Defender Power Control Module

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  1. Power Control Module Wikipedia
Contents of this article
  • Managing preferences
  • Threats
  • Updating definitions
  • Scanning
  • Using with CIM

With the release of the Windows 10 Anniversary Update, Microsoft has improved their antivirus (AV) solution by adding features, including the ability to perform offline scans, cloud integration, and enhanced notifications as noted here. One advantage of Windows Defender over third-party AV products is Defender's built-in PowerShell support.

Running Get-Command -Module Defender shows the cmdlets you can use to work with Defender. Essentially, you can manage preferences, threats, definitions, scans, and get the current status of Windows Defender.

Windows Defender PowerShell cmdlets

Managing preferences ^

The cmdlets Add-MpPreference, Get-MpPreference, Remove-MpPreference, and Set-MpPreference allow you configure the Windows Defender preferences. For instance, you can use Add-MpPreference to exclude an extension, path, or process from virus scans.

In the example below, I will add the paths 'C:UsersDanTest' and 'C:WindowsAVTest' as scan exclusions.

1PSC:>Set-MpPreference-UILockdown:$True-ExclusionProcess test‑ScanAvgCPULoadFactor20‑RemediationScheduleDay Sunday‑RemediationScheduleTime120

Threats ^

The Defender PowerShell module can detect, view, and remove active threats, view the threat history, and view threats listed in the definitions catalog. Below, I have attempted to download the EICAR test file to my computer with Google Chrome. Using Get-MpThreatDetection, I can view the action taken against the threat, the user account this occurred under, the detection time, the remediation time, and the action taken.

123456789PSC:>Get-MpThreatCatalog Where-Object{$_.ThreatName-like'*Harnig.X*'}CategoryID:4SeverityID:5ThreatID:26276ThreatName:TrojanDownloader:Win32/Harnig.XTypeID:Power control module honda0PSComputerName:

Updating definitions ^

The Update-MpSignature cmdlet uses an update source (by default the Microsoft Update Server) to download the most recent definitions. You can also choose a difference source via the -UpdateSource parameter to specify an internal definition server, the Microsoft Malware Protection Center (MMPC), or a file share.

Scanning ^

As previously stated, in addition to the traditional quick and full scan options, Windows Defender now also allows performing an offline scan. An offline scan restarts your computer and begins scanning outside of the Windows kernel with the intention of finding viruses and rootkits that can infect the master boot record.

To start an offline scan, you can run Start-MpWSOScan.

1PSC:>Get-MpThreatDetection-CimSession test-1,test-2-ThreatID2147519003 Where-Object{$_.InitialDetectionTime-gt(Get-Date).AddDays(-1)} Select-ObjectPSComputerName,ProcessName

In this scenario, I would like to start a full scan on all computers in a particular Active Directory organizational unit, in this case 'Win10.' To accomplish this, I can use Get-ADComputer and use the-SearchBase parameter.