Suspicious MsMpEng Execution from Non-Standard Directory

ATT&CK techniques

Execution → Defense Evasion

Recon
Resource Dev
Initial Access
Execution
- T1574.001DLL
Persistence
- T1574.001DLL
Priv Esc
- T1574.001DLL
Defense Evasion
- T1036.005Match Legitimate Resource Name or Location
- T1574.001DLL
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects the Microsoft Defender engine binary MsMpEng.exe running from a directory outside its trusted install paths which indicates an infostealer masquerading as a security process to blend in. The legitimate MsMpEng only executes from the Defender platform directory so any other location is highly suspicious.

Reporting behind it

Related detections9 linkedT1574.001 — drag to rearrange

Suspicious Svchost Execution from Non-System Path

Windows ImageLoad of Unsigned .node Native Add-on Files

Suspicious WerFault Masquerade Executing From Non-System Path Linked to Turla Snake

Malicious DLL Side-Loading by 3CX Desktop Application (via image_load)

Suspicious printfilterpipelinesvc.exe Executed from Non-System Path (via process_creation)

Malicious easinvoker.exe DLL Hijack from Public Libraries (via process_creation)

Malicious NsBars.dll Side-Loaded by Textoescritor.exe (via image_load)

Malicious WindowsCodecs.dll Side-Loaded by calc.exe (via image_load)

Malicious version.dll Side-Loaded by explorer.exe (via image_load)

Suspicious MsMpEng Execution from Non-Standard Directory

Pivot detection · T1574.001 · 9 related

Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.

Full detection rule

Unlock this rule to view and copy it

The detection logic is included with a plan. Everything else — context, mappings and implementation details — stays free on this page.

Sign in for 3 free unlocks

Signing in gives you 3 unlocks to spend on any rule in the library. No card, and they do not expire.

Also included

Unlocked rules convert on this page — to Splunk SPL or Splunk — Raw Index SPL or Microsoft Sentinel KQL or Microsoft Sentinel ASIM ASIM KQL or Microsoft Defender XDR KQL or Elastic Security KQL or Elastic Security Lucene or Elastic Security ES|QL or CrowdStrike Falcon CQL or SentinelOne PowerQuery or Palo Alto Cortex XDR XQL or Carbon Black Cloud Platform Search or Carbon Black EDR Process Search or Google Security Operations UDM Search or IBM QRadar AQL or Sumo Logic Cloud SIEM Rules expression or Rapid7 InsightIDR LEQL or Graylog Search or OpenSearch Lucene or OpenSearch PPL PPL or Grafana Loki LogQL or SQLite SQL or Zircolite SQLite — with the log-source profile the engine picked, the field map it used, and everything it could not express. Converting a rule you have unlocked costs no further credit.

See it run on a free rule →Convert your own rule →