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Windows Defender AV must be configured to block the Potentially Unwanted Application (PUA) feature.


Overview

Finding ID Version Rule ID IA Controls Severity
V-75147 WNDF-AV-000001 SV-89827r3_rule High
Description
After enabling this feature, PUA protection blocking takes effect on endpoint clients after the next signature update or computer restart. Signature updates take place daily under typical circumstances. PUA will be blocked and automatically quarantined.
STIG Date
MS Windows Defender Antivirus Security Technical Implementation Guide 2020-05-12

Details

Check Text ( C-74939r6_chk )
Verify the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> Windows Defender Antivirus >> "Configure detection for potentially unwanted applications" is set to "Enabled" and "Block".

Use the Windows Registry Editor to navigate to the following key:

HKLM\Software\Policies\Microsoft\Windows Defender

If the value "PUAProtection" does not exist, this is a finding.

If the value "PUAProtection" is REG_DWORD = 1, this is not a finding.
Fix Text (F-81759r4_fix)
Set the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> Windows Defender Antivirus >> "Configure Detection for Potentially Unwanted Applications" to "Enabled" and "Block".