# detecting-wmi-persistence

> Detect WMI event subscription persistence by analyzing Sysmon Event IDs 19, 20, and 21 for malicious EventFilter, EventConsumer, and FilterToConsumerBinding creation.

- Skill: `mukul975/detecting-wmi-persistence` (Agent Skill, multi-file: 4 files)
- Install (CLI): `npx skillmds add mukul975/detecting-wmi-persistence`
- Raw SKILL.md: https://api.skillmd.com/api/skills/mukul975/detecting-wmi-persistence/raw
- Safety review: PASS (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Security, Coding & Dev Tools, Incident Response
- Tags: Event Id 19, Event Id 20, Event Id 21, Persistence, Sysmon, T1546 003, Windows Security, Wmi
- License: Apache-2.0
- Author: mukul975 (https://skillmd.com/u/mukul975)
- Updated: 2026-07-06
- Page: https://skillmd.com/skills/mukul975/detecting-wmi-persistence

---


# 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

| Concept | Description |
|---------|-------------|
| Sysmon Event 19 | WmiEventFilter creation detected |
| Sysmon Event 20 | WmiEventConsumer creation detected |
| Sysmon Event 21 | WmiEventConsumerToFilter binding detected |
| T1546.003 | Event Triggered Execution: WMI Event Subscription |
| CommandLineEventConsumer | Executes system commands when filter triggers |
| ActiveScriptEventConsumer | Runs VBScript/JScript when filter triggers |

## Tools & Systems

| Tool | Purpose |
|------|---------|
| Sysmon | Windows event monitoring for WMI activity |
| WMI Explorer | GUI tool for browsing WMI namespaces |
| Autoruns | Sysinternals tool listing persistence mechanisms |
| PowerShell Get-WMIObject | Enumerate WMI event subscriptions |
| Splunk | SIEM analysis of Sysmon WMI events |
| Velociraptor | Endpoint 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]
```