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detecting-wmi-persistence

Detect WMI event subscription persistence (MITRE T1546.003) by analyzing Sysmon Event IDs 19, 20, and 21 for malicious EventFilter, EventConsumer, and FilterToConsumerBinding creation, cross-referenced against root\subscription namespace contents and Sysinternals Autoruns. Use when hunting WMI-based persistence, triaging a Sysmon alert on these event IDs, or during incident response and purple-team validation of WMI defenses.

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含まれるファイル(4)

  • SKILL.md3.6 KB
  • LICENSE11.0 KB
  • references/api-reference.md2.9 KB
  • scripts/agent.py8.7 KB

SKILL.md(原文)

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Detecting WMI Persistence

When to Use

  • When hunting for WMI event subscription persistence (MITRE ATT&CK T1546.003)
  • After detecting suspicious WMI activity in endpoint telemetry
  • During incident response to identify attacker persistence mechanisms
  • When Sysmon alerts trigger on Event IDs 19, 20, or 21
  • During purple team exercises testing WMI-based persistence

Prerequisites

  • Sysmon v6.1+ deployed with WMI event logging enabled (Event IDs 19, 20, 21)
  • Windows Security Event Log forwarding configured
  • SIEM with Sysmon data ingested (Splunk, Elastic, Sentinel)
  • PowerShell access for WMI enumeration on endpoints
  • Sysinternals Autoruns for manual WMI subscription review

Workflow

  1. Collect Telemetry: Parse Sysmon Event IDs 19 (WmiEventFilter), 20 (WmiEventConsumer), 21 (WmiEventConsumerToFilter).
  2. Identify Suspicious Consumers: Flag CommandLineEventConsumer and ActiveScriptEventConsumer types executing code.
  3. Analyze Event Filters: Examine WQL queries in EventFilters for process start triggers or timer-based execution.
  4. Correlate Bindings: Match FilterToConsumerBindings linking suspicious filters to consumers.
  5. Check Persistence Locations: Query WMI namespaces root\subscription and root\default for active subscriptions.
  6. Validate Findings: Cross-reference with known-good WMI subscriptions (SCCM, AV products).
  7. Document and Remediate: Remove malicious subscriptions and update detection rules.

Key Concepts

ConceptDescription
Sysmon Event 19WmiEventFilter creation detected
Sysmon Event 20WmiEventConsumer creation detected
Sysmon Event 21WmiEventConsumerToFilter binding detected
T1546.003Event Triggered Execution: WMI Event Subscription
CommandLineEventConsumerExecutes system commands when filter triggers
ActiveScriptEventConsumerRuns VBScript/JScript when filter triggers

Tools & Systems

ToolPurpose
SysmonWindows event monitoring for WMI activity
WMI ExplorerGUI tool for browsing WMI namespaces
AutorunsSysinternals tool listing persistence mechanisms
PowerShell Get-WMIObjectEnumerate WMI event subscriptions
SplunkSIEM analysis of Sysmon WMI events
VelociraptorEndpoint WMI artifact collection

Output Format

Hunt ID: TH-WMI-[DATE]-[SEQ]
Technique: T1546.003
Host: [Hostname]
Event Type: [EventFilter|EventConsumer|Binding]
Consumer Type: [CommandLine|ActiveScript]
WQL Query: [Filter query text]
Command: [Executed command or script]
Risk Level: [Critical/High/Medium/Low]
Recommended Action: [Remove subscription, investigate lateral movement]

レビュー

まだレビューはありません。使ってみた感想をお寄せください。

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