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If ransomware is changing SharePoint files, stop the affected computer’s OneDrive sync or disconnect its mapped SharePoint drive immediately. Then preserve evidence, investigate both the cloud activity and the endpoint or account that made the changes, and restore files only after the threat and unauthorized access have been addressed. Restoring documents alone does not remove an attacker or disinfect a computer.
Contain the attack and preserve evidence
- Stop changes reaching SharePoint. On an affected computer, stop OneDrive sync or disconnect any mapped drive to the SharePoint library. Microsoft identifies sync and WebDAV as ways ransomware running locally can propagate file changes to SharePoint Online.
- Coordinate securely and preserve affected systems. Use communications the incident team considers safe. Preserve compromised systems for analysis rather than wiping or rebuilding them before responders can assess them. Consider disconnecting online backups until the attack is contained, and reset credentials known or suspected to be compromised.
- Build a timeline and identify the affected content. Record affected site collection URLs, libraries, users, endpoints and accounts, plus the last known time the files were clean. Note when suspicious changes began and whether they are continuing. Microsoft asks for affected site URLs and the last known clean modification time if support restoration is needed.
- Check whether access is still possible. Determine whether the incident appears limited to document changes or may involve compromised identities, administrator control or other Microsoft 365 services. If the event is active, widespread or involves identity or administrative control, involve qualified incident-response or compromise-recovery specialists.
Look for signs in the library
Microsoft lists several indicators of ransomware in a SharePoint library. Treat them as clues to investigate, not proof by themselves of the full scope or cause:
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- Many files have the same Modified By timestamp.
- Files fail to open or appear corrupted.
- Ransom instructions appear in directories.
- Files have been renamed or have an extension appended.
Reconstruct what happened
Review Microsoft 365 audit activity
Use Microsoft 365 audit records to examine relevant SharePoint and OneDrive file events, including modifications, renames, uploads, downloads, malware detections, recycle actions and restore events. Audit logging is on by default for Microsoft 365 organizations, according to Microsoft, but confirm that it is enabled for your tenant and check what records remain available under your retention settings.
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Correlate cloud events with the source
Compare file activity with endpoint, identity, network and security logs. The aim is to establish which device, account or process made the changes, whether the attacker accessed other content, and whether suspicious access is ongoing. A local ransomware infection can affect SharePoint through sync or WebDAV, so a cloud-only review may miss the source of the changes.
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Assess the wider incident
Microsoft Incident Response recommends assessing the incident scope and logs, identifying unavailable business applications, checking whether tested backups exist, and deciding whether compromise recovery is needed to remove attacker control. Investigate identity and administrative access as well as documents if the evidence suggests a broader tenant compromise.
Choose a recovery path that fits the damage
Start with the smallest restore scope that can return the affected content to a known-clean state. Microsoft’s documented options differ in what they restore and how far back they can reach:
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| Recovery option | Best fit | Documented reach or limitation |
|---|---|---|
| SharePoint version history | Damage limited to one or a few files when a clean earlier version is available. | Lets a user view and restore an earlier file version. The available versions depend on what the tenant retained. |
| Restore a document library (Files Restore) | Changes across a library that need to be rolled back together. | Microsoft says Files Restore can return a document library to a point within the previous 30 days. It uses file versions, so reduced version retention can limit recovery. |
| SharePoint recycle bin or site collection recycle bin | Files or other items that were deleted. | Microsoft documents 93 days of recycle-bin retention, counted from deletion in the original location. |
| Microsoft 365 Backup | Recovery of a SharePoint site or granular files and folders, if a suitable backup restore point exists. | Microsoft documents full-site and granular restores. Restore-point cadence differs by restore type and age; availability depends on what was configured and retained. |
| Microsoft Support | Content that cannot be restored from the site collection recycle bin. | Microsoft says to contact support within 14 days after content is removed from the site collection recycle bin. This is a request window, not a guarantee of recovery. |
Compare the options before restoring
- Clean-point age: Find the latest version or backup point known to predate malicious changes.
- Scope: Match the restore to the affected files, library or site rather than rolling back more content than necessary.
- Granularity and destination: Check whether you can select individual files or folders and whether the restore replaces content or can go to a new location.
- Retention and cadence: Confirm that the required versions or restore point still exist. A documented time window does not mean every tenant has every version or backup available.
- Security readiness: Do not return restored content to normal use while the endpoint, account or tenant remains compromised.
Restore safely and validate the result
- Contain the incident before restoring. Remove the ransomware payload from affected endpoints, reset compromised credentials and verify that unauthorized access to the Microsoft 365 tenant has been addressed. Microsoft’s ransomware guidance conditions restoration from offline backups on malware removal and verification that unauthorized tenant access has ended.
- Select and test the restore point. Choose a point from before the malicious changes. Where the recovery method permits, restore to a separate location first so responders can inspect the content before replacing live files.
- Validate files and business use. Check representative restored documents for integrity, verify that intended users can access the site, and test business-critical workflows that depend on the affected library.
- Monitor for renewed activity. Continue reviewing audit and security signals for suspicious changes or access after service is restored. If they recur, treat that as an unresolved incident rather than repeatedly restoring the same content.
When to escalate to Microsoft
If deleted content cannot be recovered from the site collection recycle bin, contact Microsoft Support within the 14-day window described in Microsoft’s SharePoint ransomware guidance. Provide the affected site collection URLs and the last known clean modification time. Recovery is not guaranteed, so preserve the timeline and continue incident response while the request is handled.
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