STIGQter: STIG Summary: Microsoft Defender Antivirus Security Technical Implementation Guide Version: 2 Release: 9 Benchmark Date: 01 Jul 2026:

Microsoft Defender AV must enable extended cloud check.

DISA Rule

SV-278662r1192822_rule

Vulnerability Number

V-278662

Group Title

SRG-APP-000210

Rule Version

WNDF-AV-000058

Severity

CAT II

CCI(s)

• CCI-001170 - Prevents the automatic execution of mobile code in organization-defined software applications.

Weight

10

Fix Recommendation

Set the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> Microsoft Defender Antivirus >> MpEngine >> Configure extended cloud check to "Enabled" with a Policy Option value of "50".

Check Contents

Verify the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> Microsoft Defender Antivirus >> MpEngine >> Configure extended cloud check is set to "Enabled" with a Policy Option value of "50"; otherwise, this is a finding.

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

Criteria: If the value "MpBafsExtendedTimeout" is REG_DWORD = 50, this is not a finding.

If the value is other than 50, this is a finding.

Vulnerability Number

V-278662

Documentable

False

Rule Version

WNDF-AV-000058

Severity Override Guidance

Verify the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> Microsoft Defender Antivirus >> MpEngine >> Configure extended cloud check is set to "Enabled" with a Policy Option value of "50"; otherwise, this is a finding.

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

Criteria: If the value "MpBafsExtendedTimeout" is REG_DWORD = 50, this is not a finding.

If the value is other than 50, this is a finding.

Check Content Reference

M

Target Key

3985