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defender-endpoint/attack-surface-reduction-rules-reference.md

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audience: ITPro
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author: denisebmsft
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ms.author: deniseb
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ms.reviewer: sugamar, niwelton
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ms.reviewer: sugamar, yongrhee
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manager: deniseb
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ms.custom: asr
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ms.topic: reference
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ms.collection:
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- m365-security
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- tier2
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- mde-asr
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ms.date: 09/07/2024
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ms.date: 10/07/2024
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search.appverid: met150
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---
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The following table lists the supported operating systems for rules that are currently released to general availability. The rules are listed alphabetical order in this table.
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> [!NOTE]
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> Unless otherwise indicated, the minimum Windows 10 build is version 1709 (RS3, build 16299) or later; the minimum Windows Server build is version 1809 or later.
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> Unless otherwise indicated, the minimum Windows10 build is version 1709 (RS3, build 16299) or later; the minimum WindowsServer build is version 1809 or later.
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>
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> Attack surface reduction rules in Windows Server 2012 R2 and Windows Server 2016 are available for devices onboarded using the modern unified solution package. For more information, see [New Windows Server 2012 R2 and 2016 functionality in the modern unified solution](configure-server-endpoints.md#functionality-in-the-modern-unified-solution).
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> Attack surface reduction rules in WindowsServer2012R2 and WindowsServer2016 are available for devices onboarded using the modern unified solution package. For more information, see [New Windows Server 2012 R2 and 2016 functionality in the modern unified solution](configure-server-endpoints.md#functionality-in-the-modern-unified-solution).
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| Rule name| Windows&nbsp;11 <br>and<br> Windows&nbsp;10 | Windows&nbsp;Server <br> 2022 <br>and<br> Windows&nbsp;Server <br> 2019 | Windows Server | Windows&nbsp;Server <br> 2016 <sup>[[1, 2](#fn1)]</sup> | Windows&nbsp;Server <br> 2012&nbsp;R2 <sup>[[1, 2](#fn1)]</sup> |
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| Rule name| Windows11 <br>and<br> Windows10 | WindowsServer <br> 2022 <br>and<br> WindowsServer <br> 2019 | Windows Server | WindowsServer <br> 2016 <sup>[[1, 2](#fn1)]</sup> | WindowsServer <br> 2012R2 <sup>[[1, 2](#fn1)]</sup> |
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|:---|:---:|:---:|:---:|:---:|:---:|
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| [Block abuse of exploited vulnerable signed drivers](#block-abuse-of-exploited-vulnerable-signed-drivers) | Y | Y | Y <br> version 1803 (Semi-Annual Enterprise Channel) or later | Y | Y |
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| [Block Adobe Reader from creating child processes](#block-adobe-reader-from-creating-child-processes) | Y <br> version 1809 or later <sup>[[3](#fn1)]</sup> | Y | Y | Y | Y |
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(<a id="fn1">1</a>) Refers to the modern unified solution for Windows Server 2012 and 2016. For more information, see [Onboard Windows Servers to the Defender for Endpoint service](configure-server-endpoints.md).
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(<a id="fn1">2</a>) For Windows&nbsp;Server 2016 and Windows&nbsp;Server 2012&nbsp;R2, the minimum required version of Microsoft Endpoint Configuration Manager is version 2111.
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(<a id="fn1">2</a>) For WindowsServer 2016 and WindowsServer 2012R2, the minimum required version of Microsoft Endpoint Configuration Manager is version 2111.
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(<a id="fn1">3</a>) Version and build number apply only to Windows&nbsp;10.
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(<a id="fn1">3</a>) Version and build number apply only to Windows10.
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## ASR rules supported configuration management systems
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For rules with the "Rule State" specified:
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- ASR rules with \<ASR Rule, Rule State\> combinations are used to surface alerts (toast notifications) on Microsoft Defender for Endpoint only for devices at cloud block level **High**. Devices not at High cloud block level won't generate alerts for any <ASR Rule, Rule State> combinations
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- EDR alerts are generated for ASR rules in the specified states, for devices at cloud block level **High+**
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- ASR rules with `\ASR Rule, Rule State\` combinations are used to surface alerts (toast notifications) on Microsoft Defender for Endpoint only for devices at cloud block level "High".
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- Devices that not at the high cloud block level don't generate alerts for any `ASR Rule, Rule State` combinations
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- EDR alerts are generated for ASR rules in the specified states, for devices at cloud block level "High+"
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- Toast notifications occur in block mode only and for devices at cloud block level "High"
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| Rule name: | Rule state: | Generates alerts in EDR? <br> (Yes&nbsp;\|&nbsp;No) | Generates toast notifications? <br> (Yes&nbsp;\|&nbsp;No) |
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|---|:---:|:---:|:---:|
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| | | _Only for devices at cloud block level **High+**_ | _In Block mode only_ and _only for devices at cloud block level **High**_|
