Microsoft Defender AV must be configured to block the Potentially Unwanted Application (PUA) feature. (Cat I impact)
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.
Verify the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> Microsoft 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.
Set the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> Microsoft Defender Antivirus >> "Configure Detection for Potentially Unwanted Applications" to "Enabled" and "Block".
Rule ID: SV-213426r823024_rule
Vulnerability ID: V-213426
Group Title: SRG-APP-000279
The organization configures malicious code protection mechanisms to perform organization-defined action(s) in response to malicious code detection.
Malicious Code Protection