Overview of Attack Surface Reduction Rules in Intune MEM

 In this guide, we will understand what are Attack Surface Reduction Rules in Intune (MEM). Using Intune, you can create and configure ASR Rules for your organization. Let’s understand what are Attack Surface Reduction Rules and list of ASR rules available for configuration.


The Attack Surface reduction rules that you create in Intune (MEM) apply to Microsoft Defender for Endpoint Plan 2, Microsoft 365 Defender and Microsoft Defender Antivirus. There are many examples of ASR rules that you can create with Microsoft Intune and I will share a list of ASR Rules in this guide.

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Microsoft recommends you to test how Intune ASR rules will impact your organization before enabling them by running ASR rules in audit mode for a brief period of time. While you are running the rules in audit mode, you can identify any line-of-business applications that might get blocked erroneously, and exclude them from ASR. Start with a small, controlled group to limit potential work disruptions, and later you can expand your deployment across your organization.


Attacks Surface Reduction is a complex topic, and there are many aspects to consider. To make it easier I am going to list some resources for getting started with Attack Surface Reduction rules in Intune.


Understand and use attack surface reduction capabilities

Attack surface reduction rules overview

Plan attack surface reduction (ASR) rules deployment

Test attack surface reduction (ASR) rules

Enable attack surface reduction (ASR) rules

Operationalize attack surface reduction (ASR) rules

What are Attack Surfaces?

Attack surfaces are all the places where your organization is vulnerable to cyberthreats and attacks. Defender for Endpoint includes numerous capabilities to help reduce your attack surfaces.


All the points where your company is exposed to cyberthreats and attacks are known as attack surfaces. Various features in Defender for Endpoint might help you decrease your attack surfaces.


Methods to Configure ASR Capabilities

When you configure attack surface reduction capabilities, you can choose from among several methods:


Microsoft Endpoint Manager (includes Microsoft Intune and Configuration Manager)

Group Policy

PowerShell cmdlets


What are Attack Surface Reduction Rules in Intune?

Attack surface reduction measures focus on actions that malware and malicious software commonly take to infect computers, such as: executable files and scripts used in Office applications or web mail that attempt to download or run files obfuscated. Another example is suspicious script behaviors that apps don’t usually initiate during normal day-to-day work.


For Intune, ASR rules target certain software behaviors, such as:

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Launching executable files and scripts that attempt to download or run files

Running obfuscated or otherwise suspicious scripts

Behaviors that apps don’t usually occur during normal day-to-day work

By reducing the different attack surfaces, you can help prevent attacks from happening in the first place. Take a look at detailed guide on how to use attack surface reduction capabilities.


Operating System Requirements for ASR Rules

You can set attack surface reduction rules for devices that are running any of the following editions and versions of Windows:


Windows 10 Pro, version 1709 or later

Windows 10 Enterprise, version 1709 or later

Windows Server, version 1803 (Semi-Annual Channel) or later

Windows Server 2022

Windows Server 2019

Windows Server 2016

Windows Server 2012 R2

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