S0001: Trojan.Mebromi
Trojan.Mebromi is BIOS-level malware that takes control of the victim before MBR. [1]
Analyst context for executives and security teams
Trojan.Mebromi matters because ATT&CK identifies it as Windows BIOS-level malware that can take control before the Master Boot Record. For leaders, the practical issue is not routine malware cleanup; it is whether recovery, forensics, and endpoint controls can account for persistence below the operating system.
Executive priority
Treat this as a firmware-level resilience question. If an incident involves behavior related to System Firmware modification, executives should ask whether the organization can prove affected assets are trustworthy after rebuild, whether IR procedures include firmware validation, and whether compliance evidence covers firmware integrity—not just OS patching and EDR status.
Technical view
ATT&CK links Trojan.Mebromi to T1542.001 System Firmware, associated with stealth and persistence. SOC and IR teams should validate whether Windows endpoint investigations can surface suspicious firmware or boot-chain changes, and whether containment and recovery plans include firmware inspection or restoration before declaring a host clean. Because official detection guidance is not provided, local telemetry and vendor capabilities must determine practical coverage.
Likely telemetry
- Firmware/BIOS or UEFI inventory and version records for Windows assets
- Firmware update, configuration, or integrity events where available
- Endpoint security alerts related to boot-chain, MBR, or firmware integrity anomalies
- Asset management records tying hardware models to expected firmware baselines
- Incident response evidence from forensic acquisition or firmware validation workflows
Detection direction
- Map detection content to T1542.001 System Firmware rather than relying only on commodity malware signatures.
- Validate whether EDR and host logging have visibility before or during early boot; many OS-level tools may have limited visibility into firmware-resident activity.
- Tune investigations around unauthorized firmware changes, unexpected firmware versions, or boot-chain anomalies, while accounting for legitimate firmware updates and maintenance windows.
- Confirm that SOC escalation criteria recognize firmware persistence as a reason normal reimage procedures may be insufficient.
Mitigation priorities
- Maintain authoritative firmware baselines for critical Windows assets.
- Prioritize controlled firmware update and change-management processes so legitimate changes are auditable.
- Ensure IR playbooks include firmware validation or restoration steps before returning affected systems to service.
- Align recovery evidence with audit and compliance needs by documenting how firmware trust was established.
Analyst notes and limits
The supplied ATT&CK object is sparse: Trojan.Mebromi has a short description, Windows platform, one historical external reference, and a relationship to System Firmware modification. The defensive value is in using it to test whether the organization can detect, investigate, and recover from persistence below the operating system.
No official ATT&CK detection text, aliases, labels, or direct tactics are provided for the malware object. Tactics are inferred only from the related T1542.001 technique context. Local platform inventory, firmware tooling, and endpoint telemetry are required to assess real coverage.
Trojan.Mebromi
Trojan.Mebromi is BIOS-level malware that takes control of the victim before MBR. [1]
How security teams should use this page
Treat this object as behavior context, not an attribution claim. Validate the related groups, software, data sources, and mitigations against official ATT&CK relationships and your own telemetry before making control-coverage decisions.
Techniques used
This mirrors the MITRE pattern of making group, software, campaign, and technique relationships scannable. Relationship notes come from mirrored ATT&CK relationship text when available.
| Domain | ID | Name | Relationship / procedure |
|---|---|---|---|
| Enterprise | T1542.001 | System Firmware Sub-technique | Trojan.Mebromi performs BIOS modification and can download and execute a file as well as protect itself from removal.CitationGe 2011 |
All related ATT&CK context
Object version and sync metadata
The fields below describe the current mirrored snapshot. When Glexia retains multiple ATT&CK source imports, you can open the table to compare the same object across releases (hashes and MITRE timestamps). For MITRE’s own release notes and roadmap, see ATT&CK resources — Updates .
Imported snapshots across ATT&CK releases (1)
| Release | Bundle imported | Object version | Modified | Status | Raw hash |
|---|---|---|---|---|---|
| 19.1 | 1.1 | Current bundle | 7f8f281f5fa8… |
Mirrored ATT&CK source object
The raw object is retained through the mirrored ATT&CK source bundle and object hash. The raw endpoint returns the exact object from the mirrored bundle when available.
External references and citations
MITRE external references are preserved separately from Glexia analysis so citations remain traceable to their original source records.
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[1]
Ge 2011
Ge, L. (2011, September 9). BIOS Threat is Showing up Again!. Retrieved November 14, 2014.
Open source URL -
[2]
mitre-attack S0001Open source URL
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