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The user interface will appear different to a normal scan performed by Windows Defender.

The scan is performed outside of the usual Windows operating environment.

It will restart the endpoint when the scan is complete. The Microsoft Defender Offline scan takes about 15 minutes to run. Run a scanīefore you use Microsoft Defender Offline, make sure you save any files and shut down running programs. Microsoft Defender Offline notifications are configured in the same policy setting as other Microsoft Defender Antivirus notifications.įor more information about notifications in Windows Defender, see the Configure the notifications that appear on endpoints topic. Microsoft Defender Offline scans are indicated under Malware remediation status as Offline scan required. In Configuration Manager, you can identify the status of endpoints by navigating to Monitoring > Overview > Security > Endpoint Protection Status > System Center Endpoint Protection Status. The user will also be notified within the Windows Defender client. The prompt can occur via a notification, similar to the following: The need to perform an offline scan will also be revealed in Microsoft Intune if you're using it to manage your endpoints. Alternatively, if Windows Defender determines that Microsoft Defender Offline needs to run, it will prompt the user on the endpoint. In Windows 10, version 1607, you can manually force an offline scan. See the Manage Microsoft Defender Antivirus Security intelligence updates topic for more information. You can either force an update with Group Policy or however you normally deploy updates to endpoints, or you can manually download and install the latest protection updates from the Microsoft Malware Protection Center. Microsoft Defender Offline in Windows 10 and Windows 11 has the same hardware requirements as Windows 10.įor more information about Windows 10 and Windows 11 requirements, see the following topics:īefore running an offline scan, you should attempt to update Microsoft Defender Antivirus protection. In previous versions of Windows, a user had to install Microsoft Defender Offline to bootable media, restart the endpoint, and load the bootable media. In Windows 10 and Windows 11, Microsoft Defender Offline can be run with one click directly from the Windows Security app. You can use Microsoft Defender Offline if you suspect a malware infection, or you want to confirm a thorough clean of the endpoint after a malware outbreak. The scan runs from outside the normal Windows kernel so it can target malware that attempts to bypass the Windows shell, such as viruses and rootkits that infect or overwrite the master boot record (MBR). Microsoft Defender Offline is an antimalware scanning tool that lets you boot and run a scan from a trusted environment.