SV-213450r1260216: Microsoft Defender AV must be configured to perform a weekly scheduled scan. | Microsoft Defender Antivirus STIG SCAP Benchmark

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Assessment Title

Rule Text

Microsoft Defender AV must be configured to perform a weekly scheduled scan.

Description

Discussion Text

This policy setting allows specifying 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 this setting is enabled, a scheduled scan will run at the frequency specified. If this setting is disabled or not configured, a scheduled scan will run at a default frequency.

How this relates to the STIG checklist: STIG vs SCAP benchmark.

IA Controls

NIST SP 800-53

Not mappedCCI-001241SV-89917V-75237

References

DPMS Target Microsoft Defender Antivirus DISA DPMS Target Microsoft Defender Antivirus 3985

SCC Automation Reference

The reconstructed evaluation script behind this rule's OVAL check(s) — every module a compound check combines, with this rule's own concrete values and DISA's SCC tool's real per-module mechanism curated from static teardown of SCC releases.

# Windows PowerShell
# Reconstructed from oval:mil.disa.stig.defenderantivirus:def:25
# Microsoft Defender AV must be configured to perform a weekly scheduled scan.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# registry_object (registry_test)
function test_1 {
  return ((((@{String='reg_sz';ExpandString='reg_expand_sz';Binary='reg_binary';DWord='reg_dword';MultiString='reg_multi_sz';QWord='reg_qword';None='reg_none'}[(Get-Item -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows Defender\Scan').GetValueKind('ScheduleDay').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows Defender\Scan' -Name 'ScheduleDay' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'ScheduleDay') -le 7)) -or (((@{String='reg_sz';ExpandString='reg_expand_sz';Binary='reg_binary';DWord='reg_dword';MultiString='reg_multi_sz';QWord='reg_qword';None='reg_none'}[(Get-Item -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows Defender\Policy Manager').GetValueKind('ScheduleScanDay').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows Defender\Policy Manager' -Name 'ScheduleScanDay' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'ScheduleScanDay') -le 7)))
}

if (test_1) {
  Write-Output "PASS"
} else {
  Write-Output "FAIL"
}

Assessment Script Powered by AISyntax-verified

A standalone PowerShell script to assess this control automatically. Review before running it in your environment.

Syntax-checked as valid PowerShell. Not executed here — running it for real needs the actual ms_defender_antivirus target this check assesses.

# OVAL Definition: oval:mil.disa.stig.defenderantivirus:def:25
if (!(Test-Path -Path "HKLM:\Software\Policies\Microsoft\Windows Defender\Scan\ScheduleDay" -ErrorAction SilentlyContinue) -or (Get-ItemProperty -Path "HKLM:\Software\Policies\Microsoft\Windows Defender\Scan\ScheduleDay" -ErrorAction SilentlyContinue).value -ge 7) {exit 1} else {exit 0}

Remediation

Set the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> Microsoft 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.