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hunting-wmi-event-subscription-persistence

Hunts for malicious WMI permanent event subscription persistence by correlating __EventFilter, CommandLineEventConsumer/ActiveScriptEventConsumer, and FilterToConsumerBinding records from Sysmon Event IDs 19/20/21 or WMI repository exports. Activates for requests to hunt WMI persistence, detect event consumer backdoors, or analyze WMI subscription telemetry.

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查看安装方法

包含的文件(4)

  • SKILL.md2.8 KB
  • LICENSE340 B
  • references/api-reference.md1.1 KB
  • scripts/analyst.py2.9 KB

SKILL.md(原文)

安装前可以查看交给 AI 代理的指令内容。

Hunting WMI Event Subscription Persistence

When to Use

  • You have Sysmon WMI telemetry (Event ID 19 filter, 20 consumer, 21 binding) or a WMI repository export and want to find malicious permanent event subscriptions.
  • You are investigating fileless persistence that survives reboots via WMI.

Do not use this for transient WMI process calls (T1047 execution) — this targets persistent __EventFilter/__EventConsumer subscriptions specifically.

Prerequisites

  • Sysmon EID 19/20/21 events (CSV/JSON) or an exported subscription listing.

Workflow

Step 1: Parse and correlate triad records

python scripts/analyst.py hunt wmi_events.csv

Groups filters, consumers, and bindings, and flags consumers whose payload is suspicious (CommandLineEventConsumer running scripts/encoded commands, ActiveScriptEventConsumer with inline VBScript/JScript).

Step 2: Assess the trigger

Inspect the __EventFilter query — common malicious triggers fire on logon, time intervals (__InstanceModificationEvent within), or process start.

Step 3: Confirm maliciousness

Legitimate management subscriptions exist; weight inline scripts, encoded commands, and unusual consumer names.

Step 4: Operationalize

Write a Sigma/EDR rule for new ActiveScript/CommandLine consumers.

Validation

  • Filter, consumer, and binding are correlated into a complete subscription where possible.
  • Suspicious consumers are flagged by payload content, not consumer existence alone.
  • Findings map to ATT&CK T1546.003.

Pitfalls

  • Legitimate monitoring tools (SCCM, antivirus) create subscriptions — corroborate.
  • Missing the binding that links an otherwise-benign-looking filter and consumer.
  • Encoded PowerShell inside a consumer obscuring intent.

References

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