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107 lines
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107 lines
7.1 KiB
Markdown
---
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title: Configure how attack surface reduction rules work to finetune protection in your network
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description: You can individually set rules in audit, block, or disabled modes, and add files and folders that should be excluded from ASR
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keywords: Attack surface reduction, hips, host intrusion prevention system, protection rules, anti-exploit, antiexploit, exploit, infection prevention, customize, configure, exclude
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search.product: eADQiWindows 10XVcnh
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ms.pagetype: security
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ms.prod: w10
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ms.mktglfcycl: manage
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ms.sitesec: library
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ms.pagetype: security
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ms.localizationpriority: medium
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author: levinec
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ms.author: ellevin
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ms.date: 05/13/2019
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ms.reviewer:
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manager: dansimp
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---
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# Customize attack surface reduction rules
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**Applies to:**
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- [Microsoft Defender Advanced Threat Protection (Microsoft Defender ATP)](https://go.microsoft.com/fwlink/p/?linkid=2069559)
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>[!IMPORTANT]
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>Some information relates to prereleased product which may be substantially modified before it's commercially released. Microsoft makes no warranties, express or implied, with respect to the information provided here.
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Attack surface reduction rules help prevent actions and apps that are typically used by exploit-seeking malware to infect machines. Attack surface reduction rules are supported on Windows Server 2019 as well as Windows 10 clients.
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This topic describes how to customize attack surface reduction rules by [excluding files and folders](#exclude-files-and-folders) or [adding custom text to the notification](#customize-the-notification) alert that appears on a user's computer.
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You can use Group Policy, PowerShell, and MDM CSPs to configure these settings.
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## Exclude files and folders
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You can exclude files and folders from being evaluated by attack surface reduction rules. This means that even if an attack surface reduction rule detects that the file contains malicious behavior, the file will not be blocked from running.
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>[!WARNING]
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>This could potentially allow unsafe files to run and infect your devices. Excluding files or folders can severely reduce the protection provided by attack surface reduction rules. Files that would have been blocked by a rule will be allowed to run, and there will be no report or event recorded.
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An exclusion applies to all rules that allow exclusions. You can specify an individual file, folder path, or the fully qualified domain name for a resource, but you cannot limit an exclusion to certain rules.
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An exclusion is applied only when the excluded application or service starts. For example, if you add an exclusion for an update service that is already running, the update service will continue to trigger events until the service is stopped and restarted.
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Attack surface reduction supports environment variables and wildcards. For information about using wildcards, see [Use wildcards in the file name and folder path or extension exclusion lists](https://docs.microsoft.com/windows/security/threat-protection/windows-defender-antivirus/configure-extension-file-exclusions-windows-defender-antivirus#use-wildcards-in-the-file-name-and-folder-path-or-extension-exclusion-lists).
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If you are encountering problems with rules detecting files that you believe should not be detected, you should [use audit mode first to test the rule](evaluate-attack-surface-reduction.md).
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Rule description | GUID
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-|:-:|-
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Block all Office applications from creating child processes | D4F940AB-401B-4EFC-AADC-AD5F3C50688A
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Block execution of potentially obfuscated scripts | 5BEB7EFE-FD9A-4556-801D-275E5FFC04CC
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Block Win32 API calls from Office macro | 92E97FA1-2EDF-4476-BDD6-9DD0B4DDDC7B
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Block Office applications from creating executable content | 3B576869-A4EC-4529-8536-B80A7769E899
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Block Office applications from injecting code into other processes | 75668C1F-73B5-4CF0-BB93-3ECF5CB7CC84
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Block JavaScript or VBScript from launching downloaded executable content | D3E037E1-3EB8-44C8-A917-57927947596D
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Block executable content from email client and webmail | BE9BA2D9-53EA-4CDC-84E5-9B1EEEE46550
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Block executable files from running unless they meet a prevalence, age, or trusted list criteria | 01443614-cd74-433a-b99e-2ecdc07bfc25
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Use advanced protection against ransomware | c1db55ab-c21a-4637-bb3f-a12568109d35
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Block credential stealing from the Windows local security authority subsystem (lsass.exe) | 9e6c4e1f-7d60-472f-ba1a-a39ef669e4b2
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Block process creations originating from PSExec and WMI commands | d1e49aac-8f56-4280-b9ba-993a6d77406c
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Block untrusted and unsigned processes that run from USB | b2b3f03d-6a65-4f7b-a9c7-1c7ef74a9ba4
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Block Office communication applications from creating child processes | 26190899-1602-49e8-8b27-eb1d0a1ce869
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Block Adobe Reader from creating child processes | 7674ba52-37eb-4a4f-a9a1-f0f9a1619a2c
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Block persistence through WMI event subscription | e6db77e5-3df2-4cf1-b95a-636979351e5b
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See the [attack surface reduction](attack-surface-reduction-exploit-guard.md) topic for details on each rule.
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### Use Group Policy to exclude files and folders
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1. On your Group Policy management computer, 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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2. In the **Group Policy Management Editor** go to **Computer configuration** and click **Administrative templates**.
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3. Expand the tree to **Windows components > Windows Defender Antivirus > Windows Defender Exploit Guard > Attack surface reduction**.
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4. Double-click the **Exclude files and paths from Attack surface reduction Rules** setting and set the option to **Enabled**. Click **Show** and enter each file or folder in the **Value name** column. Enter **0** in the **Value** column for each item.
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### Use PowerShell to exclude files and folders
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1. Type **powershell** in the Start menu, right-click **Windows PowerShell** and click **Run as administrator**
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2. Enter the following cmdlet:
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```PowerShell
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Add-MpPreference -AttackSurfaceReductionOnlyExclusions "<fully qualified path or resource>"
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```
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Continue to use `Add-MpPreference -AttackSurfaceReductionOnlyExclusions` to add more folders to the list.
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>[!IMPORTANT]
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>Use `Add-MpPreference` to append or add apps to the list. Using the `Set-MpPreference` cmdlet will overwrite the existing list.
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### Use MDM CSPs to exclude files and folders
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Use the [./Vendor/MSFT/Policy/Config/Defender/AttackSurfaceReductionOnlyExclusions](https://docs.microsoft.com/windows/client-management/mdm/policy-csp-defender#defender-attacksurfacereductiononlyexclusions) configuration service provider (CSP) to add exclusions.
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## Customize the notification
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See the [Windows Security](../windows-defender-security-center/windows-defender-security-center.md#customize-notifications-from-the-windows-defender-security-center) topic for more information about customizing the notification when a rule is triggered and blocks an app or file.
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## Related topics
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- [Reduce attack surfaces with attack surface reduction rules](attack-surface-reduction-exploit-guard.md)
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- [Enable attack surface reduction rules](enable-attack-surface-reduction.md)
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- [Evaluate attack surface reduction rules](evaluate-attack-surface-reduction.md)
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