Ensure 'Specify the interval to check for security intelligence updates' is set to 'Enabled: 4' or fewer, but not '0'

MediaNivel 1Automatizadadefender

Descripción

This policy setting configures an interval at which to check for security intelligence updates. Security intelligence updates are the continuously updated packages that Microsoft Defender Antivirus uses to recognize, classify, and block the latest malware, spyware, unwanted software, and potentially harmful behaviors. The recommended state for this setting is: Enabled: 4 or fewer, but not 0. Rationale: A malware scan is only as effective as the threat definitions it uses. Running a scan with outdated intelligence significantly reduces detection accuracy and can create a false sense of security. 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\SignatureUpdates:SignatureUpdateInterval (REG_DWORD); compliant when it is 4 or 3 or 2 or 1. Remediation writes 4 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

$v = (Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\SignatureUpdates' -Name 'SignatureUpdateInterval' -ErrorAction SilentlyContinue).'SignatureUpdateInterval'; if ($null -eq $v) { 'unset' } elseif (($null -ne $v -and @(4,3,2,1) -contains [int64]$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\SignatureUpdates'; if (-not (Test-Path -Path $p)) { New-Item -Path $p -Force | Out-Null }; New-ItemProperty -Path $p -Name 'SignatureUpdateInterval' -Value 4 -PropertyType DWord -Force | Out-Null

Propiedades

Sistemas operativos: Cualquiera
Etiquetas: defenderantiviruscis-l1
Referencia: CIS Microsoft Defender Antivirus Benchmark v1.0.0 - 1.14.1 Ensure 'Specify the interval to check for security intelligence updates' is set to 'Enabled: 4' or fewer, but not '0'

Verificar este host

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

shell

tmaegis scan --target defender