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WNDF-AV-000021 - Microsoft Defender AV must be configured to always enable real-time protection.
Information
This policy setting turns off real-time protection prompts for known malware detection. Microsoft Defender Antivirus alerts when malware or potentially unwanted software attempts to install itself or to run on a user's computer. If this policy setting is enabled, Microsoft Defender Antivirus will not prompt users to take actions on malware detections. If this policy setting is disabled or not configured, Microsoft Defender Antivirus will prompt users to take actions on malware detections.Solution
Set the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> Microsoft Defender Antivirus >> Real-time Protection >> 'Turn off real-time protection' to 'Disabled' or 'Not Configured'.See Also
https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_MS_Defender_Antivirus_V2R10_STIG.zip
Item Details
Audit Name: DISA Microsoft Defender Antivirus STIG v2r10
Category: SYSTEM AND INFORMATION INTEGRITY
References: 800-53|SI-3c.1., CAT|II, CCI|CCI-002624, Rule-ID|SV-213445r1260208_rule, STIG-ID|WNDF-AV-000021, STIG-Legacy|SV-89907, STIG-Legacy|V-75227, Vuln-ID|V-213445
Plugin: Windows
Control ID: b53b024df4ba5e9b365b73dd69149ce34cc88400c1872ab1855a06d7010f6ee4