Detections
Analytics
18.10.43.4 (L1) Ensure 'Allow files to download and save to the host operating system from Microsoft Defender Application Guard' is set to 'Disabled'
Information
This policy setting determines whether to save downloaded files to the host operating system from the Microsoft Defender Application Guard container.The recommended state for this setting is: Disabled
Note: Microsoft Defender Application Guard requires a 64-bit version of Windows and a CPU supporting hardware-assisted CPU virtualization (Intel VT-x or AMD-V). This feature is not officially supported on virtual hardware, although it can work on VMs (especially for testing) provided that the hardware-assisted CPU virtualization feature is exposed by the host to the guest VM.
More information on system requirements for this feature can be found at
System requirements for Microsoft Defender Application Guard (Windows 10) | Microsoft Docs
Note #2: Credential Guard and Device Guard are not currently supported when using Azure IaaS VMs.
The primary purpose of Microsoft Defender Application Guard is to present a 'sandboxed container'. Potentially malicious files should not be copied to the host OS from the sandboxed environment, which could put the host at risk.
Solution
To establish the recommended configuration via GP, set the following UI path to Disabled :Computer Configuration\Policies\Administrative Templates\Windows Components\Microsoft Defender Application Guard\Allow files to download and save to the host operating system from Microsoft Defender Application Guard
Note: This Group Policy path is provided by the Group Policy template AppHVSI.admx/adml that is included with the Microsoft Windows 10 Release 1803 Administrative Templates (or newer).
Note #2: In older Microsoft Windows Administrative Templates, this setting was initially named
Allow files to download and save to the host operating system from Windows Defender Application Guard
, but it was renamed to
Allow files to download and save to the host operating system from Microsoft Defender Application Guard
starting with the Windows 10 Release 2004 Administrative Templates.
Impact:
Note: This setting was moved from the Next Generation (NG) profile to the Level 1 (L1) profile for the Windows 11 Operating System only NG profile settings were isolated from the L1 profile due to potential hardware compatibility issues. The Windows 11 Operating System is dependent on the same hardware as the NG settings, so hardware compatibility is no longer an issue.
None - this is the default behavior.
See Also
Item Details
Category: CONFIGURATION MANAGEMENT
References: 800-53|CM-6, 800-53|CM-7, CSCv7|8.3
Plugin: Windows
Control ID: 82f8e28a7ea9be1f8e24eb23d5cd719919aa1f6b90206ec130dc2ea7707c438f