This rule doesn't block files that have one or more of the following characteristics: The rule tends to err on the side of caution to prevent ransomware. Kernel DMA Protection is a platform feature that must be supported by the system at the time of manufacturing. 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. Overview of Attack Surface Reduction Rules in Intune - Prajwal Desai Settings that don't have conflicts are added to a superset of policy for the device. Expand the dropdown, select Add, and then specify an IP address or FQDN and a Proxy. How to Configure Attack Surface Reduction (ASR) Rules using MEM In the Endpoint protection pane, select Windows Defender Exploit Guard, then select Attack Surface Reduction. 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. Refer to the MDM section in this article for the OMA-URI to use for this example rule. However, Chrome should not be accessing local device lsass.exe. With this example, a setup class defined in the blocklist will override the same setup class if found on the allowlist. Microsoft Defender Antivirus works seamlessly with Microsoft cloud services. In the following example, the first two rules will be enabled, the third rule will be disabled, and the fourth rule will be enabled in audit mode: You can also use the Add-MpPreference PowerShell verb to add new rules to the existing list. "User Defined" allows a local admin user to configure the rule. After the profile is created, any devices to which the policy should apply will have Microsoft Defender Application Guard enabled. After 24 hours, the end-user will need to allow the block again. CSP: AllowInstallationOfMatchingDeviceIDs. If you've chosen an existing profile, select Properties and then select Settings. Typically, you can enable the standard protection rules with minimal-to-no noticeable impact to the end user. Do one of the following: In step 4 Assignments, in Included Groups, for the groups that you want this rule to apply, select from the following options: In Excluded groups, select any groups that you want to exclude from this rule, and then select Next. CSP: ControlledFolderAccessProtectedFolders. Expand the dropdown, select Add, and then specify Internal proxy servers. Fileless threats employ various tactics to stay hidden, to avoid being seen in the file system, and to gain periodic execution control. Support for devices managed by Configuration Manager is in Preview. When you use a .CSV file, each thumbprint must be separated by a comma. Block external content from non-enterprise approved sites Users can choose to bypass the block warning message and allow the underlying action. CSP: DataProtection/AllowDirectMemoryAccess. 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. Expand the tree to Windows components > Microsoft Defender Antivirus > Microsoft Defender Exploit Guard > Attack surface reduction. Type powershell in the Start menu, right-click Windows PowerShell and select Run as administrator. The keystone to good security hygiene is limiting your attack surface. Group Policy: Block executable content from email client and webmail. CSP: BlockNonEnterpriseContent, Collect logs for events that occur within an Application Guard browsing session Files copied from the USB to the disk drive will be blocked by this rule if and when it's about to be executed on the disk drive. Following is a list of ASR rules that honor Microsoft Defender Antivirus exclusions: For information about configuring per-rule exclusions, see the section titled Configure ASR rules per-rule exclusions in the topic Test attack surface reduction (ASR) rules. For an easy method to enable the standard protection rules, see: Simplified standard protection option. Web protection stops access to: To learn more, see Web protection in the Microsoft Defender for Endpoint documentation. 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. To avoid conflicts, Intune evaluates the applicable settings from each profile that applies to the device. It is more difficult to deploy ASR rules if code signing is not enforced. Microsoft Defender for Endpoint: Push ASR rules with Security Settings See, When deployed through Group Policy or PowerShell, exclusions apply to all ASR rules. Settings that aren't in conflict are merged, while settings that are in conflict aren't added to the superset of rules. This appears to be very easy in InTune, but InTune is not ready for production. Intune name: Office apps/macros creating executable content, SCCM name: Block Office applications from creating executable content, GUID: 3b576869-a4ec-4529-8536-b80a7769e899, Dependencies: Microsoft Defender Antivirus, RPC. Exclusions in Attack Surface Reduction rules in Block mode CSP: SaveFilesToHost, Application Guard allow camera and microphone access Some organizations can't enable Credential Guard on all of their