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Copy file name to clipboardExpand all lines: defender-endpoint/schedule-antivirus-scans-group-policy.md
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@@ -6,7 +6,7 @@ ms.localizationpriority: medium
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author: emmwalshh
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ms.author: ewalsh
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ms.custom: nextgen
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ms.date: 09/07/2024
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ms.date: 02/18/2025
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ms.reviewer: pauhijbr, ksarens
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manager: deniseb
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ms.subservice: ngp
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2. Right-click the Group Policy Object you want to configure, and then select **Edit**.
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3. Specify settings for the Group Policy Object, and then select **OK**.
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3. Specify the settings for the Group Policy Object, and then select **OK**.
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4. Repeat steps 1-4 for each setting you want to configure.
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5. Deploy your Group Policy Object as you normally do. If you need help with Group Policy Objects, see [Create a Group Policy Object](/windows/security/threat-protection/windows-firewall/create-a-group-policy-object).
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> [!NOTE]
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> When configuring scheduled scans, the setting **Start the scheduled scan only when computer is on but not in use**, which is enabled by default, can impact the expected scheduled time by requiring the machine to be idle first.
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> When configuring scheduled scans, the setting **Start the scheduled scan only when computer is on but not in use** (which is enabled by default) can affect the expected scheduled time by requiring the machine to be idle first.
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>
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> For weekly scans, default behavior on Windows Server is to scan outside of automatic maintenance when the machine is idle. The default on Windows 10 and later is to scan during automatic maintenance when the machine is idle. To change this behavior, modify the settings by disabling **ScanOnlyIfIdle**, and then define a schedule.
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> For weekly scans, the default behavior on Windows Server and Windows 10 and later, is to scan outside of the automatic maintenance when the machine is idle. To change this behavior, modify the settings by disabling **ScanOnlyIfIdle**, and then define a schedule.
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For more information, see the [Manage when protection updates should be downloaded and applied](manage-protection-update-schedule-microsoft-defender-antivirus.md) and [Prevent or allow users to locally modify policy settings](configure-local-policy-overrides-microsoft-defender-antivirus.md)topics.
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For more information, see the [Manage when protection updates should be downloaded and applied](manage-protection-update-schedule-microsoft-defender-antivirus.md) and [Prevent or allow users to locally modify policy settings](configure-local-policy-overrides-microsoft-defender-antivirus.md)articles.
| Scan | Specify the scan type to use for a scheduled scan | Quick scan ||
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| Scan | Specify the day of the week to run a scheduled scan | Specify the day (or never) to run a scan. | Never |
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| Scan | Specify the time of day to run a scheduled scan | Specify the number of minutes after midnight (for example, enter **60** for 1 a.m.). | 2 a.m. |
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| Root | Randomize scheduled task times |In Microsoft Defender Antivirus, randomize the start time of the scan to any interval from 0 to 23 hours. By default, scheduled tasks begin at a random time within four hours of the time specified in Task Scheduler. | Enabled |
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| Root | Configure scheduled task times randomization window | Allows you to configure scheduled task scan start time and the scheduled security intelligence update start time window in hours. This setting affects the Randomize scheduled task times configuration. If you enable this setting, you must pick a randomization window in hours. The possible randomization window interval is between 1 and 23 hours. The randomization interval implemented is between 0 and the configured value. When you enable this setting, Randomize scheduled task times settings uses the randomization window specified in this configuration setting. If you disable or do not configure this policy setting, Randomize scheduled task times settings will randomize scheduled task times between 0-4 hours. | Not configured (Disabled)|
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| Scan | Specify the time of day to run a scheduled scan | Specify the number of minutes after midnight to run a scan (for example, enter **60** for 1 a.m.). | 2 a.m. |
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| Root | Randomize scheduled task times |In Microsoft Defender Antivirus, randomize the start time of the scan to any interval from **0 to 23 hours**. By default, scheduled tasks begin at a random time within four hours of the time specified in Task Scheduler. | Enabled |
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| Root | Configure scheduled task times randomization window |- This setting lets you set the start time for scheduled task scans and security updates. <br> - When enabled, you can choose a randomization window between **1 and 23 hours**. <br> - The Randomize Scheduled Task Times uses the specified window. <br> - If disabled or not configured, it randomizes times between **0 and 4 hours**. | Not configured (Disabled)|
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## Group Policy settings for scheduling scans for when an endpoint isn't in use
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| Scan | Start the scheduled scan only when computer is on but not in use | Scheduled scans won't run, unless the computer is on but not in use | Enabled |
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> [!NOTE]
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> When you schedule scans for times when endpoints aren't in use, scans don't honor the CPU throttling configuration and will take full advantage of the resources available to complete the scan as fast as possible.
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> When you schedule scans for times when endpoints aren't in use, scans don't honor the CPU throttling configuration and takes full advantage of the resources available to complete the scan as fast as possible.
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## Group Policy settings for scheduling remediation-required scans
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| Scan | Specify the interval to run quick scans per day | Specify how many hours should elapse before the next quick scan. For example, to run every two hours, enter **2**, for once a day, enter **24**. Enter **0** to never run a daily quick scan. | Never |
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| Scan | Specify the time for a daily quick scan | Specify the number of minutes after midnight (for example, enter **60** for 1 a.m.) Note that if this setting is set to 0, daily quick scans do not run.| 2 a.m. |
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| Scan | Specify the time for a daily quick scan | Specify the number of minutes after midnight (for example, enter **60** for 1 a.m.) Note that if this setting is set to 0, daily quick scans don't run.| 2 a.m. |
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## Group Policy settings for scheduling scans after protection updates
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