Title

Microsoft Defender AV must be configured to check for definition updates daily. (Cat II impact)

Discussion

This policy setting allows specifying the day of the week on which to check for definition updates. The check can also be configured to run every day or to never run at all. This setting can be configured with the following ordinal number values: (0x0) Every Day (default) (0x1) Sunday (0x2) Monday (0x3) Tuesday (0x4) Wednesday (0x5) Thursday (0x6) Friday (0x7) Saturday (0x8) Never If this setting is enabled, the check for definition updates will occur at the frequency specified. If this setting is disabled or not configured, the check for definition updates will occur at a default frequency.

Check Content

Verify the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> Microsoft Defender Antivirus >> Security Intelligence Updates >> "Specify the day of the week to check for security intelligence updates" is set to "Enabled" and "Every Day" is selected in the drop-down box. Procedure: Use the Windows Registry Editor to navigate to the following key: HKLM\Software\Policies\Microsoft\Windows Defender\Signature Updates Criteria: If the value "ScheduleDay" is REG_DWORD = 0, this is not a finding.

Fix Text

Set the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> Microsoft Defender Antivirus >> Signature Updates >> "Specify the day of the week to check for definition updates" to "Enabled" and select "Every Day" in the drop-down box.

Additional Identifiers

Rule ID: SV-213454r823077_rule

Vulnerability ID: V-213454

Group Title: SRG-APP-000261

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.