Ensure 'Specify threat alert levels at which default action should not be taken when detected' is set to 'Enabled'

MediaNivel 1Automatizadadefender

Descripción

This policy setting configures which automatic remediation action Microsoft Defender Antivirus will take for each threat alert level detection. The recommended state for this setting is: Enabled. Rationale: By default, Defender uses the action embedded in each threat’s malware signature (clean, quarantine, remove, etc.). Configuring this setting ensures the same action is always taken, regardless of how Microsoft classifies a specific threat. Audit reads the Group Policy registry value and prints 'compliant', 'unset' (policy not configured, reported as FAIL) or the non-compliant value. Registry value: HKLM\SOFTWARE\Policies\Microsoft\Windows Defender\Threats:Threats_ThreatSeverityDefaultAction (REG_DWORD); compliant when it is 1. Remediation writes 1 locally; in a domain set it through the ADMX so Group Policy does not revert it.

Cómo se verifica

Método de auditoría: Registro de Windows

registry

$v = (Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Threats' -Name 'Threats_ThreatSeverityDefaultAction' -ErrorAction SilentlyContinue).'Threats_ThreatSeverityDefaultAction'; if ($null -eq $v) { 'unset' } elseif (($null -ne $v -and @(1) -contains [int64]$v)) { 'compliant' } else { "non-compliant: $v" }

Salida esperada: compliant

Cómo se corrige

Método de corrección: Comando de shell

shell

$p = 'Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Threats'; if (-not (Test-Path -Path $p)) { New-Item -Path $p -Force | Out-Null }; New-ItemProperty -Path $p -Name 'Threats_ThreatSeverityDefaultAction' -Value 1 -PropertyType DWord -Force | Out-Null

Propiedades

Sistemas operativos: Cualquiera
Etiquetas: defenderantiviruscis-l1
Referencia: CIS Microsoft Defender Antivirus Benchmark v1.0.0 - 1.15.1 Ensure 'Specify threat alert levels at which default action should not be taken when detected' is set to 'Enabled'

Verificar este host

Ejecute esto en un equipo que tenga permiso para auditar. El escaneo es de solo lectura.

shell

tmaegis scan --target defender