![]() Users might notice and report unusual activity in their Microsoft 365 mailboxes. Symptoms of a compromised Microsoft email account This article explains the symptoms of account compromise and how to regain control of the compromised account. Attackers using email to send data to external recipients is known as data exfiltration. Attackers often use the compromised mailbox to send email as the original user to recipients inside and outside of the organization. When someone other than the intended user steals those credentials, the associated account is considered to be compromised.Īfter an attacker steals the credentials and gains access to the account, they can access the associated Microsoft 365 mailbox, SharePoint folders, or files in the user's OneDrive. Learn about who can sign up and trial terms here.Īccess to Microsoft 365 mailboxes, data, and other services is controlled by credentials (for example a username and a password or PIN). 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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