computers because of compatibility issues with custom smartcard drivers or other programs that load into the Local Security Authority (LSA). Configure all Attack Surface Reduction Rules via custom configuration Attack surface reduction rules only work on devices with the following conditions: Endpoints are running Windows 10 Enterprise, version 1709 (also known as the Fall Creators Update). How to Use Group Policy for Windows Attack Surface Reduction Endpoint security > Attach surface reduction > Windows 10 and later (ConfigMgr), Attack Surface Reduction Rules (ConfigMgr), Configuration Manager current branch version 2006 or later. To learn more, see Attack surface reduction rules in the Microsoft Defender for Endpoint documentation. (2) Some ASR rules generate considerable noise, but won't block functionality. Step 2 Configuration settings opens. When the allow button is clicked, the block will be suppressed for 24 hours. Intune name: Untrusted and unsigned processes that run from USB, Configuration Manager name: Block untrusted and unsigned processes that run from USB, GUID: b2b3f03d-6a65-4f7b-a9c7-1c7ef74a9ba4. Configure certificate thumbprints to automatically transfer the matching root certificate to the Microsoft Defender Application Guard container. The file has already been found to be unharmful in the Microsoft cloud. It uses both client and cloud heuristics to determine whether a file resembles ransomware. CSP: AllowVirtualGPU, Allow users to download files onto the host Select Device configuration > Profiles. For information about the types of rights that are typically requested in process calls to LSASS, see: Process Security and Access Rights. Select Home > Create Exploit Guard Policy. Select "Configure Attack surface reduction rules" and select "Enabled". Sites that you've blocked in your custom indicator list. 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 This rule blocks the following file types from launching from email opened within the Microsoft Outlook application, or Outlook.com and other popular webmail providers: Intune name: Execution of executable content (exe, dll, ps, js, vbs, etc.) For more information, see Onboard Windows Servers to the Defender for Endpoint service. CSP: SmartScreen/EnableSmartScreenInShell. Although not common, line-of-business applications sometimes use scripts to download and launch installers. Microsoft Defender Antivirus exclusions apply to some Microsoft Defender for Endpoint capabilities, such as some of the attack surface reduction (ASR) rules. For attack surface reduction rule GUIDS, see Per rule descriptions in the article: Attack surface reduction rules. If you are using a different infrastructure configuration than what is listed for Infrastructure requirements (above), you can learn more about deploying attack surface reduction rules using other configurations here: Enable attack surface reduction rules. Namely ASRs rules or Attarck Surface Reduction rules. This separation can help simplify future configurations or changes you might make. Executable files and scripts used in Office apps or web mail that attempt to download or run files. To check if the system supports Kernel DMA Protection, check the Kernel DMA Protection field in the Summary page of MSINFO32.exe. As this rule setting becomes available to Server SKU, it's enforced through Config Manager. CSP: EnableNetworkProtection, Require SmartScreen for Microsoft Edge Fileless threats employ various tactics to stay hidden, to avoid being seen in the file system, and to gain periodic execution control. Tampering is the general term used to describe attackers attempts to impair the effectiveness of Microsoft Defender for Endpoint. It allows for more control over the enumeration of external DMA capable devices incompatible with DMA Remapping/device memory isolation and sandboxing. This deployment collection provides information about the following aspects of MDE ASR rules: As with any new, wide-scale implementation which could potentially impact your line-of-business operations, it is important to be methodical in your planning and implementation. Attack surface reduction rules (ASR rules) help prevent actions that malware often abuses to compromise devices and networks. Protect devices from exploits, Block Adobe Reader from creating child processes Select OK on the three configuration panes. there are 16 ASR rules currently that can be enabled (assuming the paid version of defender) via GPO or Intune MDM Set up of tenant attach includes configuring Configuration Manager device collections to support endpoint security policies from Intune. My question is without using some hash or application GUID, what is to stop someone from simply renaming a file or placing it within an excluded path? See Intune OMA-URI for configuring custom rules. Intune name: Process creation from