Ensure 'ASR: Block executable content from email client and webmail' is set to 'Block'

MédiaNível 1Automatizadaintune-defender

Descrição

This rule blocks email opened within the Microsoft Outlook application, or Outlook.com and other popular webmail providers from propagating the following file types: • Executable files (such as .exe, .dll, or .scr) • Script files (such as a PowerShell .ps1, Visual Basic .vbs, or JavaScript .js file) The recommended state for this setting is: Block. Audit: reads the Intune PolicyManager ASR rules value (via the WinningProvider GUID) and requires the rule entry be9ba2d9-53ea-4cdc-84e5-9b1eeee46550=1 (Block).

Como é verificado

Método de auditoria: Registro do Windows

registry

$p = (Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\PolicyManager\current\device\Defender' -Name 'AttackSurfaceReductionRules_WinningProvider' -ErrorAction SilentlyContinue).'AttackSurfaceReductionRules_WinningProvider'; if (-not $p) { 'non-compliant: no ASR WinningProvider' } else { $p = ([string]$p).Trim('{}'); $k = 'Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\PolicyManager\Providers\' + $p + '\default\Device\Defender'; if (-not (Test-Path $k)) { $k = 'Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\PolicyManager\Providers\{' + $p + '}\default\Device\Defender' }; $v = (Get-ItemProperty -Path $k -Name 'AttackSurfaceReductionRules' -ErrorAction SilentlyContinue).'AttackSurfaceReductionRules'; $have = @(([string]$v) -split '\|' | ForEach-Object { $_.Trim().ToLower() }); $want = @('be9ba2d9-53ea-4cdc-84e5-9b1eeee46550=1'); if (@($want | Where-Object { $have -contains $_ }).Count -gt 0) { 'compliant' } else { 'non-compliant: ' + $v } }

Saída esperada: compliant

Como é corrigido

Método de correção: Orientação ou patch de infraestrutura

To establish the recommended configuration via configuration profiles, set the following Settings Catalog path to Block. Defender\Block executable content from email client and webmail

Propriedades

Sistemas operacionais: Qualquer
Tags: intune-defenderintuneregistry
Referência: CIS Microsoft Intune for Microsoft Defender Antivirus Benchmark v1.0.0 - 2.14 Ensure 'ASR: Block executable content from email client and webmail' is set to 'Block'

Verificar este host

Execute isto em uma máquina que você tenha permissão para auditar. A varredura é somente leitura.

shell

tmaegis scan --target intune-defender