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

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

DISA Rule

SV-213452r569189_rule

Vulnerability Number

V-213452

Group Title

SRG-APP-000276

Rule Version

WNDF-AV-000028

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 "Define the number of days before spyware definitions are considered out of date" to "Enabled" and select "7" or less in the drop down box.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 "Define the number of days before spyware definitions are considered out of date" is set to "Enabled" and "7"or less selected in the drop down box (excluding "0", which is unacceptable).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 anti-spyware is installed and up to date, the Windows Defender AV spyware age requirement will be 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 "ASSignatureDue" 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-213452

Documentable

False

Rule Version

WNDF-AV-000028

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 "Define the number of days before spyware definitions are considered out of date" is set to "Enabled" and "7"or less selected in the drop down box (excluding "0", which is unacceptable).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 anti-spyware is installed and up to date, the Windows Defender AV spyware age requirement will be 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 "ASSignatureDue" 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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