SV-213451r1260219: Microsoft Defender AV must be configured to turn on email scanning. | Microsoft Defender Antivirus STIG SCAP Benchmark

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Assessment Title

Rule Text

Microsoft Defender AV must be configured to turn on email scanning.

Description

Discussion Text

This policy setting allows the configuration of email scanning. When email scanning is enabled, the engine will parse the mailbox and mail files according to their specific format in order to analyze the mail bodies and attachments. Several email formats are currently supported, for example: pst (Outlook), dbx mbx mime (Outlook Express), binhex (Mac). If this setting is enabled, email scanning will be enabled. If this setting is disabled or not configured, email scanning will be disabled.

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

IA Controls

NIST SP 800-53

Not mappedCCI-001170SV-89919V-75239

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:26
# Microsoft Defender AV must be configured to turn on email scanning.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# Group Policy - Configured properly
# 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('DisableEmailScanning').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Scan' -Name 'DisableEmailScanning' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'DisableEmailScanning') -eq 0))
}
# Intune - Configured properly or absent
# 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('AllowEmailScanning').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows Defender\Policy Manager' -Name 'AllowEmailScanning' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'AllowEmailScanning') -eq 1))
}
# Intune - Configured properly
# 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('AllowEmailScanning').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows Defender\Policy Manager' -Name 'AllowEmailScanning' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'AllowEmailScanning') -eq 1))
}
# Group Policy - Configured properly or absent
# 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('DisableEmailScanning').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Scan' -Name 'DisableEmailScanning' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'DisableEmailScanning') -eq 0))
}

if (((test_1 -and test_2) -or (test_3 -and test_4))) {
  Write-Output "PASS"
} else {
  Write-Output "FAIL"
}

Remediation

Set the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> Microsoft Defender Antivirus >> Scan >> "Turn on email scanning" to "Enabled".