate vendor firmware updates. API calls or utilities such as fwupdate.exe or vendor flash tools executed from non-administrative or non-IT management accounts. Suspicious raw disk writes targeting System Firmware GUID partitions followed by abnormal reboot sequences.Tunable:
AllowedFirmwareUpdateToolsTimeWindowKnownGoodFirmwareHashesAN0276 Network DevicesUnauthorized firmware uploads to routers, switches, or firewalls via TFTP/FTP/SCP. Logs showing boot variable or startup image path changes redirecting to non-standard firmware images. Abnormal reboots or firmware rollback attempts following configuration modification events.networkdevice:configBoot image path or firmware configuration variable modified outside of maintenance windows→ DC0004 Firmware ModificationTunable:ApprovedFirmwareHashesMaintenanceWindowsSourceIPWhitelist
Sigma rules · SigmaHQ da9bb07d64, tag attack.t1542.001
Author: Nasreddine Bencherchali (Nextron Systems)
· 2022-07-18 · logsource: product=windows category=process_creation · 4abc0ec4-db5a-412f-9632-26659cddf145
Detects execution of the binary "wpbbin" which is used as part of the UEFI based persistence method described in the reference section
Author: Nasreddine Bencherchali (Nextron Systems)
· 2022-07-18 · logsource: product=windows category=file_event · e94b9ddc-eec5-4bb8-8a58-b9dc5f4e185f
Detects creation of a file named "wpbbin" in the "%systemroot%\system32\" directory. Which could be indicative of UEFI based persistence method