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defender-endpoint/comprehensive-guidance-on-linux-deployment.md

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ms.topic: conceptual
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ms.subservice: linux
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search.appverid: met150
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ms.date: 05/08/2024
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ms.date: 09/10/2024
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---
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# Advanced deployment guidance for Microsoft Defender for Endpoint on Linux
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#### Step 3: Verify SSL inspection isn't being performed on the network traffic
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To prevent man-in-the-middle attacks, all Microsoft Azure hosted traffic uses certificate pinning. As a result, SSL inspections by major firewall systems aren't allowed. You have to bypass SSL inspection for Microsoft Defender for Endpoint URLs.
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To prevent man-in-the-middle attacks, all Microsoft Azure hosted traffic uses certificate pinning. As a result, SSL inspections by major firewall systems aren't allowed. You must bypass SSL inspection for Microsoft Defender for Endpoint URLs. For additional information about the certificate pinning process, see [enterprise-certificate-pinning] (/windows/security/identity-protection/enterprise-certificate-pinning).
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##### Troubleshoot cloud connectivity issues
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defender-endpoint/configure-extension-file-exclusions-microsoft-defender-antivirus.md

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ms.service: defender-endpoint
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ms.localizationpriority: medium
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ms.date: 04/03/2024
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ms.date: 09/10/2024
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author: siosulli
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- Windows
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You can define exclusions for Microsoft Defender Antivirus that apply to [scheduled scans](schedule-antivirus-scans.md), [on-demand scans](run-scan-microsoft-defender-antivirus.md), and [always-on, real-time protection and monitoring](configure-real-time-protection-microsoft-defender-antivirus.md). **Generally, you don't need to apply exclusions**. If you do need to apply exclusions, then you can choose from the following:
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You can define exclusions for Microsoft Defender Antivirus that apply to [scheduled scans](schedule-antivirus-scans.md), [on-demand scans](run-scan-microsoft-defender-antivirus.md), and [always-on, real-time protection and monitoring](configure-real-time-protection-microsoft-defender-antivirus.md). **Generally, you don't need to apply exclusions**. If you do need to apply exclusions, then you can choose from the following types:
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- Exclusions based on file extensions and folder locations (described in this article)
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- [Exclusions for files that are opened by processes](configure-process-opened-file-exclusions-microsoft-defender-antivirus.md)
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## Exclusion lists
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To exclude certain files from Microsoft Defender Antivirus scans, modify your exclusion lists. Microsoft Defender Antivirus includes many automatic exclusions based on known operating system behaviors and typical management files, such as those used in enterprise management, database management, and other enterprise scenarios and situations.
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To exclude certain files from Microsoft Defender Antivirus scans, modify your exclusion lists. Microsoft Defender Antivirus includes many automatic exclusions based on known operating system behaviors and typical management files, such as those used in enterprise management, database management, and other enterprise scenarios.
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> [!NOTE]
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> Exclusions apply to [potentially unwanted apps (PUA) detections](detect-block-potentially-unwanted-apps-microsoft-defender-antivirus.md) as well.
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4. Open the **Path Exclusions** setting for editing, and add your exclusions.
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1. Set the option to **Enabled**.
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2. Under the **Options** section, select **Show**.
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3. Specify each folder on its own line under the **Value name** column.
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4. If you are specifying a file, ensure that you enter a fully qualified path to the file, including the drive letter, folder path, file name, and extension.
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4. If you're specifying a file, ensure that you enter a fully qualified path to the file, including the drive letter, folder path, file name, and extension.
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5. Enter **0** in the **Value** column.
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5. Choose **OK**.
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6. Choose **OK**.
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6. Open the **Extension Exclusions** setting for editing and add your exclusions.
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5. Open the **Extension Exclusions** setting for editing and add your exclusions.
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1. Set the option to **Enabled**.
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2. Under the **Options** section, select **Show**.
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3. Enter each file extension on its own line under the **Value name** column.
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4. Enter **0** in the **Value** column.
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7. Choose **OK**.
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5. Choose **OK**.
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<a id="ps"></a>
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|Exclusion type|PowerShell parameter|
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|---|---|
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|All files with a specified file extension|`-ExclusionExtension`|
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|All files under a folder (including files in sub-directories), or a specific file|`-ExclusionPath`|
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|All files under a folder (including files in subdirectories), or a specific file|`-ExclusionPath`|
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> [!IMPORTANT]
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> If you have created a list, either with `Set-MpPreference` or `Add-MpPreference`, using the `Set-MpPreference` cmdlet again overwrites the existing list.
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## Use wildcards in the file name and folder path or extension exclusion lists
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You can use the asterisk `*`, question mark `?`, or environment variables (such as `%ALLUSERSPROFILE%`) as wildcards when defining items in the file name or folder path exclusion list. The way these wildcards are interpreted differs from their usual usage in other apps and languages. Make sure to read this section to understand their specific limitations.
