Ensure 'Scan all downloaded files and attachments' is set to 'Enabled'

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This policy setting configures scanning for all downloaded files and attachments.

The recommended state for this setting is: Enabled.


When running an antivirus solution such as Microsoft Defender Antivirus, it is important to ensure that it is configured to heuristically monitor in real-time for suspicious and known malicious activity.


None - this is the default behavior.


To establish the recommended configuration via GP, set the following UI path to Enabled:

Computer Configuration\Policies\Administrative Templates\Windows Components\Microsoft Defender Antivirus\Real-Time Protection\Scan all downloaded files and attachments

Note: This Group Policy path may not exist by default. It is provided by the Group Policy template WindowsDefender.admx/adml that is included with the Microsoft Windows 8.1 & Server 2012 R2 Administrative Templates (or newer).

Default Value:

Enabled. (All downloaded files and attachments will be scanned.)