Ensure 'Excel 2 macrosheets and add-in files' is set to 'Enabled: Open/Save blocked, use open policy'

AltaNivel 1Automatizadaoffice

Descripción

This policy setting determines whether users can open, view, edit, or save Excel files with Excel 2 macrosheets file format. Open/Save blocked, use open policy: Both opening and saving of the file type will be blocked. The file will open based on the policy setting configured in the "default file block behavior" key. The recommended state for this setting is: Enabled: Open/Save blocked, use open policy. Rationale: Using legacy file formats could allow malicious code to become active on a user's computer or the network. User setting: the audit checks HKEY_USERS\<SID>\SOFTWARE\Policies\Microsoft\office\16.0\excel\security\fileblock:xl2macros (REG_DWORD) in every loaded user hive (S-1-5-21-*) and is compliant when each holds 2. It prints 'no-user-hive-loaded' (FAIL) when no user profile is loaded, so scan while users are logged on.

Cómo se verifica

Método de auditoría: Registro de Windows

registry

$sids = @(Get-ChildItem -Path 'Registry::HKEY_USERS' -ErrorAction SilentlyContinue | Where-Object { $_.PSChildName -match '^S-1-5-21-\d+-\d+-\d+-\d+$' } | ForEach-Object { $_.PSChildName }); if ($sids.Count -eq 0) { 'no-user-hive-loaded' } else { $bad = @(); foreach ($s in $sids) { $v = (Get-ItemProperty -Path ('Registry::HKEY_USERS\' + $s + '\SOFTWARE\Policies\Microsoft\office\16.0\excel\security\fileblock') -Name 'xl2macros' -ErrorAction SilentlyContinue).'xl2macros'; if (-not ($null -ne $v -and @(2) -contains [int64]$v)) { $bad += $s + ':xl2macros=' + $v } }; if ($bad.Count -eq 0) { 'compliant' } else { 'non-compliant: ' + ($bad -join ', ') } }

Salida esperada: compliant

Cómo se corrige

Método de corrección: Guía o parche de infraestructura

Configure through Group Policy (User Configuration): User Configuration\Administrative Templates\Microsoft Excel 2016\Excel Options\Security\Trust Center\File Block Settings\Excel 2 Macrosheets and Add-in Files = Enabled: Open/Save blocked, use open policy

Propiedades

Sistemas operativos: Cualquiera
Etiquetas: officeproductivitycis-l1
Referencia: CIS Microsoft Office Enterprise Benchmark v2.0.0 - 2.2.4.7.2.2.3 Ensure 'Excel 2 macrosheets and add-in files' is set to 'Enabled: Open/Save blocked, use open policy'

Verificar este host

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

shell

tmaegis scan --target office