Office communication products (beta), Configuration Manager name: Not available, GUID: 26190899-1602-49e8-8b27-eb1d0a1ce869. Behaviors that apps don't usually start during normal day-to-day work dropped from email (webmail/mail client) (no exceptions). memdocs/endpoint-protection-windows-10.md at main - GitHub Recommendations for deploying the latest Attack surface reduction rules To learn more, see How to control USB devices and other removable media using Microsoft Defender for Endpoint in the Microsoft Defender for Endpoint documentation. Executable files and scripts used in Office apps or web mail that attempt to download or run files, Obfuscated or otherwise suspicious scripts. CSP: Browser/AllowSmartScreen, Prevent Smart Screen Prompt Override For Files (Device) In this post, you will learn how to Block Vulnerable Signed Drivers Using Intune ASR Rules. Expand the dropdown, select Add, and then specify a lower address and then an upper address. Block Vulnerable Signed Drivers Using Intune ASR Rules Protect devices from exploits, This ASR rule is controlled via the following GUID: D3E037E1-3EB8-44C8-A917-57927947596D, Block process creations originating from PSExec and WMI commands 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. Using the Set-MpPreference cmdlet will overwrite the existing list. Protect devices from exploits, This ASR rule is controlled via the following GUID: 5BEB7EFE-FD9A-4556-801D-275E5FFC04CC, Block JavaScript or VBScript from launching downloaded executable content For OMA-URI Settings, click Add. Attack Surface Reduction Rule Exclusions. The block access to lsass rule will block unnecessary calls to lsass, but won't block the application from running. CSP: RemovableDiskDenyWriteAccess, Scan removable drives during full scan All entries that are listed in the profile are active. Attack surface reduction rules in WindowsServer2012R2 and WindowsServer2016 are available for devices onboarded using the modern unified solution package. For more details on the current versions and how to update the different Microsoft Defender Antivirus components visit Microsoft Defender Antivirus platform support. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. Creating malicious child processes is a common malware strategy. 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. An Attack surface reduction policy, named: ACSC Windows Hardening Guidelines-Attack Surface Reduction. Enterprise-level management overwrites any conflicting Group Policy or PowerShell settings on startup. CSP: Browser/PreventSmartScreenPromptOverrideForFiles, Disallow Exploit Protection Override In Custom, select Next. If you enable the rule to block access to lsass, it will generate a lot of events. Web protection (Microsoft Edge Legacy) Settings you can manage for Web protection in Microsoft Defender for Endpoint configure network protection to secure your machines against web threats. Only the settings that aren't in conflict are merged, while those that are in conflict aren't added to the superset of rules. Configuration possibilities There are several options available to configure the Attack Surface Reduction rules. This occurs because devices receive a superset of attack surface reduction rule settings from all applicable policies, and the settings exclusions can't be managed for individual settings. Allow hardware device installation by device identifiers, Block hardware device installation by device identifiers, Allow hardware device installation by setup classes, Block hardware device installation by setup classes, Allow hardware device installation by device instance identifiers, Block hardware device installation by device instance identifiers, Instead, the device receives both lists, as they are from two distinct settings. Enables the IT admin to push out a configuration representing the desired system and application mitigation options to all the devices in the organization. These malicious components would survive a computer reboot and persist on the system. Your previously created instances of these profiles remain available to use and edit, but all new instances you create will be in the new format. For Customers who are using a non-Microsoft HIPS and are transitioning to Microsoft Defender for Endpoint attack surface reduction rules: Microsoft advises customers to run their HIPS solution side-by-side with their ASR rules deployment until the moment you shift from Audit to Block mode. Sign up for a free trial. When viewing a settings information text, you can use its Learn more link to open that content. For example: View the settings you can configure in profiles for Attack surface reduction policy in the endpoint security node of Intune as part of an Endpoint security policy. ! The following Microsoft Defender Antivirus component versions must be no more than two versions older than the most-currently-available version: Keeping Microsoft Defender Antivirus versions current helps reduce ASR rules false positive results and improves Microsoft Defender Antivirus detection capabilities. Intune name: Executables that don't meet a prevalence, age, or trusted list criteria, Configuration Manager name: Block executable files from running unless they meet a prevalence, age, or trusted list criteria, GUID: 01443614-cd74-433a-b99e-2ecdc07bfc25, Dependencies: Microsoft Defender Antivirus, Cloud Protection. This release will allow all Defender for Endpoint managed devices to receive ASR rules via Microsoft Intune. Only the configurations for conflicting settings are held back. 