Elastic Security Detection Rules

Mofcomp Activity

Last updated 10 months ago on 2025-02-21
Created 2 years ago on 2023-08-23

About

Managed Object Format (MOF) files can be compiled locally or remotely through mofcomp.exe. Attackers may leverage MOF files to build their own namespaces and classes into the Windows Management Instrumentation (WMI) repository, or establish persistence using WMI Event Subscription.
Tags
Domain: EndpointOS: WindowsUse Case: Threat DetectionTactic: ExecutionData Source: Elastic DefendData Source: Microsoft Defender for EndpointData Source: Elastic EndgameData Source: Windows Security Event LogsData Source: CrowdstrikeLanguage: eql
Severity
low
Risk Score
21
MITRE ATT&CK™

Execution (TA0002)(external, opens in a new tab or window)

↳ Windows Management Instrumentation (T1047)(external, opens in a new tab or window)

Persistence (TA0003)(external, opens in a new tab or window)

↳ Event Triggered Execution (T1546)(external, opens in a new tab or window)

License
Elastic License v2(external, opens in a new tab or window)

Definition

Rule Type
Event Correlation Rule
Integration Pack
Prebuilt Security Detection Rules
Index Patterns
endgame-*logs-crowdstrike.fdr*logs-endpoint.events.process-*logs-m365_defender.event-*logs-system.security*
Related Integrations

endpoint(external, opens in a new tab or window)

m365_defender(external, opens in a new tab or window)

system(external, opens in a new tab or window)

crowdstrike(external, opens in a new tab or window)

Query
text code block:
process where host.os.type == "windows" and event.type == "start" and
  process.name : "mofcomp.exe" and process.args : "*.mof" and
  not user.id : "S-1-5-18" and
  not
  (
    process.parent.name : "ScenarioEngine.exe" and
    process.args : (
      "*\\MSSQL\\Binn\\*.mof",
      "*\\Microsoft SQL Server\\???\\Shared\\*.mof",
      "*\\OLAP\\bin\\*.mof"
    )
  )

Install detection rules in Elastic Security

Detect Mofcomp Activity in the Elastic Security detection engine by installing this rule into your Elastic Stack.

To setup this rule, check out the installation guide for Prebuilt Security Detection Rules(external, opens in a new tab or window).