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V-278678

CAT II (Medium)

Microsoft Defender AV must enable asynchronous inspection.

Rule ID

SV-278678r1190771_rule

STIG

Microsoft Defender Antivirus Security Technical Implementation Guide

Version

V2R8

CCIs

CCI-001170

Discussion

Network protection includes performance optimization that allows block mode to asynchronously inspect long-lived connections, which might provide a performance improvement. This optimization can also help with app compatibility problems.

Check Content

Verify the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> Microsoft Defender Antivirus >> Network Inspection System >> Turn on asynchronous inspection is set to "Enabled"; otherwise, this is a finding.

Procedure: Use the Windows Registry Editor to navigate to the following key: 
HKLM\Software\Policies\Microsoft\Windows Defender\NIS

Criteria: If the value "AllowSwitchToAsyncInspection" is REG_DWORD = 1, this is not a finding.

If the value is 0, this is a finding.

Fix Text

Set the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> Microsoft Defender Antivirus >> Network Inspection System >> Turn on asynchronous inspection to "Enabled".