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

Microsoft Defender AV must be configured to check in real time with MAPS before content is run or accessed.

DISA Rule

SV-213433r1192798_rule

Vulnerability Number

V-213433

Group Title

SRG-APP-000278

Rule Version

WNDF-AV-000009

Severity

CAT II

CCI(s)

• CCI-002624 - Configure malicious code protection mechanisms to perform real-time scans of files from external sources at endpoint; and/or network entry and exit points as the files are downloaded, opened, or executed in accordance with organizational policy.

Weight

10

Fix Recommendation

This is applicable to unclassified systems. For other systems this is NA.

Set the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> Microsoft Defender Antivirus >> MAPS >> "Configure the 'Block at First Sight' feature" to "Enabled".

Check Contents

This is applicable to unclassified systems. For other systems this is NA.

Verify the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> Microsoft Defender Antivirus >> MAPS >> "Configure the 'Block at First Sight' feature" is set to "Enabled".

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

Criteria: If the value "DisableBlockAtFirstSeen" is REG_DWORD = 0, this is not a finding.

Vulnerability Number

V-213433

Documentable

False

Rule Version

WNDF-AV-000009

Severity Override Guidance

This is applicable to unclassified systems. For other systems this is NA.

Verify the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> Microsoft Defender Antivirus >> MAPS >> "Configure the 'Block at First Sight' feature" is set to "Enabled".

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

Criteria: If the value "DisableBlockAtFirstSeen" is REG_DWORD = 0, this is not a finding.

Check Content Reference

M

Target Key

3985