For example: The following profiles have been updated: Platform: Windows 10 and later: Profiles for this platform are supported on Windows 10 and Windows 11 devices enrolled with Intune. Exploit protection consists of many mitigations that can apply to either the operating system or individual apps. When viewing a settings information text, you can use its Learn more link to open that content. Those events are good events because the software update process should not access lsass.exe. Each line in the CSV file should be formatted as follows: Select Next on the three configuration panes, then select Create if you're creating a new policy or Save if you're editing an existing policy. You can specify individual files or folders (using folder paths or fully qualified resource names) but you can't specify which rules or exclusions apply to. After 24 hours, the end-user will need to allow the block again. For more information, see Overview of attack surface reduction in the Windows Threat protection documentation. This means that even if an ASR rule determines the file or folder contains malicious behavior, it doesn't block the file from running. Intune name: Advanced ransomware protection, Configuration Manager name: Use advanced protection against ransomware, GUID: c1db55ab-c21a-4637-bb3f-a12568109d35, More info about Internet Explorer and Microsoft Edge, Microsoft Microsoft 365 Defender for Endpoint Plan 1, ASR rules supported operating system versions, ASR rules supported configuration management systems, Per ASR rule alert and notification details, Attack surface reduction (ASR) rules deployment guide, Block Adobe Reader from creating child processes, Block process creations originating from PSExec and WMI commands, Block credential stealing from the Windows local security authority subsystem (lsass.exe), Block Office applications from creating executable content, Block Office applications from injecting code into other processes, Block Office communication application from creating child processes, Test attack surface reduction (ASR) rules, New functionality in the modern unified solution for Windows Server 2012 R2 and 2016 Preview, Block abuse of exploited vulnerable signed drivers, Block all Office applications from creating child processes, Block executable content from email client and webmail, Block executable files from running unless they meet a prevalence, age, or trusted list criterion, Block execution of potentially obfuscated scripts, Block JavaScript or VBScript from launching downloaded executable content, Block persistence through Windows Management Instrumentation (WMI) event subscription, Block untrusted and unsigned processes that run from USB, Use advanced protection against ransomware, Onboard Windows Servers to the Defender for Endpoint service, Block persistence through WMI event subscription, System Center Configuration Manager (SCCM) CB 1710, calling Win32 APIs to launch malicious shellcode, Attack surface reduction (ASR) rules deployment overview, Plan attack surface reduction (ASR) rules deployment, Enable attack surface reduction (ASR) rules, Operationalize attack surface reduction (ASR) rules, Attack surface reduction (ASR) rules report, Exclusions for Microsoft Defender for Endpoint and Microsoft Defender Antivirus, ASR rules with combinations are used to surface alerts (toast notifications) on Microsoft Defender for Endpoint only for devices at cloud block level, EDR alerts are generated for ASR rules in the specified states, for devices at cloud block level, Executable files (such as .exe, .dll, or .scr), Script files (such as a PowerShell .ps1, Visual Basic .vbs, or JavaScript .js file). 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. CSP: DisallowExploitProtectionOverride, Enable Network Protection (Device) Thus, launching untrusted or unknown executable files can be risky, as it might not be initially clear if the files are malicious. Malware authors also use obfuscation to make malicious code harder to read, which hampers close scrutiny by humans and security software. Block write access to removable storage CSP: AllowWindowsDefenderApplicationGuard. Configuring Microsoft Defender for Endpoint (MDE) attack surface reduction (ASR) rules can help. For Profile type, select Attack surface reduction rules. The lists are merged into a single allowlist where any duplicate setup classes are removed. CSP: Bluetooth/AllowDiscoverableMode, Block bluetooth discoverability Test attack surface reduction (ASR) rules, Enable attack surface reduction (ASR) rules, Operationalize attack surface reduction (ASR) rules, Attack surface reduction (ASR) rules