Data Protection Issues

How to Resolve OneDrive Malware Detection and Sync Blocking

WPS Content Manager Sep 30, 2026 869 views

Question details

Users need to resolve a synchronization block in OneDrive caused by files being identified as malicious by the system's malware protection.

How to Resolve OneDrive Malware Detection and Sync Blocking

Product: Microsoft OneDrive
Device & OS: not provided
Scenario: Attempting to sync or access files stored in OneDrive, but the process is halted due to a malware detection alert.
Observed behavior: OneDrive halts synchronization for specific files flagged as malicious, preventing users from opening or syncing the files normally until verification occurs.

Before you start

Ensure you have access to a web browser to log into OneDrive online and verify the origin of the flagged file to confirm it is genuinely safe before taking action.

Solution 1Recommended

Verify and Download via OneDrive for the Web

Use the web version of OneDrive to securely download the file after independently confirming that it is safe.

When OneDrive's desktop client blocks a file due to malware protection, you can often still manage it via the web interface. This should only be done if you are absolutely certain the file is safe and a false positive has occurred.

Sign in to OneDrive web

Open your web browser, navigate to the official OneDrive website, and sign in with your Microsoft credentials.

Locate the flagged file

Find the file that has been blocked from syncing. It will typically have a warning icon indicating it was flagged for malware.

Confirm file safety

Verify the source of the file. If necessary, scan it with a reliable local antivirus program to ensure it is not actually malicious.

Download the file

Once verified as safe, select the file and click the 'Download' button from the top menu to save it locally to your computer.

Verify and Download via OneDrive for the Web

Important Safety Warning: Do not bypass malware protection or force a download if you do not know the file's origin. Malicious files can compromise your device and data.

Solution 2

Contact Your Tenant Administrator for Review

If you are using a work or school account, request your IT administrator to review and unblock the file.

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Frequently Asked Questions

Why does OneDrive block certain files from syncing?

OneDrive includes built-in malware protection. If the system's scanning engines detect a signature matching known malicious software in a file, it will automatically halt synchronization to prevent the potential spread of malware across devices.

Can I manually bypass the malware protection in OneDrive?

Regular users cannot completely bypass the malware block in the sync client. You can manually download the file from the web version if you confirm it is safe, but fully unblocking a file within a business environment requires tenant administrator privileges.

What should I do if a legitimate work file is falsely flagged?

If a safe file is falsely flagged as malware, do not attempt to force a sync. Instead, contact your organization's IT administrator. They can investigate the false positive, securely review the file, and escalate the issue to Microsoft Support to have the block lifted.

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