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Copy file name to clipboardExpand all lines: defender-endpoint/detect-block-potentially-unwanted-apps-microsoft-defender-antivirus.md
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ms.author: ewalsh
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ms.custom: nextgen
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audience: ITPro
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ms.reviewer: mimilone, julih
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ms.reviewer: yongrhee, mimilone, julih
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manager: deniseb
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ms.subservice: ngp
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ms.topic: conceptual
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- tier2
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- mde-ngp
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search.appverid: met150
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ms.date: 05/17/2024
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ms.date: 03/04/2025
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---
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# Detect and block potentially unwanted applications
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Microsoft Defender Antivirus is available in the following editions/versions of Windows and Windows Server:
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- Windows Server 2025
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- Windows Server 2022
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- Windows Server 2019
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- Windows Server, version 1803 or later
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3. Under the **Security** section, turn on **Block potentially unwanted apps**.
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> [!TIP]
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> If you are running Microsoft Edge (Chromium-based), you can safely explore the URL-blocking feature of PUA protection by testing it out on one of our [Microsoft Defender SmartScreen demo pages](https://demo.smartscreen.msft.net/).
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> If you're running Microsoft Edge (Chromium-based), you can safely explore the URL-blocking feature of PUA protection by testing it out on one of our [Microsoft Defender SmartScreen demo pages](https://demo.smartscreen.msft.net/).
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### Block URLs with Microsoft Defender SmartScreen
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In Chromium-based Microsoft Edge with PUA protection turned on, Microsoft Defender SmartScreen protects you from PUA-associated URLs.
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Security admins can [configure](/DeployEdge/configure-microsoft-edge) how Microsoft Edge and Microsoft Defender SmartScreen work together to protect groups of users from PUA-associated URLs. There are several [group policy settings](/DeployEdge/microsoft-edge-policies#smartscreen-settings) explicitly for Microsoft Defender SmartScreen available, including [one for blocking PUA](/DeployEdge/microsoft-edge-policies#smartscreenpuaenabled). In addition, admins can [configure Microsoft Defender SmartScreen](/microsoft-edge/deploy/available-policies?source=docs#configure-windows-defender-smartscreen) as a whole, using group policy settings to turn Microsoft Defender SmartScreen on or off.
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Security administrators can [configure](/DeployEdge/configure-microsoft-edge) how Microsoft Edge and Microsoft Defender SmartScreen work together to protect groups of users from PUA-associated URLs. There are several [group policy settings](/DeployEdge/microsoft-edge-policies#smartscreen-settings) explicitly for Microsoft Defender SmartScreen available, including [one for blocking PUA](/DeployEdge/microsoft-edge-policies#smartscreenpuaenabled). In addition, admins can [configure Microsoft Defender SmartScreen](/microsoft-edge/deploy/available-policies?source=docs#configure-windows-defender-smartscreen) as a whole, using group policy settings to turn Microsoft Defender SmartScreen on or off.
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Although Microsoft Defender for Endpoint has its own blocklist based upon a data set managed by Microsoft, you can customize this list based on your own threat intelligence. If you [create and manage indicators](indicators-overview.md) in the Microsoft Defender for Endpoint portal, Microsoft Defender SmartScreen respects the new settings.
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## Microsoft Defender Antivirus and PUA protection
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The potentially unwanted application (PUA) protection feature in Microsoft Defender Antivirus can detect and block PUA on endpoints in your network.
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Microsoft Defender Antivirus blocks detected PUA files and any attempts to download, move, run, or install them. Blocked PUA files are then moved to quarantine. When a PUA file is detected on an endpoint, Microsoft Defender Antivirus sends a notification to the user ([unless notifications have been disabled](configure-notifications-microsoft-defender-antivirus.md) in the same format as other threat detections. The notification is prefaced with `PUA:` to indicate its content.
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Microsoft Defender Antivirus blocks detected PUA files and any attempts to download, move, run, or install them. Blocked PUA files are then moved to quarantine. When a PUA file is detected on an endpoint, Microsoft Defender Antivirus sends a notification to the user ([unless notifications are disabled](configure-notifications-microsoft-defender-antivirus.md) in the same format as other threat detections. The notification is prefaced with `PUA:` to indicate its content.
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The notification appears in the usual [quarantine list within the Windows Security app](microsoft-defender-security-center-antivirus.md).
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PUA protection is enabled by default in the Microsoft Configuration Manager (Current Branch).
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See [How to create and deploy antimalware policies: Scheduled scans settings](/configmgr/protect/deploy-use/endpoint-antimalware-policies#real-time-protection-settings) for details on configuring Microsoft Configuration Manager (Current Branch).
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See [How to create and deploy anti-malware policies: Scheduled scans settings](/configmgr/protect/deploy-use/endpoint-antimalware-policies#real-time-protection-settings) for details on configuring Microsoft Configuration Manager (Current Branch).
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For System Center 2012 Configuration Manager, see [How to Deploy Potentially Unwanted Application Protection Policy for Endpoint Protection in Configuration Manager](/previous-versions/system-center/system-center-2012-R2/hh508770(v=technet.10)#BKMK_PUA).
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Set-MpPreference -PUAProtection Enabled
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```
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Setting the value for this cmdlet to `Enabled` turns on the feature if it has been disabled.
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Setting the value for this cmdlet to `Enabled` turns on the feature if it is disabled.
Setting the value for this cmdlet to `Disabled` turns off the feature if it has been enabled.
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#### To query the PUA status
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```powershell
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get-mpPreference | ft PUAProtection
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```
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|Value | Description|
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| -------- | -------- |
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|`0`| PUA Protection off (Default). Microsoft Defender Antivirus won't protect against potentially unwanted applications. |
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|`1`| PUA Protection on. Detected items are blocked. They will show in history along with other threats.|
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|`2`| Audit mode. Microsoft Defender Antivirus will detect potentially unwanted applications but take no action. You can review information about the applications Windows Defender would've taken action against by searching for events created by Windows Defender in the Event Viewer.|
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For more information, see [Use PowerShell cmdlets to configure and run Microsoft Defender Antivirus](use-powershell-cmdlets-microsoft-defender-antivirus.md) and [Defender Antivirus cmdlets](/powershell/module/defender/index).
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## Test and make sure that PUA blocking works
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For more information, see [Configure and validate exclusions based on file extension and folder location](configure-extension-file-exclusions-microsoft-defender-antivirus.md).
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> [!TIP]
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> If you're looking for Antivirus related information for other platforms, see:
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> -[Microsoft Defender for Endpoint on Mac](microsoft-defender-endpoint-mac.md)
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> -[Microsoft Defender for Endpoint on Linux](microsoft-defender-endpoint-linux.md)
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> -[Configure Defender for Endpoint on Android features](android-configure.md)
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> -[Configure Microsoft Defender for Endpoint on iOS features](ios-configure-features.md)
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