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defender-endpoint/attack-surface-reduction-rules-reference.md

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- m365-security
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- tier2
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- mde-asr
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ms.date: 11/05/2024
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ms.date: 11/10/2024
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search.appverid: met150
2020
---
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Dependencies: Microsoft Defender Antivirus
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Known issues: These applications and "Block credential stealing from the Windows local security authority subsystem" rule, are incompatible:
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|Application name|For information|
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| -------- | -------- |
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|Quest Dirsync Password Sync|[Dirsync Password Sync isn’t working when Windows Defender is installed, error: "VirtualAllocEx failed: 5" (4253914)](https://support.quest.com/kb/4253914/dirsync-password-sync-isn-t-working-when-windows-defender-is-installed-error-virtualallocex-failed-5)|
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For technical support, contact the software vendor.
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### Block executable content from email client and webmail
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This rule blocks email opened within the Microsoft Outlook application, or Outlook.com and other popular webmail providers from propagating the following file types:
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Dependencies: Microsoft Defender Antivirus
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Known issues: These applications and "Block Office applications from injecting code into other processes" rule, are incompatible:
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|Application name|For information|
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| -------- | -------- |
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|Avecto (BeyondTrust) Privilege Guard|[September-2024 (Platform: 4.18.24090.11 | Engine 1.1.24090.11)](/defender-endpoint/microsoft-defender-antivirus-updates). |
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|Heimdal security|n/a|
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For technical support, contact the software vendor.
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### Block Office communication application from creating child processes
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This rule prevents Outlook from creating child processes, while still allowing legitimate Outlook functions. This rule protects against social engineering attacks and prevents exploiting code from abusing vulnerabilities in Outlook. It also protects against [Outlook rules and forms exploits](https://blogs.technet.microsoft.com/office365security/defending-against-rules-and-forms-injection/) that attackers can use when a user's credentials are compromised.

defender-endpoint/configure-cloud-block-timeout-period-microsoft-defender-antivirus.md

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manager: deniseb
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ms.subservice: ngp
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ms.topic: conceptual
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ms.date: 07/25/2024
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ms.date: 11/10/2024
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ms.collection:
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- m365-security
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- tier2
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3. Select (or create) an antivirus policy.
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4. In the **Configuration settings** section, expand **Cloud protection**. Then, in the **Microsoft Defender Antivirus Extended Timeout In Seconds** box, specify the more time, in seconds, from 1 second to 50 seconds. Whatever you specify is added to the default 10 seconds.
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4. In the **Configuration settings** section, scroll down to **Cloud Extended Timeout** and specify the timeout, in seconds, from 0 to 50 seconds. Whatever you specify is added to the default 10 seconds.
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5. (This step is optional) Make any other changes to your antivirus policy. (Need help? See [Settings for Microsoft Defender Antivirus policy in Microsoft Intune](/mem/intune/protect/antivirus-microsoft-defender-settings-windows).)
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defender-endpoint/enable-cloud-protection-microsoft-defender-antivirus.md

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ms.topic: how-to
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ms.date: 04/03/2024
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ms.date: 11/10/2024
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ms.reviewer: pahuijbr
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| Task | Steps |
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|---------|---------|
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| Create a new policy | 1. For **Platform**, select **Windows 10, Windows 11, and Windows Server**. <br/><br/>2. For **Profile**, select **Microsoft Defender Antivirus**.<br/><br/>3. On the **Basics** page, specify a name and description for the policy, and then choose **Next**.<br/><br/>4. In the **Defender** section, find **Allow Cloud Protection**, and set it to **Allowed**. Then choose **Next**. <br/><br/>5. Scroll down to **Submit Samples Consent**, and select one of the following settings:<br/>- **Send all samples automatically**<br/>- **Send safe samples automatically**<br/><br/>6. On the **Scope tags** step, if your organization is using [scope tags](/mem/intune/fundamentals/scope-tags), select the tags you want to use, and then choose **Next**.<br/><br/>7. On the **Assignments** step, select the groups, users, or devices that you want to apply this policy to, and then choose **Next**.<br/><br/>8. On the **Review + create** step, review the settings for your policy, and then choose **Create**. |
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| Create a new policy | 1. For **Platform**, select **Windows**. <br/><br/>2. For **Profile**, select **Microsoft Defender Antivirus**.<br/><br/>3. On the **Basics** page, specify a name and description for the policy, and then choose **Next**.<br/><br/>4. In the **Defender** section, find **Allow Cloud Protection**, and set it to **Allowed**.<br/><br/>5. Scroll down to **Submit Samples Consent**, and select one of the following settings:<br/>- **Send all samples automatically**<br/>- **Send safe samples automatically**<br/><br/>6. On the **Scope tags** step, if your organization is using [scope tags](/mem/intune/fundamentals/scope-tags), select the tags you want to use, and then choose **Next**.<br/><br/>7. On the **Assignments** step, select the groups, users, or devices that you want to apply this policy to, and then choose **Next**.<br/><br/>8. On the **Review + create** step, review the settings for your policy, and then choose **Create**. |
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| Edit an existing policy | 1. Select the policy that you want to edit.<br/><br/>2. Under **Configuration settings**, choose **Edit**.<br/><br/>3. In the **Defender** section, find **Allow Cloud Protection**, and set it to **Allowed**.<br/><br/>4. Scroll down to **Submit Samples Consent**, and select one of the following settings:<br/>- **Send all samples automatically**<br/>- **Send safe samples automatically**<br/><br/>5. Select **Review + save**. |
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> [!TIP]

