The following screen is displayed, where you can select a specific device and check its individual ASR rule configuration. Learn more about Attack Surface Reduction and the Event IDs used for it. For more information, please refer to Microsoft Endpoint Manager Overview. Some vendors offer ASM tools, which combine aspects of these services into a single console. Attack Surface Reduction or ASR is an umbrella term for a lot of the Windows built-in capabilities and the cloud-based features that Windows 10 offers. Minimizing your attack surface can yield large paybacks in decreased threat vulnerability and in allowing the security operations team to focus on other threat vectors. Click Next. Attack surfaces are all the places where your organization is vulnerable to cyberthreats and attacks. Value name). However, the core asr rules functionality is built into the Defender engine on Windows 10, and you can still use it on the following without any additional licensing Windows 10 . Another example is suspicious script behaviors that apps dont usually initiate during normal day-to-day work. Those exclusions only apply for MDAV and will be ignored for detections based on Microsoft Defender for Endpoint, by attack surface reduction rules or the controlled folder access feature. You must be a registered user to add a comment. For this some conditions must be met: Overview of Attack Surface Reduction Rules in Intune. Microsoft Defender Credential Guard in Windows normally prevents attempts to extract credentials from LSASS. Attack Surface Reduction Rules. Attack surface reduction (ASR) rules report - GitHub On the Create Profile page, click the Basics tab and enter the Profile name and description for the Attack Surface Reduction rule that you are going to configure. Block all Office applications from creating child processes. This blog post is focused on how to configure Microsoft Defender ATP ASR rules and how to work your way through exclusions. Find out more about the Microsoft MVP Award Program. A similar view can be found in Configuration Manager, within Endpoint Protection,within Endpoint Protection, Windows Defender Exploit Guard. This puts the setting 'Block credential stealing from the Windows local security authority subsystem (lsass.exe)' into audit mode. Block untrusted and unsigned processes that run from USB, With this rule, admins can prevent unsigned or untrusted executable files from running from USB removable drives, including SD cards. Powershell (get-mppreference).attacksurfacereductiononlyexclusions on one of the clients includes the SimonPro.exe entry. Various features in Defender for Endpoint might help you decrease your attack surfaces. Best practices and the latest news on Microsoft FastTrack, The employee experience platform to help people thrive at work, Expand your Azure partner-to-partner network, Bringing IT Pros together through In-Person & Virtual events. You can obtain a list of rules and their current state by using Get-MpPreference. How to Configure Attack Surface Reduction (ASR) Rules using MEM What does the new Microsoft Intune Suite include? The following is a sample for reference, using GUID values for Attack surface reduction rules reference. Each ASR rule contains one of four settings: We recommend using ASR rules with a Windows E5 license (or similar licensing SKU) to take advantage of the advanced monitoring and reporting capabilities available in Microsoft Defender for Endpoint (Defender for Endpoint). This policy setting allows you to prevent ASR rules from matching on files under the paths specified or for the . Be sure to enter OMA-URI values without spaces. Defender Policy CSP - Windows Client Management Such exclusions are applied to all attack surface reduction rules. Microsoft Endpoint Manager: Create & Audit an ASR Policy Windows Defender ATP Attack Surface Reduction Learn how to use ATP ASR rules on Windows Defender to significantly improve your security with a few basic rules Microsoft has made big advances with the Windows Defender technology shipped on Windows 10 and Windows Server 2016. Select the application you want to exclude and click on "Add Exclusion or Get exclusion details": The "Add Exclusions" button takes you right to Microsoft Defender for Endpoint > Attack Surface Reduction Profiles. To make it easier I am going to list some resources for getting started with Attack Surface Reduction rules in Intune. removing old servers, VMs and containers. Creating an effective defense plan requires understanding the scope of what you're protecting. Attack Surface Reduction (ASR) rules target specific behaviors that are typically used by malware and malicious apps to infect machines, such as: Executable files and scripts used in Office apps or web mail that attempt to download or run files. #1 What is the difference between ASR and ASR rules? The rule ID