reference, Demystifying attack surface reduction rules - Part 1, Demystifying attack surface reduction rules - Part 2, Demystifying attack surface reduction rules - Part 3, Demystifying attack surface reduction rules - Part 4, Use attack surface reduction rules to prevent malware infection, Enable attack surface reduction rules - alternate configurations, Address false positives/negatives in Microsoft Defender for Endpoint, Cloud-delivered protection and Microsoft Defender Antivirus, Turn on cloud-delivered protection in Microsoft Defender Antivirus, Configure and validate exclusions based on extension, name, or location, Microsoft Defender Antivirus platform support, Overview of inventory in the Microsoft 365 Apps admin center, Use role-based access control (RBAC) and scope tags for distributed IT in Intune, Assign device profiles in Microsoft Intune, More info about Internet Explorer and Microsoft Edge, Block credential stealing from the Windows local security authority subsystem (lsass.exe), Block abuse of exploited vulnerable signed drivers, Block persistence through Windows Management Instrumentation (WMI) event subscription, Minimum requirements for Microsoft Defender for Endpoint, Block executable files from running unless they meet a prevalence (1000 machines), age, or trusted list criteria, Block process creations originating from PSExec and WMI commands, Block Office apps from creating executable content, Block executable content from email client and webmail, Block untrusted and unsigned processes that run from USB, Block Office apps from creating child processes, Block only Office communication applications from creating child processes, Block JS/VBS from launching downloaded executable content, Use advanced protection against ransomware, Block persistence through WMI event subscription, Block Office apps from injecting code into other processes, Block Office communication apps from creating child processes, Block Adobe Reader from creating child processes, 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, attack surface reduction rules best practices, Microsoft Defender for Endpoint E5 or Windows E5 licenses, Passive Mode with Endpoint detection and response (EDR) in Block Mode. . Microsoft Defender Antivirus exclusions apply to some Microsoft Defender for Endpoint capabilities, such as some of the attack surface reduction (ASR) rules. In Create a profile, in the following two drop-down lists, select the following: The Custom template tool opens to step 1 Basics. Profiles include: Policy merge helps avoid conflicts when multiple profiles that apply to the same device configure the same setting with different values, creating a conflict. CSP: ControlledFolderAccessAllowedApplications. Protect devices from exploits, This ASR rule is controlled via the following GUID: 3B576869-A4EC-4529-8536-B80A7769E899, Block all Office applications from creating child processes Block hardware device installation by device instance identifiers However, consider using each rule for either reusable settings groups or to manage settings you add directly to the rule. Now the Server SKU will be marked as compliant for an Attack Surface Reduction rule, only after enforcement of the rule. Only the settings that aren't in conflict are merged, while those that are in conflict aren't added to the superset of rules. Protect devices from exploits, This ASR rule is controlled via the following GUID: 75668C1F-73B5-4CF0-BB93-3ECF5CB7CC84, Block Office applications from creating executable content Enable attack surface reduction rules - GitHub When set to Enabled for Edge or Enabled for Edge AND isolated Windows environments, the following settings are available, which apply to Edge: Clipboard behavior 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. Next, open the Configure Attack Surface Reduction rules policy and add a GUID for each ASR rule you want to configure in the Value name, and the desired state under value. Policy merge doesnt compare or merge the configurations from different settings. Executable files and scripts used in Office apps or web mail that attempt to download or run files. CSP: EnableControlledFolderAccess, List of additional folders that need to be protected An exclusion is applied only when the excluded application or service starts. