sigma-rules/rules/windows/execution_mofcomp.toml

[metadata]
creation_date = "2023/08/23"
integration = ["endpoint"]
maturity = "production"
updated_date = "2024/05/21"

[rule]
author = ["Elastic"]
description = """
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.
"""
from = "now-9m"
index = ["logs-endpoint.events.process-*"]
language = "eql"
license = "Elastic License v2"
name = "Mofcomp Activity"
risk_score = 21
rule_id = "210d4430-b371-470e-b879-80b7182aa75e"
severity = "low"
tags = [
    "Domain: Endpoint",
    "OS: Windows",
    "Use Case: Threat Detection",
    "Tactic: Execution",
    "Data Source: Elastic Defend",
]
timestamp_override = "event.ingested"
type = "eql"

query = '''
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"
    )
  )
'''


[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1047"
name = "Windows Management Instrumentation"
reference = "https://attack.mitre.org/techniques/T1047/"


[rule.threat.tactic]
id = "TA0002"
name = "Execution"
reference = "https://attack.mitre.org/tactics/TA0002/"
[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1546"
name = "Event Triggered Execution"
reference = "https://attack.mitre.org/techniques/T1546/"
[[rule.threat.technique.subtechnique]]
id = "T1546.003"
name = "Windows Management Instrumentation Event Subscription"
reference = "https://attack.mitre.org/techniques/T1546/003/"



[rule.threat.tactic]
id = "TA0003"
name = "Persistence"
reference = "https://attack.mitre.org/tactics/TA0003/"