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Iaan D'Souza-Wiltshire
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---
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title: Configure and valudate exclusions for files opened by specific processes
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title: Configure and validate exclusions for files opened by specific processes
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description: You can exclude files from scans if they have been opened by a specific process.
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keywords: process, exclusion, files, scans
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search.product: eADQiWindows 10XVcnh
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@ -224,232 +224,6 @@ $client.DownloadFile("http://www.eicar.org/download/eicar.com.txt","c:\test.txt"
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```
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<a id="ps"></a>
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## Use PowerShell cmdlets and WMI to configure exclusion lists
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Excluding and reviewing file extensions, paths and files (including processes), and files opened by processes with PowerShell requires using a combination of four cmdlets and the appropriate exclusion list parameter. The cmdlets are all in the [Defender module](https://technet.microsoft.com/en-us/itpro/powershell/windows/defender/defender).
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There are three exclusion lists:
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- ExclusionExtension
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- ExclusionPath
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- ExclusionProcess
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You can modify each of the lists with the following cmdlets:
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- Set-MpPreference to create or overwrite the defined list
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- Add-MpPreference to add new items to the defined list
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- Remove-MpPreference to remove or delete items from the defined list
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- Get-MpPreference to review the items in the list, either all at once with all other Windows Defender AV settings, or individually for each of the lists
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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 will overwrite the existing list.
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The following matrix provides sample commands based on what you want to exclude, and whether you want to create a list, add to the list, or remove items from the list.
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<table>
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<tr><th>Configuration action</th><th>Type of exclusion</th><th>PowerShell command</th></tr>
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<tr><td rowspan="3">Create or overwrite a list</td><td>File extensions that should be excluded from scans</td><td>
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Set-MpPreference -ExclusionExtension ".extension1, .extension2, .extension3"</td></tr>
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<tr><td>Files (including processes) and paths that should be excluded from scans</td><td>
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Set-MpPreference -ExclusionPath "c:\example, d:\test\process.exe, c:\test\file.bat"</td></tr>
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<tr><td>Files opened by the specified processes (executables)</td><td>
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Set-MpPreference -ExclusionProcess "c:\example\test.exe"</td></tr>
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<tr><td rowspan="3">Add to a list</td><td>File extensions that should be excluded from scans</td><td>
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Add-MpPreference -ExclusionExtension ".extension4, .extension5"</td></tr>
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<tr><td>Files (including processes) and paths that should be excluded from scans</td><td>
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Add-MpPreference -ExclusionPath "d:\test, d:\example\file.png"</td></tr>
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<tr><td>Files opened by specified processes (executables)</td><td>
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Add-MpPreference -ExclusionProcess "f:\test\sample.exe"</td></tr>
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<tr><td rowspan="3">Remove items from a list</td><td>File extensions that should be excluded from scans</td><td>
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Remove-MpPreference -ExclusionExtension ".extension1, .extension4, .extension5"</td></tr>
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<tr><td>Files (including processes) and paths that should be excluded from scans</td><td>
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Remove-MpPreference -ExclusionPath "c:\example, d:\example\file.png"</td></tr>
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<tr><td>Files opened by specified processes (executables)</td><td>
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Remove-MpPreference -ExclusionProcess "c:\example\test.exe"</td></tr>
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</table>
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### Review the exclusion lists with PowerShell
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You can retrieve the items in any of the lists in two ways:
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- Retrieve the status of all Windows Defender AV preferences. Each of the three lists will be displayed on separate lines, but the items within the list will be combined into the same line.
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- Write the status of all preferences to a variable, and only call the specific list you are interested in. Each use of `Add-MpPreference` is written to a new line.
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In both instances the items are sorted alphabetically.
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The following sequence of code examples helps to show how this works.
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1. Create an example list of extensions that should be excluded from scans:
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```PowerShell
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PS C:\> Set-MpPreference -ExclusionExtension ".test1, .test2"
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```
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2. Add some additional extensions:
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```PowerShell
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PS C:\> Add-MpPreference -ExclusionExtension ".test40, test50"
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```
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3. Add another set of extensions:
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```PowerShell
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PS C:\> Add-MpPreference -ExclusionExtension ".secondadd1, .secondadd2"
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```
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4. Review the list as a combined list:
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```PowerShell
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PS C:\> Get-MpPreference
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```
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5. Use a variable to store and retrieve only the exclusions list:
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```PowerShell
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PS C:\> $WDAVprefs = Get-MpPreference
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PS C:\> $WDAVprefs.ExclusionExtension
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```
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See [Use PowerShell cmdlets to configure and run Windows Defender Antivirus](use-powershell-cmdlets-windows-defender-antivirus.md) and [Defender cmdlets](https://technet.microsoft.com/itpro/powershell/windows/defender/index) for more information on how to use PowerShell with Windows Defender Antivirus.
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### Use Windows Management Instruction (WMI) to configure file extension exclusions
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Use the [ **Set**, **Add**, and **Remove** methods of the **MSFT_MpPreference**](https://msdn.microsoft.com/en-us/library/dn455323(v=vs.85).aspx) class for the following properties:
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```WMI
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ExclusionExtension
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ExclusionPath
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ExclusionProcess
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```
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The use of **Set**, **Add**, and **Remove** are analogous to their counterparts in PowerShell: `Set-MpPreference`, `Add-MpPreference`, and `Remove-MpPreference`.