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. Protect devices from exploits, This ASR rule is controlled via the following GUID: 92E97FA1-2EDF-4476-BDD6-9DD0B4DDDC7B, Block Office communication apps from creating child processes The "Add Exclusions" button takes you right to Microsoft Defender for Endpoint > Attack Surface Reduction Profiles. 6: Warn (Enable the ASR rule but allow the end-user to bypass the block). By default, they're not configured, so you're not protected against more sophisticated attacks! Block credential stealing from the Windows local security authority subsystem (lsass.exe) This policy can provide additional security against external DMA capable devices. Non-conflicting rules will not result in an error, and the rule will be applied correctly. Windows 10, Windows 11, and Windows Server: Use this platform for policy you deploy to devices managed through Security Management for Microsoft Defender for Endpoint. Want to experience Defender for Endpoint? This rule detects suspicious properties within an obfuscated script. Cloud resources ASR rules are somehow overlooked by many organizations. Find the endpoint security policies for attack surface reduction under Manage in the Endpoint security node of the Microsoft Intune admin center. This rule prevents attacks by blocking Adobe Reader from creating processes. App locker application control Protect devices from exploits, This ASR rule is controlled via the following GUID: c1db55ab-c21a-4637-bb3f-a12568109d35, Enable folder protection This rule prevents scripts from launching potentially malicious downloaded content. This means that even if an ASR rule determines the file or folder contains malicious behavior, it doesn't block the file from running. Attack Surface Reduction Rule Exclusions : r/Intune - Reddit Test attack surface reduction (ASR) rules | Microsoft Learn Protect devices from exploits, This ASR rule is controlled via the following GUID: d1e49aac-8f56-4280-b9ba-993a6d77406c, Block untrusted and unsigned processes that run from USB The following procedure uses the rule Block abuse of exploited vulnerable signed drivers for the example. microsoft/Intune-ACSC-Windows-Hardening-Guidelines Two options now appear: Add and Export. In this blog, we discuss the two attack surface reduction rules introduced in the most recent release of Windows and cover suggested deployment methods and best practices. You can use Microsoft Intune OMA-URI to configure custom ASR rules. The warn mode for ASR rules is only supported for RS5+ (1809+) devices. Attack surface reduction rules for managed devices now support behavior for merger of settings from different policies, to create a superset of policy for each device. Choose Select XML File, specify the XML filet upload, and then click Select. By default, ASR Only Per Rule Exclusions is set to Not configured. If ASR rules are detecting files that you believe shouldn't be detected, you should use audit mode first to test the rule. This article provides information about Microsoft Defender for Endpoint attack surface reduction (ASR) rules: ASR rules are categorized as one of two types: For the easiest method to enable the standard protection rules, see: Simplified standard protection option. If you use this setting, AppLocker CSP behavior currently prompts end user to reboot their machine when a policy is deployed. For Attack surface reduction policy, the following profiles support policy merge: Device control profiles support policy merge for USB Device IDs. Reducing your attack surface means offering attackers fewer ways to perform attacks. 