Step 3: Remove the malware from the affected devices For more information, see How to Pause and Resume sync in OneDrive. Pausing OneDrive sync will help protect your cloud data from being updated by potentially infected devices. To disable other types of access to a mailbox, see:Įnable or Disable POP3 or IMAP4 access for a user To disable Exchange ActiveSync for a mailbox, see How to disable Exchange ActiveSync for users in Exchange Online. Exchange ActiveSync synchronizes data between devices and Exchange Online mailboxes. If you suspect email as a target of the ransomware encryption, temporarily disable user access to mailboxes.
The key point here is to stop the spread of data encryption by the ransomware. Step 2: Disable Exchange ActiveSync and OneDrive sync If you don't have backups, or if your backups were also affected by the ransomware, you can skip this step. If you have offline backups, you can probably restore the encrypted data after you've removed the ransomware payload (malware) from your environment and after you've verified that there's no unauthorized access in your Microsoft 365 environments. The longer you wait, the less likely it is that you can recover the affected data.
It's important for you respond quickly to the attack and its consequences. We also recommend that you report the ransomware attack to law enforcement, scam reporting websites, and Microsoft as described later in this article. If you already paid, but you recovered without using the attacker's solution, contact your bank to see if they can block the transaction. In fact, paying the ransom can make you a target for more ransomware. There's no guarantee that paying the ransom will return access to your files. Before you get started, consider the following items: The steps in this article will give you the best chance to recover data and stop the internal spread of infection. Ransomware is big business, and in today's threat landscape Microsoft 365 is an ever-increasing target for sophisticated attacks. Microsoft Defender for Office 365 plan 1 and plan 2Įven if you take every precaution to protect your organization, you can still fall victim to a ransomware attack.This new experience brings Defender for Endpoint, Defender for Office 365, Microsoft 365 Defender, and more into the Microsoft 365 security center. The improved Microsoft 365 Defender portal is now available.
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