SV-213446r1260210: Microsoft Defender AV must be configured to enable behavior monitoring. | Microsoft Defender Antivirus STIG SCAP Benchmark

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Assessment Title

Rule Text

Microsoft Defender AV must be configured to enable behavior monitoring.

Description

Discussion Text

This policy setting allows configuration of behavior monitoring. If this setting is enabled or not configured, behavior monitoring will be enabled. If this setting is disabled, behavior monitoring will be disabled.

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

IA Controls

NIST SP 800-53

Not mappedCCI-001170SV-89909V-75229

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:21
# Microsoft Defender AV must be configured to enable behavior monitoring.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# Behavior monitoring is enabled by Intune
# 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\Policy Manager').GetValueKind('AllowBehaviorMonitoring').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows Defender\Policy Manager' -Name 'AllowBehaviorMonitoring' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'AllowBehaviorMonitoring') -eq 1))
}
# Behavior monitoring is enabled by GPO
# 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\Real-Time Protection').GetValueKind('DisableBehaviorMonitoring').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows Defender\Real-Time Protection' -Name 'DisableBehaviorMonitoring' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'DisableBehaviorMonitoring') -eq 0))
}
# Behavior monitoring is not set by Intune
# registry_object (registry_test)
function test_3 {
  return (-not ($null -ne (Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows Defender\Policy Manager' -Name 'AllowBehaviorMonitoring')))
}

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

Remediation

Set the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> Windows Defender Antivirus >> Real-time Protection >> "Turn on behavior monitoring" to "Enabled " or "Not Configured".