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. This rule blocks Office apps from creating child processes. Script obfuscation is a common technique that both malware authors and legitimate applications use to hide intellectual property or decrease script loading times. The file is prevalent enough to not be considered as ransomware. As you might have guessed, the answer is: it depends! To allow users to define the value using PowerShell, use the "User Defined" option for the rule in the management platform. Some threats can abuse the WMI repository and event model to stay hidden. The rule Block executable content from email client and webmail has the following alternative descriptions, depending on which application you use: This rule blocks executable files, such as .exe, .dll, or .scr, from launching. With this change you can no longer create new versions of the old profile and they are no longer being developed. Enable attack surface reduction rules - GitHub Protect devices from exploits. Profiles created after that date use a new settings format as found in the Settings Catalog. Each rule you add to the profile can include both reusable settings groups and individual settings that are added directly to the rule. 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. 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). Choose which rules will block or audit actions and select Next. Select Show and enter each file or folder in the Value name column. Endpoints are using Microsoft Defender Antivirus as the sole antivirus protection app. Select Show and enter the rule ID in the Value name column and your chosen state in the Value column as follows: To exclude files and folders from ASR rules, select the Exclude files and paths from Attack surface reduction rules setting and set the option to Enabled. For example: This rule prevents an application from writing a vulnerable signed driver to disk. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. Choose an existing endpoint protection profile or create a new one. In public preview, Device control profiles support use of reusable settings groups to help manage settings for the following settings groups on devices for the Windows 10 and later platform: The following device control profile settings are available for printer device: The following device control profile settings are available in for removable storage: For information about these options, see the following articles in the Microsoft Defender for Endpoint documentation: When you configure a Device control profile and one or more reusable settings groups, you also configure Actions to define how the settings in those groups are used. CSP: AllowCameraMicrophoneRedirection, Application guard allow print to local printers, Application guard allow print to network printers, Application Guard allow use of Root Certificate Authorities from the user's device Testing Microsoft Defender for Endpoint (MDE) attack surface reduction (ASR) rules helps you determine if rules will impede line-of-business operations prior to enabling any rule. You use the Windows Security app or PowerShell to create a set of mitigations (known as a configuration). Microsoft Defender for Endpoint provides multiple monitoring and control features to help prevent threats in unauthorized peripherals from compromising your devices. This rule protects against social engineering attacks and prevents exploiting code from abusing vulnerabilities in Outlook. dropped from email (webmail/mail client) (no exceptions), Microsoft Configuration Manager name: Block executable content from email client and webmail, GUID: be9ba2d9-53ea-4cdc-84e5-9b1eeee46550. Rules are active and live within minutes. These advanced capabilities aren't available with an E3 license, but you can still use Event Viewer to review attack surface reduction rule events. The Attack Surface Reduction rules are rules to lock down various attack vectors commonly used in malware. And that's because there are multiple ways to configure ASR rules. Only the configurations for conflicting settings are held back. Some rules don't work well if un-signed, internally developed application and scripts are in high usage. The vulnerable driver ASR rule can be enabled and configured using Intune, mobile device management (MDM), Microsoft Endpoint Configuration Manager, Group Policy, and PowerShell. Although multiple methods of implementing ASR rules are possible, this guide is based on an infrastructure consisting of. Expanding support for Attack surface reduction rules with Microsoft Intune By Intune Support Team Published Feb 06 2023 08:00 AM 10.5K Views Skip to footer content By Laura Arrizza, Product Manager and Amit Ghodke, Principal Product Manager Architect | Microsoft Intune Use Add-MpPreference to append or add apps to the list. Required version of Configuration Manager: Supported Configuration Manager device platforms: Profiles for this platform can be used with Windows 10 and Windows 11 devices enrolled with Intune, and with devices managed through Security Management for Microsoft Defender for Endpoint. Some threats can abuse the WMI repository and event model to stay hidden. For guidance on configuring reusable groups, and then adding them to this profile, see Use reusable groups of settings with Intune policies. CSP: ClipboardSettings. Attack surface reduction rules reference | Microsoft Learn