Ensure 'ASR: Block abuse of exploited vulnerable signed drivers' is set to 'Block'

MédiaNível 1Automatizadaintune-defender

Descrição

This rule prevents an application from writing a vulnerable signed driver to disk. The recommended state for this setting is: Block. Note: The Block abuse of exploited vulnerable signed drivers setting does not block a driver that already exists on the system from being loaded. Audit: reads the Intune PolicyManager ASR rules value (via the WinningProvider GUID) and requires the rule entry 56a863a9-875e-4185-98a7-b882c64b5ce5=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() }); $want = @('56a863a9-875e-4185-98a7-b882c64b5ce5=1'); if (@($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 abuse of exploited vulnerable signed drivers (Device)

Propriedades

Sistemas operacionais: Qualquer
Tags: intune-defenderintuneregistry
Referência: CIS Microsoft Intune for Microsoft Defender Antivirus Benchmark v1.0.0 - 2.10 Ensure 'ASR: Block abuse of exploited vulnerable signed drivers' 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