should not have any leading or trailing spaces. If you try to use an environment variable like %USERPROFILE% in an exclusion, the result will be C:\Windows\System32. Attack surface reduction rules (ASR) Service settings: Microsoft 365 Defender portal. When it comes to defending your corporate network, things are significantly more complicated. Peter Thayer and Iaan DSouza-Wiltshire (@IaanMSFT) Inventory management is a repository of known systems, while the asset discovery component of ASR scans for all systems, including the ones that haven't made it into the repository yet. Cookie Preferences Only the configurations for conflicting settings are held back. Add Row closes. We have SCCM, but we're mostly using it for application management - we're not using it to deploy the ASR policy. Once you've combined findings from the above and done a full asset discovery sweep, it's time to reduce the attack surface. #7 What rules to enable? Mobile platform technology giant launches immersive technology designed to create a cross-device, extended and augmented reality All Rights Reserved, Protect. Reduce attack surfaces with attack surface reduction rules for Windows Thank you! subversion or leverage, but also things like Webmail, script, WMI, LSASS, and much more. Enabled: Specify the folders or files and resources that should be excluded from ASR rules in the Options section. Click on Create button. 2. Configure attack surface reduction in Microsoft Defender - 4sysops Exclude files and paths from Attack Surface Reduction (ASR) rules. In this guide, we will learn about the Attack Surface Reduction Rules in Intune. The way we allow you to do so, is by referencing the actual rule Globally Unique Identifier (GUID). When audit telemetry reveals that line-of-business applications are no longer being impacted by the attack surface reduction rule, the attack surface reduction rule setting can be switched to block. This rule detects suspicious properties within an obfuscated script. It is an additional layer of expertise and optics that Microsoft customers can utilize to augment security operations capabilities as part of Microsoft 365. Well go through a couple of examples in this blog post. All!? apps, such as WordPress, running on servers. For example, ""C:\Windows"" will exclude all files in that directory. ASR rules were created so that enterprises can secure their endpoints along with protections that work alongside Microsoft Defender ATP, Microsoft Defender antivirus, and Endpoint Detection and Response (EDR), to provide a robust endpoint solution that gives security admins the control and visibility they need. Only the settings that aren't in conflict are merged. The Add Row OMA-URI Settings opens. Copyright 2000 - 2023, TechTarget You can leverage other configuration mechanisms, such as GPO, or features within Configuration Manager and Intune, such as Configuration Packages or PowerShell scripts, to enable rules that are not available in the default built-in list. How to write an RFP for a software purchase, with template. Demystifying attack surface reduction rules - Part 1 Attack surface reduction rules help close off many of the common entry points used by malware and ransomware, preventing attacks from ever reaching the point where AV and EDR solutions would detect them. [!TIP] If you've already registered, sign in. Why give malware and exploits even an inch (or a centimeter) of your endpoints surface area before you let your corporate users in to start being productive. This rule blocks Office apps from creating child processes. Attackers might attempt to use Office apps to migrate malicious code into other processes through code injection, so the code can masquerade as a clean process. Both PsExec and WMI can remotely execute code. The above is one example, but I'm having trouble with exclusions on other ASR rules as well. ASR asset discovery shines a light on shadow IT. Finally, Microsoft Defender ATP engineers made sure that OS components and several legitimate 3rd party apps play nice with ASR rules. Previously, if two policies included conflicts for a single setting, both policies were flagged as being in conflict, and no settings from either profile would be deployed. Merge behavior for Attack surface reduction rules in Intune: Attack surface reduction rules support a merger of settings from different policies, to create a superset of policy for each device. On your Group Policy management computer, open the Group Policy Management Console, right-click the Group Policy Object you want to configure and select Edit. In step 6 Review + create, review the settings and information you've selected and entered, and then select Create. Let us call the process we want to exclude test.exe for our next example. Configure Attack Surface Reduction in Windows 10
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