defender-endpoint/mde-plugin-wsl.md

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ms.custom:
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- partner-contribution
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audience: ITPro
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ms.date: 10/24/2024
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ms.date: 11/11/2024
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2020
---
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Be aware of the following considerations before you start:
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1. The plug-in doesn't support automatic updates on versions prior to `1.24.522.2`. On version `1.24.522.2` and later, updates are supported through Windows Update across all rings. Updates through Windows Server Update services (WSUS), System Center Configuration Manager (SCCM) and Microsoft Update catalog are supported only in the Production ring to ensure package stability.
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- The plug-in doesn't support automatic updates on versions prior to `1.24.522.2`. On version `1.24.522.2` and later. Updates are supported through Windows Update across all rings. Updates through Windows Server Update Services (WSUS), System Center Configuration Manager (SCCM), and Microsoft Update catalog are supported only in the Production ring to ensure package stability.
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2. It takes a few minutes for the plug-in to fully instantiate, and up to 30 minutes for a WSL2 instance to onboard itself. Short-lived WSL container instances might result in the WSL2 instance not showing up in the Microsoft Defender portal ([https://security.microsoft.com](https://security.microsoft.com)). Once any distribution has been running long enough (at least 30 minutes), it does show up.
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- It takes a few minutes for the plug-in to fully instantiate, and up to 30 minutes for a WSL2 instance to onboard itself. Short-lived WSL container instances might result in the WSL2 instance not showing up in the Microsoft Defender portal ([https://security.microsoft.com](https://security.microsoft.com)). When any distribution has been running long enough (at least 30 minutes), it does show up.
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3. Running a custom kernel and custom kernel command line is not supported. Although the plug-in does not block running in that configuration, it does not guarantee visibility within WSL when you're running a custom kernel and custom kernel command line. We recommend to block such configurations with help of [Microsoft Intune wsl settings](/windows/wsl/intune).
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- Running a custom kernel and custom kernel command line is not supported. Although the plug-in does not block running in that configuration, it does not guarantee visibility within WSL when you're running a custom kernel and custom kernel command line. We recommend blocking such configurations with [Microsoft Intune wsl settings](/windows/wsl/intune).
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4. OS Distribution is displayed **None** in the **Device overview** page of a WSL device in the Microsoft Defender portal.
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- The plug-in is not supported on machines with an ARM64 processor.
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5. The plug-in is not supported on machines with ARM64 processor.
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- The plug-in provides visibility into events from WSL, but other features like antimalware, threat and vulnerability management, and response commands are not available for the WSL logical device.
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## Software prerequisites
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- WSL version 2.0.7.0 or later must be running with at least one active distro.
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Run `wsl --update` to make sure you are on the latest version. If `wsl -–version` shows a version older than `2.0.7.0`, run `wsl -–update –pre-release` to get the latest update.
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- WSL version `2.0.7.0` or later must be running with at least one active distro. Run `wsl --update` to make sure you are on the latest version. If `wsl -–version` shows a version older than `2.0.7.0`, run `wsl -–update –pre-release` to get the latest update.
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- The Windows client device must be onboarded to Defender for Endpoint.
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> [!NOTE]
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> If `WslService` is running, it stops during the installation process. You do not need to onboard the subsystem separately. Instead, the plug-in automatically onboards to the tenant the Windows host is onboarded to.
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> Microsoft Defender for Endpoint update for plug-in for WSL [KB Update](https://support.microsoft.com/en-us/topic/microsoft-defender-for-endpoint-update-for-plug-in-for-wsl-9f4b2ddc-c47f-4c59-bd02-a3456c667966).
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## Installation validation checklist
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> The `DefenderProxyServer` registry key is no longer supported. Follow the steps described earlier in this article to configure proxy in plug-in.
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## Connectivity test for Defender running in WSL
