# Monitor PowerShell hosts with WMI

This snippet alerts whenever a PowerShell host process is started; the detection technique is the same one discussed in [Query PowerShell alternative hosts with WMI](/red-teaming/notes/powershell/powershell-snippets/query-powershell-alternative-hosts-with-wmi.md) and [Alternate PowerShell Hosts](/red-teaming/notes/powershell/alternate-powershell-hosts.md).

```powershell
$EventName = 'PowerShellHostProcessWatcher'

Register-CimIndicationEvent -Query "SELECT FileName, ProcessID FROM Win32_ModuleLoadTrace WHERE FileName LIKE '%System.Management.Automation%'" -Action {

    Write-Host @"
PowerShell host process loaded!
Process ID: $($EventArgs.NewEvent.ProcessID)
File path:  $($EventArgs.NewEvent.FileName)
"@

    Unregister-Event -SourceIdentifier $EventSubscriber.SourceIdentifier
} -SourceIdentifier $EventName
```

References:

* [WMI - Windows Management Instrumentation](/red-teaming/notes/powershell/wmi-windows-management-instrumentation.md)


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