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. Attack surface reduction rules in WindowsServer2012R2 and WindowsServer2016 are available for devices onboarded using the modern unified solution package. Intune endpoint security Attack surface reduction settings ! Block execution of potentially obfuscated scripts (js/vbs/ps) Troubleshoot problems with attack surface reduction rules Attack Surface Reduction rules. In-the-wild, vulnerable signed drivers can be exploited by local applications - that have sufficient privileges - to gain access to the kernel. Configuration Manager: Block executable content download from email and webmail clients. Jan 11, 2021 -- 1 This blog post provides a set of recommendations based on the audit data Palantir's Infosec team has collected from the Windows Defender Attack Surface Reduction (ASR) family of security controls over the past two years. In some apps, the code enumerates all running processes and attempts to open them with exhaustive permissions. OMA-URI path: ./Vendor/MSFT/Policy/Config/Defender/AttackSurfaceReductionRules, Value: 75668c1f-73b5-4cf0-bb93-3ecf5cb7cc84=2|3b576869-a4ec-4529-8536-b80a7769e899=1|d4f940ab-401b-4efc-aadc-ad5f3c50688a=2|d3e037e1-3eb8-44c8-a917-57927947596d=1|5beb7efe-fd9a-4556-801d-275e5ffc04cc=0|be9ba2d9-53ea-4cdc-84e5-9b1eeee46550=1. CSP: SmartScreen/PreventOverrideForFilesInShell, Turn on Windows SmartScreen Defender for Endpoint includes several capabilities to help reduce your attack surfaces. Attack surface reduction rule merge behavior is as follows: Device Control With settings for device control, you can configure devices for a layered approach to secure removable media. Open the Configure Attack Surface Reduction Rules. ASR rules are somehow overlooked by many organizations. The following table lists the supported operating systems for rules that are currently released to general availability. These cloud protection services, also referred to as Microsoft Advanced Protection Service (MAPS), enhances standard real-time protection, arguably providing the best antivirus defense. CSP: RemovableDiskDenyWriteAccess, Scan removable drives during full scan You can also select Import to import a CSV file that contains files and folders to exclude from ASR rules. After the profile is created, any devices to which the policy should apply will have Microsoft Defender Application Guard enabled. In the Endpoint protection pane, select Windows Defender Exploit Guard, then select Attack Surface Reduction. Attack surface reduction rules from the following profiles are evaluated for each device the rules apply to: Devices > Configuration policy > Endpoint protection profile > Microsoft Defender Exploit Guard >, Endpoint security > Attack surface reduction policy >, Endpoint security > Security baselines > Microsoft Defender for Endpoint Baseline >. In this blog post, I will go through some of the rules and show how to bypass them. The result is a single list for each of the supported settings being applied to a device. To learn more about this setting, see Block persistence through WMI event subscription. Intune (Configuration Profiles): Execution of executable content (exe, dll, ps, js, vbs, etc.) Reducing your attack surface means protecting your organization's devices and network, which leaves attackers with fewer ways to attack. Attack surface reduction policy for endpoint security in Intune Select Device configuration > Profiles. Step 2 Configuration settings opens. Select the desired setting for each ASR rule. How to enable attack surface reduction rules from Intune?Deployment method and modes for Attack Surface Reduction Rules - https://youtu.be/dLrn6w5kzFAWhat is. Define a list of disk locations that will be protected from untrusted applications. Is there anything to whitelist here, or should I just enable the rule in "Block mode"? Attack surface reduction policies help reduce your attack surfaces, by minimizing the places where your organization is vulnerable to cyberthreats and attacks. You can use Microsoft Intune OMA-URI to configure custom ASR rules. 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). Cloud protection is critical to preventing breaches from malware and a critical component of ASR rules. Users can select OK to enforce the block, or select the bypass option - Unblock - through the end-user pop-up toast notification that is generated at the time of the block. There's a risk of malware abusing functionality of PsExec and WMI for command and control purposes, or to spread an infection throughout an organization's network. Office VBA enables Win32 API calls. You can also select Import to import a CSV file that contains files and folders to exclude from ASR rules. Profiles created after that date use a new settings format as found in the Settings Catalog. This rule blocks Office apps from creating child processes. Disable Auto detection of other enterprise proxy servers, Disable Auto detection of other enterprise IP ranges.