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


Overview

Finding ID Version Rule ID IA Controls Severity
V-75243 WNDF-AV-000029 SV-89923r2_rule High
Description
This policy setting allows you to define the number of days that must pass before virus definitions are considered out of date. If definitions are determined to be out of date this state may trigger several additional actions including falling back to an alternative update source or displaying a warning icon in the user interface. By default this value is set to 14 days. If you enable this setting virus definitions will be considered out of date after the number of days specified have passed without an update. If you disable or do not configure this setting virus definitions will be considered out of date after the default number of days have passed without an update.
STIG Date
Windows Defender Antivirus Security Technical Implementation Guide 2017-12-27

Details

Check Text ( C-75035r4_chk )
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 "Define the number of days before virus definitions are considered out of date" is set to "Enabled" and "7" or less selected in the drop down box (excluding "0", which is unacceptable).

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.
Fix Text (F-81853r2_fix)
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 "Define the number of days before virus definitions are considered out of date" to "Enabled" and select "7" or less in the drop down box.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.