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You can use the asterisk `*`, question mark `?`, or environment variables (such as `%ALLUSERSPROFILE%`) as wildcards when defining items in the file name or folder path exclusion list. You can mix and match `*` and `?` and environment variables into a single exclusion. The way these wildcards are interpreted differs from their usual usage in other apps and languages. Make sure to read this section to understand their specific limitations.
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> [!IMPORTANT]
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> There are key limitations and usage scenarios for these wildcards:
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|`*` (asterisk) <br/><br/> In **file name and file extension inclusions**, the asterisk replaces any number of characters, and only applies to files in the last folder defined in the argument. <br/><br/> In **folder exclusions**, the asterisk replaces a single folder. Use multiple `*` with folder slashes `\` to indicate multiple nested folders. After matching the number of wild carded and named folders, all subfolders are also included.|`C:\MyData\*.txt` includes `C:\MyData\notes.txt` <br/><br/> `C:\somepath\*\Data` includes any file in `C:\somepath\Archives\Data` and its subfolders, and `C:\somepath\Authorized\Data` and its subfolders <br/><br/> `C:\Serv\*\*\Backup` includes any file in `C:\Serv\Primary\Denied\Backup` and its subfolders, and `C:\Serv\Secondary\Allowed\Backup` and its subfolders|
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|`?` (question mark) <br/><br/> In **file name and file extension inclusions**, the question mark replaces a single character, and only applies to files in the last folder defined in the argument. <br/><br/> In **folder exclusions**, the question mark replaces a single character in a folder name. After matching the number of wild carded and named folders, all subfolders are also included.|`C:\MyData\my?.zip` includes `C:\MyData\my1.zip` <br/><br/> `C:\somepath\?\Data` includes any file in `C:\somepath\P\Data` and its subfolders <br/><br/> `C:\somepath\test0?\Data` would include any file in `C:\somepath\test01\Data` and its subfolders|
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|Environment variables <br/><br/> The defined variable is populated as a path when the exclusion is evaluated.|`%ALLUSERSPROFILE%\CustomLogFiles` would include `C:\ProgramData\CustomLogFiles\Folder1\file1.txt`|
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|Mix and Match <br/><br/>Environment variables `*` and `?` can be combined into a single exclusion|`%PROGRAMFILES%\Contoso*\v?\bin\contoso.exe` would include `c:\Program Files\Contoso Labs\v1\bin\contoso.exe`|
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> [!IMPORTANT]
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> If you mix a file exclusion argument with a folder exclusion argument, the rules stop at the file argument match in the matched folder, and don't look for file matches in any subfolders.
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If you use PowerShell, you can retrieve the list in the following two ways:
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- Retrieve the status of all Microsoft Defender Antivirus preferences. Each list is displayed on separate lines, but the items within each list are combined into the same line.
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- Write the status of all preferences to a variable, and use that variable to only call the specific list you are interested in. Each use of `Add-MpPreference` is written to a new line.
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- Write the status of all preferences to a variable, and use that variable to only call the specific list you're interested in. Each use of `Add-MpPreference` is written to a new line.
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### Validate the exclusion list by using MpCmdRun
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You can validate that your exclusion lists are working by using PowerShell with either the `Invoke-WebRequest` cmdlet or the .NET WebClient class to download a test file.
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In the following PowerShell snippet, replace `test.txt` with a file that conforms to your exclusion rules. For example, if you have excluded the `.testing` extension, replace `test.txt` with `test.testing`. If you're testing a path, make sure that you run the cmdlet within that path.
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In the following PowerShell snippet, replace `test.txt` with a file that conforms to your exclusion rules. For example, if you're excluding the `.testing` extension, replace `test.txt` with `test.testing`. If you're testing a path, make sure that you run the cmdlet within that path.
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If Microsoft Defender Antivirus reports malware, then the rule is not working. If there is no report of malware and the downloaded file exists, then the exclusion is working. You can open the file to confirm the contents are the same as what is described on the [EICAR test file website](https://www.eicar.org/download-anti-malware-testfile/).
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If Microsoft Defender Antivirus reports malware, then the rule isn't working. If there's no report of malware and the downloaded file exists, then the exclusion is working. You can open the file to confirm the contents are the same as what is described on the [EICAR test file website](https://www.eicar.org/download-anti-malware-testfile/).
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You can also use the following PowerShell code, which calls the .NET WebClient class to download the test file - as with the `Invoke-WebRequest` cmdlet; replace `c:\test.txt` with a file that conforms to the rule you are validating:
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You can also use the following PowerShell code, which calls the .NET WebClient class to download the test file - as with the `Invoke-WebRequest` cmdlet; replace `c:\test.txt` with a file that conforms to the rule you're validating:
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You can also copy the string into a blank text file and attempt to save it with the file name or in the folder you are attempting to exclude.
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You can also copy the string into a blank text file and attempt to save it with the file name or in the folder you're attempting to exclude.
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> [!TIP]
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## See also
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- [Configure and validate exclusions in Microsoft Defender Antivirus scans](configure-exclusions-microsoft-defender-antivirus.md)
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- [Configure and validate exclusions for files opened by processes](configure-process-opened-file-exclusions-microsoft-defender-antivirus.md)
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- [Configure Microsoft Defender Antivirus exclusions on Windows Server](configure-server-exclusions-microsoft-defender-antivirus.md)
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- [Common mistakes to avoid when defining exclusions](common-exclusion-mistakes-microsoft-defender-antivirus.md)
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[!INCLUDE [Microsoft Defender for Endpoint Tech Community](../includes/defender-mde-techcommunity.md)]

