![]() If malicious, you have stopped email auto-forwarding for the affected mailboxes. You have identified the alerts associated with auto-forwarded emails as malicious (TP) or benign (FP) activities. You can then take recommended actions for the TP alerts to remediate the attack.įor an overview of alert grading for Microsoft Defender for Office 365 and Microsoft Defender for Cloud Apps, see the introduction article. This playbook helps you investigate Suspicious Email Forwarding Activity alerts and quickly grade them as either a True Positive (TP) or a False Positive (FP). In Microsoft 365, an alert is raised when a user auto-forwards an email to a potentially malicious email address. While manual forwarding requires direct action from users, they might not be aware of all the auto-forwarded emails. Automatic forwarding can be implemented in multiple ways like Inbox Rules, Exchange Transport Rule (ETR), and SMTP Forwarding. This is a very common tactic that attackers use when user accounts are compromised.Įmails can be forwarded either manually or automatically using forwarding rules. The targeted user might be unaware that their emails are being forwarded. Threat actors can use compromised user accounts for several malicious purposes, including reading emails in a user's inbox, forwarding emails to external recipients, and sending phishing mails, among others. Want to experience Microsoft 365 Defender? Learn more about how you can evaluate and pilot Microsoft 365 Defender.
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