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55 lines
1.9 KiB
Markdown
55 lines
1.9 KiB
Markdown
# API Reference — Hunting for Persistence via WMI Subscriptions
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## Libraries Used
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- **subprocess**: Execute WMIC and PowerShell commands for WMI enumeration
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- **python-evtx** (Evtx): Parse Sysmon EVTX for WMI-related events (IDs 19, 20, 21)
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- **re**: Pattern matching for suspicious WMI consumer payloads
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## CLI Interface
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```
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python agent.py enumerate # WMIC-based WMI subscription enumeration
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python agent.py powershell # PowerShell Get-WMIObject enumeration
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python agent.py sysmon --evtx-file <path> # Scan Sysmon EVTX for WMI events
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```
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## Core Functions
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### `enumerate_wmi_subscriptions()`
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Queries four WMI subscription classes via WMIC and flags entries matching suspicious patterns.
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**Returns:** dict with `classes` (EventFilter, EventConsumer, ActiveScriptEventConsumer, FilterToConsumerBinding) and `suspicious` list.
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### `scan_sysmon_wmi_events(evtx_file)`
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Parses Sysmon EVTX for Event IDs 19 (WmiEventFilter), 20 (WmiEventConsumer), 21 (WmiEventBinding).
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**Parameters:**
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| Name | Type | Description |
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|------|------|-------------|
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| `evtx_file` | str | Path to Sysmon .evtx file |
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### `query_powershell_wmi()`
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Uses PowerShell `Get-WMIObject` to enumerate WMI subscriptions in `root\Subscription` namespace.
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## WMI Classes Enumerated
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| Class | Description |
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|-------|-------------|
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| `__EventFilter` | Defines the WQL query that triggers the subscription |
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| `CommandLineEventConsumer` | Executes a command when the filter matches |
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| `ActiveScriptEventConsumer` | Runs VBScript/JScript when the filter matches |
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| `__FilterToConsumerBinding` | Links a filter to its consumer |
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## Sysmon Event IDs
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| Event ID | Description |
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|----------|-------------|
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| 19 | WmiEvent - Filter activity detected |
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| 20 | WmiEvent - Consumer activity detected |
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| 21 | WmiEvent - Consumer-to-filter binding |
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## Dependencies
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```
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pip install python-evtx # Optional, for EVTX parsing
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```
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