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See the following for more information and allowed parameters:
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- [Windows Defender WMIv2 APIs](https://msdn.microsoft.com/en-us/library/dn439477(v=vs.85).aspx)
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<a id="man-tools"></a>
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## Use System Center Configuration Manager, Intune, or the Windows Defender Security Center app to configure exclusion lists
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**Use Configuration Manager to configure file extension exclusions:**
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See [How to create and deploy antimalware policies: Exclusion settings](https://docs.microsoft.com/en-us/sccm/protect/deploy-use/endpoint-antimalware-policies#exclusion-settings) for details on configuring System Center Configuration Manager (current branch).
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**Use Microsoft Intune to configure file extension exclusions:**
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See [Help secure Windows PCs with Endpoint Protection for Microsoft Intune](https://docs.microsoft.com/en-us/intune/deploy-use/help-secure-windows-pcs-with-endpoint-protection-for-microsoft-intune) and [Windows Defender policy settings in Windows 10](https://docs.microsoft.com/en-us/intune/deploy-use/windows-10-policy-settings-in-microsoft-intune#windows-defender-1) for more details.
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**Use the Windows Defender Security app to add exclusions to Windows Defender AV:**
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See [Add exclusions in the Windows Defender Security Center app](windows-defender-security-center-antivirus.md#exclusions) for instructions.
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## Configure auto exclusions lists for Windows Server deployments
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If you are using Windows Defender AV to protect Windows Server endpoints or machines, you are [automatically enrolled in certain exclusions](https://technet.microsoft.com/en-us/windows-server-docs/security/windows-defender/automatic-exclusions-for-windows-defender), as defined by your specified Windows Server Role.
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These exclusions will not appear in the standard exclusion lists shown in the [Windows Defender Security Center app](windows-defender-security-center-antivirus.md#exclusions).
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You can still add or remove custom exclusions (in addition to the Server Role-defined auto exclusions) as described in the other sections in this topic.
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You can also disable the auto-exclusions lists with Group Policy, PowerShell cmdlets, and WMI.
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**Use Group Policy to disable the auto-exclusions list on Windows Server 2016:**
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1. On your Group Policy management machine, open the [Group Policy Management Console](https://technet.microsoft.com/library/cc731212.aspx), right-click the Group Policy Object you want to configure and click **Edit**.
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3. In the **Group Policy Management Editor** go to **Computer configuration**.
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4. Click **Policies** then **Administrative templates**.
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5. Expand the tree to **Windows components > Windows Defender Antivirus > Exclusions**.
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6. Double-click the **Turn off Auto Exclusions** setting and set the option to **Enabled**. Click **OK**.
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**Use PowerShell cmdlets to disable the auto-exclusions list on Windows Server 2016:**
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Use the following cmdlets:
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```PowerShell
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Set-MpPreference -DisableAutoExclusions
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```
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See [Use PowerShell cmdlets to configure and run Windows Defender Antivirus](use-powershell-cmdlets-windows-defender-antivirus.md) and [Defender cmdlets](https://technet.microsoft.com/itpro/powershell/windows/defender/index) for more information on how to use PowerShell with Windows Defender Antivirus.
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**Use Windows Management Instruction (WMI) to disable the auto-exclusions list on Windows Server 2016:**
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Use the [**Set** method of the **MSFT_MpPreference**](https://msdn.microsoft.com/en-us/library/dn455323(v=vs.85).aspx) class for the following properties:
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```WMI
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DisableAutoExclusions
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```
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See the following for more information and allowed parameters:
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- [Windows Defender WMIv2 APIs](https://msdn.microsoft.com/en-us/library/dn439477(v=vs.85).aspx)
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## Use wildcards in exclusion lists
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You can use the asterisk **\***, question mark **?**, or environment variables (such as %APPDATA%) as wildcards when defining items in the exclusion lists.
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You cannot use a wildcard in place of a drive letter.
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The following table describes how the wildcards can be used and provides some examples.
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Wildcard | Use | Example use | Example matches
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---|---|---|---
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**\*** (asterisk) | Replaces any number of chararacters | <ul><li>C:\MyData\my\*.zip</li><li>C:\somepath\\\*\Data</li><li>.t\*t</li></ul> | <ul><li>C:\MyData\my-archived-files-43.zip</li><li>C:\somepath\folder1\folder2\Data</li><li>.test</li></ul>
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**?** (question mark) | Replaces a single character | <ul><li>C:\MyData\my\*.zip</li><li>C:\somepath\\\*\Data</li><li>.t\*t</li></ul> | <ul><li>C:\MyData\my1.zip</li><li>C:\somepath\P\Data</li><li>.txt </li></ul>
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Environment variables | The defined variable will be populated as a path when the exclusion is evaluated | <ul><li>%ALLUSERSPROFILE%\CustomLogFiles</li><li>%APPDATA%\Data\file.png</li></ul> | <ul><li>C:\ProgramData\CustomLogFiles\Folder1\file1.txt</li><li>C:\Users\username\AppData\Roaming\Data\file.png</li></ul>
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<a id="validate"></a>
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## Validate exclusions lists with the EICAR test file
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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 are testing a path, ensure you run the cmdlet within that path.
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```PowerShell
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Invoke-WebRequest "http://www.eicar.org/download/eicar.com.txt" -OutFile "test.txt"
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```
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If Windows Defender AV 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 testfile website](http://www.eicar.org/86-0-Intended-use.html).
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You can also use the following PowerShell code, which calls the .NET WebClient class to download the testfile - 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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```PowerShell
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$client = new-object System.Net.WebClient
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$client.DownloadFile("http://www.eicar.org/download/eicar.com.txt","c:\test.txt")
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```
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## Related topics
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- [Configure and validate exclusions in Windows Defender AV scans](configure-exclusions-windows-defender-antivirus.md)
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