The presence of inbox rules that weren't created by the intended user or the administrator. Other users might receive emails from the compromised account without the corresponding email existing in the Sent Items folder of the sender. Suspicious activity, such as missing or deleted emails. Users might notice and report unusual activity in their Microsoft 365 mailboxes. Symptoms of a Compromised Microsoft Email Account When the attacker emails data to external recipients, this is called data exfiltration. One action commonly seen is the attacker sending emails as the original user to recipients both inside and outside of the organization. Using the stolen credentials, the attacker can access the user's Microsoft 365 mailbox, SharePoint folders, or files in the user's OneDrive. With them the attacker can sign in as the original user and perform illicit actions. When someone other than the intended user steals those credentials, the stolen credentials are considered to be compromised. 
What is a Compromised Email Account in Microsoft 365?Īccess to Microsoft 365 mailboxes, data and other services, is controlled by using credentials, for example a user name and password or PIN.
Summary Learn how to recognize and respond to a compromised email account in Microsoft 365. Microsoft Defender for Office 365 plan 1 and plan 2.Learn about who can sign up and trial terms here. Did you know you can try the features in Microsoft 365 Defender for Office 365 Plan 2 for free? Use the 90-day Defender for Office 365 trial at the Microsoft 365 Defender portal trials hub.
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