defender-xdr/advanced-hunting-limits.md

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The graph displays resource usage over time per interface. You can easily identify excessive usage and select the spikes in the graph to filter the table accordingly. Once you select an entry in the graph, the table is filtered to that specific date.
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You can identify the queries that used the most resources on that day and take action to improve them – by [applying query best practices](advanced-hunting-best-practices.md) or educating the user who ran the query or created the rule to take query efficiency and resources into consideration. For guided mode, the user needs to [switch to advanced mode](advanced-hunting-query-builder-details.md#switch-to-advanced-mode-after-building-a-query) to edit the query.
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You can identify the queries that used the most resources on that day and take action to improve them – by [applying query best practices](advanced-hunting-best-practices.md) or educating the user who ran the query or created the rule to take query efficiency and resources into consideration.
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defender-xdr/investigate-incidents.md

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:::image type="content" source="/defender/media/investigate-incidents/fig2-gohunt-attackstory.png" alt-text="Highlighting the link to incident option in go hunt query results" lightbox="/defender/media/investigate-incidents/fig2-gohunt-attackstory.png":::
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Use the **Summary** page to assess the relative importance of the incident and quickly access the associated alerts and impacted entities. The **Summary** page gives you a snapshot glance at the top things to notice about the incident.

defender-xdr/whats-new.md

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- [Microsoft Defender Threat Intelligence](/defender/threat-intelligence/what-is-microsoft-defender-threat-intelligence-defender-ti) customers can now view the [latest featured threat intelligence articles](/defender/threat-intelligence/learn-how-to-access-microsoft-defender-threat-intelligence-and-make-customizations-in-your-portal#featured-threat-intelligence-articles-widget) in the Microsoft Defender portal home page. The **Intel explorer** page now also has an [article digest](/defender/threat-intelligence/learn-how-to-access-microsoft-defender-threat-intelligence-and-make-customizations-in-your-portal#article-digest) that notifies them of the number of new Defender TI articles that were published since they last accessed the Defender portal.
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- [Microsoft Defender XDR Unified RBAC permissions](experts-on-demand.md#required-permissions-for-using-ask-defender-experts) are added to submit inquiries and view responses from [Microsoft Defender Experts](experts-on-demand.md). You can also [view responses](experts-on-demand.md#where-to-view-responses-from-defender-experts) to inquires submitted to Ask Defender Experts through your listed email addresses when submitting your inquiry or in the Defender portal by navigating to **Reports** > **Defender Experts messages**.
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- (GA) **Advanced hunting context panes** are now available in more experiences. This allows you to access the advanced hunting feature without leaving your current workflow.
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- For incidents and alerts generated by analytics rules, you can select **Run query** to explore the results of the related analytics rule.
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- In the analytics rule wizard's *Set rule logic* step, you can select **View query results** to verify the results of the query you are about to set.
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- In the [query resources report](advanced-hunting-limits.md#find-resource-heavy-queries), you can view any of the queries by selecting the three dots on the query row and selecting **Open in query editor**.
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- For device entities involved in incidents or alerts, **Go hunt** is also available as one of the options after selecting the three dots on the device side panel.
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- (Preview) Microsoft Sentinel data is now available with Defender XDR data in Microsoft Defender multitenant management. Only one Microsoft Sentinel workspace per tenant is currently supported in the Microsoft unified security operations platform. So, Microsoft Defender multitenant management shows security information and event management (SIEM) data from one Microsoft Sentinel workspace per tenant. For more information, see [Microsoft Defender multitenant management](mto-overview.md) and [Microsoft Sentinel in the Microsoft Defender portal](/azure/sentinel/microsoft-sentinel-defender-portal).
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- To ensure a smooth experience while navigating the Microsoft Defender portal, configure your network firewall by adding the appropriate addresses to your allow list. For more information, see [Network firewall configuration for Microsoft Defender XDR](m365d-enable.md#configure-your-network-firewall).
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- Incidents with alerts where a compromised device communicated with an operational technology (OT) device are now visible in the Microsoft Defender portal through the [Microsoft Defender for IoT license and Defender for Endpoint’s device discovery capabilities](/defender-endpoint/device-discovery#device-discovery-integration). Using Defender for Endpoint data, Defender XDR automatically correlates these new OT alerts to incidents to provide a comprehensive attack story. To filter related incidents, see [Prioritize incidents in the Microsoft Defender portal](incident-queue.md#filters-).

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