SV-205692r958478: Windows Server 2019 Windows Defender SmartScreen must be enabled. | Microsoft Windows Server 2019 STIG SCAP Benchmark

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Assessment Title

Rule Text

Windows Server 2019 Windows Defender SmartScreen must be enabled.

Description

Discussion Text

Windows Defender SmartScreen helps protect systems from programs downloaded from the internet that may be malicious. Enabling SmartScreen can block potentially malicious programs or warn users.

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

IA Controls

NIST SP 800-53

Not mappedCCI-000381V-93411SV-103497

References

DPMS Target Microsoft Windows Server 2019 DISA DPMS Target Microsoft Windows Server 2019 2907

Checks

DISA STIG (Manual Reference)

This is applicable to unclassified systems; for other systems, this is NA.

If the following registry value does not exist or is not configured as specified, this is a finding:

Registry Hive: HKEY_LOCAL_MACHINE
Registry Path: \SOFTWARE\Policies\Microsoft\Windows\System\

Value Name: EnableSmartScreen

Value Type: REG_DWORD
Value: 0x00000001 (1)

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.windows2019:def:205692
# Windows Server 2019 Windows Defender SmartScreen must be enabled.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# Verifies 'Configure Windows SmartScreen' is set to 'Enabled'
# 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\System').GetValueKind('EnableSmartScreen').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\System' -Name 'EnableSmartScreen' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'EnableSmartScreen') -eq 1))
}

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_windows_server_2019 target this check assesses.

# OVAL Definition: oval:mil.disa.stig.windows2019:def:205692
if ((Get-ItemProperty -Path 'HKLM:\Software\Policies\Microsoft\Windows\System' -Name 'EnableSmartScreen' -ErrorAction SilentlyContinue).EnableSmartScreen -eq 1) {
    Write-Output "PASS"
    Exit 0
} else {
    Write-Output "FAIL"
    Exit 1
}

Remediation

Configure the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> File Explorer >> "Configure Windows Defender SmartScreen" to "Enabled" with either option "Warn" or "Warn and prevent bypass" selected.

Windows 2019 includes duplicate policies for this setting. It can also be configured under Computer Configuration >> Administrative Templates >> Windows Components >> Windows Defender SmartScreen >> Explorer.