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## Connectivity test for Defender for Endpoint running in WSL
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The defender connectivity test is triggered whenever there is a proxy modification on your device and is scheduled to run every hour.
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The Defender for Endpoint connectivity test is triggered whenever there is a proxy modification on your device and is scheduled to run every hour.
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On starting your wsl machine, wait for 5 minutes and then run `healthcheck.exe` (located at `%ProgramFiles%\Microsoft Defender for Endpoint plug-in for WSL\tools` for the results of the connectivity test). If successful, you can see that the connectivity test was a success. If failed, you can see that the connectivity test was `invalid` indicating that the client connectivity from MDE plug-in for WSL to Defender for Endpoint service URLs is failing.
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## Troubleshooting
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### Installation failure
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If you see an error on launching WSL, such as `A fatal error was returned by plugin 'DefenderforEndpointPlug-in' Error code: Wsl/Service/CreateInstance/CreateVm/Plugin/ERROR_FILE_NOT_FOUND`, it means the Defender for Endpoint plug-in for WSL installation is faulty. To repair it, follow these steps:
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1. In Control Panel, go to **Programs** > **Programs and Features**.
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2. Search for and select **Microsoft Defender for Endpoint plug-in for WSL**. Then select **Repair**. This action should fix the problem by placing the right files in the expected directories.
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:::image type="content" source="media/mdeplugin-wsl/plug-in-repair-control-panel.png" alt-text="Screenshot showing MDE plug-in for WSL repair option in control panel." lightbox="media/mdeplugin-wsl/plug-in-repair-control-panel.png":::
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:::image type="content" source="media/mdeplugin-wsl/wsl-health-check.png" alt-text="Screenshot showing PowerShell output." lightbox="media/mdeplugin-wsl/wsl-health-check.png":::
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:::image type="content" source="media/mdeplugin-wsl/wsl-health-check-overview.png" alt-text="Screenshot showing status in PowerShell output." lightbox="media/mdeplugin-wsl/wsl-health-check-overview.png":::
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2. Microsoft Defender Endpoint for WSL supports Linux distributions running on WSL 2. If they're associated with WSL 1, you might encounter issues. Therefore, it's advised to disable WSL 1. To do so with the Intune policy, perform the following steps:
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1. Go to your [Microsoft Intune admin center](https://intune.microsoft.com).
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Microsoft Defender Endpoint plug-in for WSL supports Linux distributions running on WSL 2. If they're associated with WSL 1, you might encounter issues. Therefore, it's advised to disable WSL 1. To do so with the Intune policy, perform the following steps:
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- The plug-in uses the Windows EDR ring by default. If you wish to switch to an earlier ring, set `OverrideReleaseRing` to one of the following under registry and restart WSL:
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- **Name**: `OverrideReleaseRing`
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4. If you see an error on launching WSL, such as "A fatal error was returned by plugin 'DefenderforEndpointPlug-in' Error code: Wsl/Service/CreateInstance/CreateVm/Plugin/ERROR_FILE_NOT_FOUND", it means the Defender for Endpoint plug-in for WSL installation is faulty. To repair it, follow these steps:
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:::image type="content" source="media/mdeplugin-wsl/plug-in-repair-control-panel.png" alt-text="Screenshot showing MDE plug-in for WSL repair option in control panel." lightbox="media/mdeplugin-wsl/plug-in-repair-control-panel.png":::

defender-endpoint/network-protection-macos.md

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> SmartScreen in Microsoft Edge for macOS does not currently support web content filtering, custom indicators, or other enterprise features. However, network protection provides this protection to Microsoft Edge for macOS if network protection is enabled.
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## Overview
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defender-endpoint/specify-cloud-protection-level-microsoft-defender-antivirus.md

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- **High Plus**: Uses the **High** level and applies extra protection measures (might affect client performance).
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- **Zero Tolerance**: Blocks all unknown executables.
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6. Choose **Review + save**, and then choose **Save**.
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6. Choose **Next**, and then choose **Save**.
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> [!TIP]
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> Need some help? See the following resources:

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