SV-213449r1260214: Microsoft Defender AV must be configured to scan removable drives. | Microsoft Defender Antivirus STIG SCAP Benchmark

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Assessment Title

Rule Text

Microsoft Defender AV must be configured to scan removable drives.

Description

Discussion Text

This policy setting allows the management of whether or not to scan for malicious software and unwanted software in the contents of removable drives such as USB flash drives when running a full scan. If this setting is enabled, removable drives will be scanned during any type of scan. If this setting is disabled or not configured, removable drives will not be scanned during a full scan. Removable drives may still be scanned during quick scan and custom scan.

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

IA Controls

NIST SP 800-53

Not mappedCCI-000870SV-89915V-75235

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:24
# Microsoft Defender AV must be configured to scan removable drives.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# Group Policy: Computer Configuration\Administrative Templates\Windows Components\Microsoft Defender Antivirus\Scan\Scan removable drives is set to '0'
# 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('DisableRemovableDriveScanning').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows Defender\Scan' -Name 'DisableRemovableDriveScanning' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'DisableRemovableDriveScanning') -eq 0))
}
# Ensure the Intune Equivalent is not Contradicting
# registry_object (registry_test)
function test_2 {
  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\Policy Manager').GetValueKind('AllowFullScanRemovableDriveScanning').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows Defender\Policy Manager' -Name 'AllowFullScanRemovableDriveScanning' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'AllowFullScanRemovableDriveScanning') -eq 0))
}
# Intune: Computer Configuration\Administrative Templates\Windows Components\Microsoft Defender Antivirus\Scan\Scan removable drives is set to '1'
# registry_object (registry_test)
function test_3 {
  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\Policy Manager').GetValueKind('AllowFullScanRemovableDriveScanning').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows Defender\Policy Manager' -Name 'AllowFullScanRemovableDriveScanning' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'AllowFullScanRemovableDriveScanning') -eq 1))
}
# Ensure the Group Policy Equivalent is not Contradicting
# registry_object (registry_test)
function test_4 {
  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('DisableRemovableDriveScanning').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows Defender\Scan' -Name 'DisableRemovableDriveScanning' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'DisableRemovableDriveScanning') -eq 1))
}

if (((test_1 -and test_2) -or (test_3 -and test_4))) {
  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:mil.disa.stig.defenderantivirus:def:24
if (!(Get-ItemProperty -Path "HKLM:\Software\Policies\Microsoft\Windows Defender\Scan" -ErrorAction SilentlyContinue).DisableRemovableDriveScanning -eq 0 -or (Get-ItemProperty -Path "HKLM:\Software\Policies\Microsoft\Windows Defender\Policy Manager" -ErrorAction SilentlyContinue).AllowFullScanRemovableDriveScanning -eq 1) {exit 1} else {exit 0}

Remediation

Set the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> Windows Defender Antivirus >> Scan >> "Scan removable drives" to "Enabled".