Ensure automatic forwarding to external domains is blocked in outbound spam policies

YüksekDüzey 1Otomatikm365

Açıklama

Attackers who compromise a mailbox commonly add forwarding rules to exfiltrate mail. Prints the number of outbound spam filter policies whose AutoForwardingMode is not Off (expected 0). 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.

Nasıl denetlenir

Denetim yöntemi: Kabuk komutu

shell

$ErrorActionPreference = 'Stop'; if (-not (Get-Command Get-ConnectionInformation -ErrorAction SilentlyContinue) -or -not (Get-ConnectionInformation)) { throw 'Not connected: run Connect-ExchangeOnline first' }; $bad = @(Get-HostedOutboundSpamFilterPolicy -ErrorAction Stop | Where-Object { "$($_.AutoForwardingMode)" -ne 'Off' }); $bad.Count

Beklenen çıktı: 0

Nasıl düzeltilir

Düzeltme yöntemi: Kılavuz veya altyapı yaması

Set-HostedOutboundSpamFilterPolicy -Identity Default -AutoForwardingMode Off (and for each custom policy). Allow approved exceptions with a dedicated policy scoped to specific senders.

Özellikler

İşletim sistemleri: Herhangi biri
Etiketler: m365mail-flow
Referans: CIS Microsoft 365 Foundations Benchmark v7.0.0 - Exchange Online Protection / Outbound spam policy - automatic forwarding (verify section number for your release)

Bu ana makineyi denetle

Bunu denetleme izniniz olan bir makinede çalıştırın. Tarama salt okunurdur.

shell

tmaegis scan --target m365