Microsoft Windows Defender Antivirus STIG: WNDF-AV-000026

Check: WNDF-AV-000026 (in versions v2 r2 through v1 r1)

Title

Windows Defender AV must be configured to perform a weekly scheduled scan. (Cat II impact)

Discussion

This policy setting allows you to specify the day of the week on which to perform a scheduled scan. The scan 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 (0x1) Sunday (0x2) Monday (0x3) Tuesday (0x4) Wednesday (0x5) Thursday (0x6) Friday (0x7) Saturday (0x8) Never (default) If you enable this setting a scheduled scan will run at the frequency specified. If you disable or do not configure this setting a scheduled scan will run at a default frequency.

Check Content

Verify the policy value for Computer Configuration -> Administrative Templates -> Windows Components -> Windows Defender Antivirus -> Scan -> "Specify the day of the week to run a scheduled scan" is set to "Enabled" and anything other than "Never" selected in the drop down box. Procedure: Use the Windows Registry Editor to navigate to the following key: HKLM\Software\Policies\Microsoft\Windows Defender\Scan Criteria: If the value "ScheduleDay" is REG_DWORD = 0x8, this is a finding. Values of 0x0 through 0x7 are acceptable and not a finding.

Fix Text

Set the policy value for Computer Configuration -> Administrative Templates -> Windows Components -> Windows Defender Antivirus -> Scan -> "Specify the day of the week to run a scheduled scan" to "Enabled " and select anything other than "Never" in the drop down box.

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CCIs

CCIs tied to check.
Number Definition
CCI-001241

The organization configures malicious code protection mechanisms to perform periodic scans of the information system on an organization-defined frequency.

Controls

Controls tied to check. These are derived from the CCIs shown above.
Number Title
SI-3

Malicious Code Protection