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| Rule name | Rule state | EDR alerts | Toast notifications |
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|---|---|---|---|
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|[Block abuse of exploited vulnerable signed drivers](#block-abuse-of-exploited-vulnerable-signed-drivers) | | N | Y |
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|[Block Adobe Reader from creating child processes](#block-adobe-reader-from-creating-child-processes) | Block | Y | Y |
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|[Block all Office applications from creating child processes](#block-all-office-applications-from-creating-child-processes) | | N | Y |
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|[Block credential stealing from the Windows local security authority subsystem (lsass.exe)](#block-credential-stealing-from-the-windows-local-security-authority-subsystem) | | N | Y |
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|[Block credential stealing from the Windows local security authority subsystem (lsass.exe)](#block-credential-stealing-from-the-windows-local-security-authority-subsystem) | | N | N |
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|[Block executable content from email client and webmail](#block-executable-content-from-email-client-and-webmail) | | Y | Y |
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|[Block executable files from running unless they meet a prevalence, age, or trusted list criterion](#block-executable-files-from-running-unless-they-meet-a-prevalence-age-or-trusted-list-criterion) | | N | Y |
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|[Block execution of potentially obfuscated scripts](#block-execution-of-potentially-obfuscated-scripts) | Audit&nbsp;\|&nbsp;Block | Y \| Y | N \| Y |
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|[Block execution of potentially obfuscated scripts](#block-execution-of-potentially-obfuscated-scripts) | Audit or Block | Y (in block mode) <br/>N (in audit mode) | Y (in block mode) |
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|[Block JavaScript or VBScript from launching downloaded executable content](#block-javascript-or-vbscript-from-launching-downloaded-executable-content) | Block | Y | Y |
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|[Block Office applications from creating executable content](#block-office-applications-from-creating-executable-content) | | N | Y |
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|[Block Office applications from injecting code into other processes](#block-office-applications-from-injecting-code-into-other-processes) | | N | Y |
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|[Block Office communication application from creating child processes](#block-office-communication-application-from-creating-child-processes) | | N | Y |
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|[Block persistence through WMI event subscription](#block-persistence-through-wmi-event-subscription) | Audit&nbsp;\|&nbsp;Block | Y \| Y | N \| Y |
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|[Block persistence through WMI event subscription](#block-persistence-through-wmi-event-subscription) | Audit or Block | Y (in block mode) <br/> N (in audit mode) | Y (in block mode) |
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|[Block process creations originating from PSExec and WMI commands](#block-process-creations-originating-from-psexec-and-wmi-commands) | | N | Y |
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|[Block rebooting machine in Safe Mode (preview)](#block-rebooting-machine-in-safe-mode-preview) | | N | N |
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|[Block untrusted and unsigned processes that run from USB](#block-untrusted-and-unsigned-processes-that-run-from-usb) | Audit&nbsp;\|&nbsp;Block | Y \| Y | N \| Y |
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|[Block untrusted and unsigned processes that run from USB](#block-untrusted-and-unsigned-processes-that-run-from-usb) | Audit or Block | Y (in block mode) <br/> N (in audit mode) | Y (in block mode) |
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|[Block use of copied or impersonated system tools (preview)](#block-use-of-copied-or-impersonated-system-tools-preview) | | N | N |
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|[Block Webshell creation for Servers](#block-webshell-creation-for-servers) | | N | N |
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|[Block Win32 API calls from Office macros](#block-win32-api-calls-from-office-macros) | | N | Y |
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|[Use advanced protection against ransomware](#use-advanced-protection-against-ransomware) | Audit&nbsp;\|&nbsp;Block | Y \| Y | N \| Y |
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|[Use advanced protection against ransomware](#use-advanced-protection-against-ransomware) | Audit or Block | Y (in block mode) <br/> N (in audit mode) | Y (in block mode) |
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## ASR rule to GUID matrix
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_Warn mode_ is a block-mode type that alerts users about potentially risky actions. Users can choose to bypass the block warning message and allow the underlying action. 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. After the warning is unblocked, the operation is allowed until the next time the warning message occurs, at which time the end-user will need to reperform the action.
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When the allow button is clicked, the block is suppressed for 24 hours. After 24 hours, the end-user will need to allow the block again. The warn mode for ASR rules is only supported for RS5+ (1809+) devices. If bypass is assigned to ASR rules on devices with older versions, the rule will be in blocked mode.
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When the allow button is clicked, the block is suppressed for 24 hours. After 24 hours, the end-user will need to allow the block again. The warn mode for ASR rules is only supported for RS5+ (1809+) devices. If bypass is assigned to ASR rules on devices with older versions, the rule is in blocked mode.
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You can also set a rule in warn mode via PowerShell by specifying the AttackSurfaceReductionRules_Actions as "Warn". For example:
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You can also set a rule in warn mode via PowerShell by specifying the `AttackSurfaceReductionRules_Actions` as "Warn". For example:
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```powershell
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Add-MpPreference -AttackSurfaceReductionRules_Ids 56a863a9-875e-4185-98a7-b882c64b5ce5 -AttackSurfaceReductionRules_Actions Warn

