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

Microsoft Defender AV must block untrusted and unsigned processes that run from USB.

DISA Rule

SV-278649r1192810_rule

Vulnerability Number

V-278649

Group Title

SRG-APP-000210

Rule Version

WNDF-AV-000045

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 >> Microsoft Defender Exploit Guard >> Attack Surface Reduction >> Configure Attack Surface Reduction rules to "Enabled".

Under the policy option "Set the state for each ASR rule:", then click "Show".

Enter GUID "b2b3f03d-6a65-4f7b-a9c7-1c7ef74a9ba4" in the "Value Name" column.

Enter "1" in the "Value" column.

Check Contents

Verify the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> Microsoft Defender Antivirus >> Microsoft Defender Exploit Guard >> Attack Surface Reduction >> Configure Attack Surface Reduction rules is set to "Enabled".

Procedure: Use the Windows Registry Editor to navigate to the following key:
HKLM\Software\Policies\Microsoft\Windows Defender\Windows Defender Exploit Guard\ASR\Rules

Criteria: If the value "b2b3f03d-6a65-4f7b-a9c7-1c7ef74a9ba4" is REG_SZ = 1, this is not a finding.

If the value is other than 1, this is a finding.

Vulnerability Number

V-278649

Documentable

False

Rule Version

WNDF-AV-000045

Severity Override Guidance

Verify the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> Microsoft Defender Antivirus >> Microsoft Defender Exploit Guard >> Attack Surface Reduction >> Configure Attack Surface Reduction rules is set to "Enabled".

Procedure: Use the Windows Registry Editor to navigate to the following key:
HKLM\Software\Policies\Microsoft\Windows Defender\Windows Defender Exploit Guard\ASR\Rules

Criteria: If the value "b2b3f03d-6a65-4f7b-a9c7-1c7ef74a9ba4" is REG_SZ = 1, this is not a finding.

If the value is other than 1, this is a finding.

Check Content Reference

M

Target Key

3985