Step 3: Make sure that the attacker can't resume access to your account If your on-premises identity is federated with Microsoft 365, you must change your password on-premises, and then you must notify your administrator of the compromise.Even though the password history requirement lets you reuse a more recent password, you should select something that the attacker can't guess. Don't reuse any of your last five passwords.Make sure that the password is strong and that it contains upper and lowercase letters, at least one number, and at least one special character. Step 2: Make sure that the attacker can't log on to your Microsoft 365 account You can download free anti-malware or antivirus software from Microsoft. If antivirus software isn't installed on your computer, we recommend that you install antivirus software and then run a scan to make sure that no malicious software is installed on the computer.Make sure that you have Windows Update turned on.Step 1: Make sure that your computer isn't compromised After you perform these steps, we recommend that you run a virus scan to make sure that your computer isn't compromised. These steps help you remove any back-door entries that the hijacker may have added to your account. To help resolve these issues, you must perform all the following steps within five minutes of regaining access to your account to make sure that the hijacker doesn't resume control your account. An unusual signature was recently added, such as a fake banking signature or a prescription drug signature.Įven after you've regained access to your account, the attacker may have added back-door entries that enable the attacker to resume control of the account.Unusual credential changes, such as multiple password changes are required.Unusual profile changes, such as the name, the telephone number, or the postal code were updated.The Sent or Deleted Items folders in Microsoft Outlook or in Microsoft Outlook Web App contain common hacked-account messages, such as 'I'm stuck in London, send money.'.

You may also experience one or more of the following issues: Or, you notice that suspicious activity occurs in your account, such as large amounts of spam that originates from your account. You may have issues when you try to sign in to Microsoft 365.

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