Microsoft Windows Defender Antivirus STIG: WNDF-AV-000015

Check: WNDF-AV-000015 (in versions v2 r2 through v1 r1)

Title

Windows Defender AV must be configured to not allow override of scanning for downloaded files and attachments. (Cat II impact)

Discussion

This policy setting configures a local override for the configuration of scanning for all downloaded files and attachments. This setting can only be set by Group Policy. If you enable this setting the local preference setting will take priority over Group Policy. If you disable or do not configure this setting Group Policy will take priority over the local preference setting.

Check Content

Verify the policy value for Computer Configuration -> Administrative Templates -> Windows Components -> Windows Defender Antivirus -> Real-time Protection -> "Configure local setting override for scanning all downloaded files and attachments" is set to "Disabled" or "Not Configured". Procedure: Use the Windows Registry Editor to navigate to the following key: HKLM\Software\Policies\Microsoft\Windows Defender\Real-Time Protection Criteria: If the value "LocalSettingOverrideDisableIOAVProtection" is REG_DWORD = 0, this is not a finding. If the value does not exist, this is not a finding. If the value is 1, this is a finding.

Fix Text

Set the policy value for Computer Configuration -> Administrative Templates -> Windows Components -> Windows Defender Antivirus -> Real-time Protection -> "Configure local setting override for scanning all downloaded files and attachments" to "Disabled" or "Not Configured".

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CCIs

CCIs tied to check.
Number Definition
CCI-001169

The information system prevents the download of organization-defined unacceptable mobile code.

Controls

Controls tied to check. These are derived from the CCIs shown above.
Number Title
SC-18 (3)

Prevent Downloading / Execution