Ensure the common attachment types filter is enabled in the default anti-malware policy

MediaNivel 1Automatizadam365

Descripción

The common attachment filter blocks executable and script attachment types that are frequently used to deliver malware. Requires an already-connected Exchange Online session: Install-Module ExchangeOnlineManagement; Connect-ExchangeOnline (View-Only Organization Management is sufficient). The audit throws if no session exists.

Cómo se verifica

Método de auditoría: Comando de shell

shell

$ErrorActionPreference = 'Stop'; if (-not (Get-Command Get-ConnectionInformation -ErrorAction SilentlyContinue) -or -not (Get-ConnectionInformation)) { throw 'Not connected: run Connect-ExchangeOnline first' }; $p = Get-MalwareFilterPolicy -Identity Default -ErrorAction Stop; if ($p.EnableFileFilter -eq $true) { 'compliant' } else { 'noncompliant' }

Salida esperada: compliant

Cómo se corrige

Método de corrección: Guía o parche de infraestructura

Set-MalwareFilterPolicy -Identity Default -EnableFileFilter $true

Propiedades

Sistemas operativos: Cualquiera
Etiquetas: m365malware
Referencia: CIS Microsoft 365 Foundations Benchmark v7.0.0 - Exchange Online Protection / Anti-malware - common attachments filter (verify section number for your release)

Verificar este host

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

shell

tmaegis scan --target m365