STIGQter: STIG Summary: Microsoft Windows Defender Antivirus Security Technical Implementation Guide Version: 2 Release: 2 Benchmark Date: 04 May 2021:

Windows Defender AV virus definition age must not exceed 7 days.

DISA Rule

SV-213453r569189_rule

Vulnerability Number

V-213453

Group Title

SRG-APP-000276

Rule Version

WNDF-AV-000029

Severity

CAT I

CCI(s)

• CCI-001240 - The organization updates malicious code protection mechanisms whenever new releases are available in accordance with organizational configuration management policy and procedures.

Weight

10

Fix Recommendation

Set the policy value for Computer Configuration -> Administrative Templates -> Windows Components -> Windows Defender Antivirus -> Signature Updates -> "Define the number of days before virus definitions are considered out of date" to "Enabled" and select "7" or less in the drop down box.

Do not select a value of 0.

This disables the option.

Check Contents

Verify the policy value for Computer Configuration -> Administrative Templates -> Windows Components -> Windows Defender Antivirus -> Signature Updates -> "Define the number of days before virus definitions are considered out of date" is set to "Enabled" and "7" or less selected in the drop down box (excluding "0", which is unacceptable).

If third-party antivirus protection is installed and up to date, the Windows Defender Antivirus age requirement is N/A.

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

Criteria: If the value "AVSignatureDue" is REG_DWORD = 7, this is not a finding.

A value of 1 - 6 is also acceptable and not a finding.

A value of 0 is a finding.

A value higher than 7 is a finding.

Vulnerability Number

V-213453

Documentable

False

Rule Version

WNDF-AV-000029

Severity Override Guidance

Verify the policy value for Computer Configuration -> Administrative Templates -> Windows Components -> Windows Defender Antivirus -> Signature Updates -> "Define the number of days before virus definitions are considered out of date" is set to "Enabled" and "7" or less selected in the drop down box (excluding "0", which is unacceptable).

If third-party antivirus protection is installed and up to date, the Windows Defender Antivirus age requirement is N/A.

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

Criteria: If the value "AVSignatureDue" is REG_DWORD = 7, this is not a finding.

A value of 1 - 6 is also acceptable and not a finding.

A value of 0 is a finding.

A value higher than 7 is a finding.

Check Content Reference

M

Target Key

3985

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