defender-endpoint/manage-gradual-rollout.md

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# Manage the gradual rollout process for Microsoft Defender updates
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### Update channels for security intelligence updates
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You can also assign a machine to a channel to define the cadence in which it receives SIUs (formerly referred to as signature, definition, or daily updates). Unlike the monthly process, there's no Beta channel and this gradual release cycle occurs multiple times a day.
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You can also assign a machine to a channel to define the cadence in which it receives SIUs (formerly referred to as signature, definition, or daily updates). Unlike the monthly process, this gradual release cycle occurs multiple times a day.
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|Channel name|Description|Application|
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|---|---|---|

defender-endpoint/microsoft-defender-endpoint-linux.md

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# Microsoft Defender for Endpoint on Linux
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- SUSE Linux Enterprise Server 12 or higher
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- SUSE Linux Enterprise Server 15 or higher
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- SUSE Linux Enterprise Server 12.x
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- SUSE Linux Enterprise Server 15.x
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- Oracle Linux 7.2 or higher
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- Oracle Linux 8.x
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- Oracle Linux 9.x

defender-for-iot/whats-new.md

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|Service area |Updates |
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| **OT networks** | - [New Building Management Systems (BMS) device category](#new-building-management-systems-bms-device-category) |
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| **OT networks** | - [Review unmanaged enterprise IoT devices in Microsoft Security Exposure Management Initiatives page](#review-unmanaged-enterprise-iot-devices-in-microsoft-security-exposure-management-initiatives-page)<br>- [New Building Management Systems (BMS) device category](#new-building-management-systems-bms-device-category)|
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### Review unmanaged enterprise IoT devices in Microsoft Security Exposure Management Initiatives page
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You can now review the new Enterprise IoT Security initiative in the Microsoft Security Exposure Management Initiatives page. This new initiative provides a metric-driven way of tracking exposure about unmanaged enterprise IoT devices.
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For more information, see the [Microsoft Security Exposure Management release notes](/security-exposure-management/whats-new#new-enterprise-iot-security-initiative).
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### New Building Management Systems (BMS) device category
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defender-office-365/quarantine-faq.yml

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If a third party filter isn't preventing the message from reaching the user's Inbox and the first release attempt didn't work, admins can try using the [Release-QuarantineMessage](/powershell/module/exchange/release-quarantinemessage) cmdlet in [Exchange Online PowerShell](/powershell/exchange/connect-to-exchange-online-powershell) with the _Force_ switch to release the message.
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If **Release-QuarantineMessage** with the _Force_ switch doesn't work, admins should try releasing the message to an alternate mailbox after filtering by the third party service is turned off.
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If **Release-QuarantineMessage** with the _Force_ switch doesn't work, admins should try releasing the message to an alternate mailbox after filtering by the third party service is turned off. Forced release might cause messages to be released multiple times.
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You receive an error if you try to bulk release multiple messages to all recipients and a recipient-level message delete was done on any of the messages. The admin needs to release that specific message only to the recipient where delete from quarantine has not occurred.
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- Inbox rules ([created by users in Outlook](https://support.microsoft.com/office/c24f5dea-9465-4df4-ad17-a50704d66c59) or by admins using the **\*-InboxRule** cmdlets in Exchange Online PowerShell) can move or delete messages from the Inbox.
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- Some mail flow rules that quarantined a message can cause the released message to be quarantined again.
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For bulk actions that are available on the **Quarantine** page, see [Take action on multiple quarantined email messages](quarantine-admin-manage-messages-files.md#take-action-on-multiple-quarantined-email-messages).
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In Defender for Office 365 Plan 2, you can use Explorer (Threat Explorer) to do larger bulk release operations (a maximum of 200,000 messages).
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> For messages quarantined by zero-hour auto purge (ZAP), quarantine notifications are generated based on when the message was quarantined, not when the message was delivered to the mailbox.
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