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Submitted URL: http://docs.microsoft.com/en-us/microsoft-365/security/office-365-security/virus-detection-in-spo?view=o365-worldwide
Effective URL: https://learn.microsoft.com/en-us/defender-office-365/anti-malware-protection-for-spo-odfb-teams-about?view=o365-worldwide
Submission: On July 25 via api from DE — Scanned from DE
Effective URL: https://learn.microsoft.com/en-us/defender-office-365/anti-malware-protection-for-spo-odfb-teams-about?view=o365-worldwide
Submission: On July 25 via api from DE — Scanned from DE
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</form>Text Content
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BUILT-IN VIRUS PROTECTION IN SHAREPOINT ONLINE, ONEDRIVE, AND MICROSOFT TEAMS
* Article
* 06/24/2024
* 5 contributors
* Applies to: ✅ Exchange Online Protection, ✅ Microsoft Defender for Office 365
Plan 1 and Plan 2
Feedback
IN THIS ARTICLE
1. What happens if an infected file is uploaded to SharePoint Online?
2. What happens when a user tries to download an infected file by using the
browser?
3. Can admins bypass DisallowInfectedFileDownload and extract infected files?
4. What happens when the OneDrive sync client tries to sync an infected file?
5. Extended capabilities with Microsoft Defender for Office 365
6. Related articles
Show 2 more
Tip
Did you know you can try the features in Microsoft Defender XDR for Office 365
Plan 2 for free? Use the 90-day Defender for Office 365 trial at the Microsoft
Defender portal trials hub. Learn about who can sign up and trial terms here.
Microsoft 365 uses a common virus detection engine for scanning files that users
upload to SharePoint Online, OneDrive, and Microsoft Teams. This protection is
included with all subscriptions that include SharePoint Online, OneDrive, and
Microsoft Teams.
Important
The built-in anti-virus capabilities are a way to help contain viruses. They
aren't intended as a single point of defense against malware for your
environment. We encourage all customers to investigate and implement
anti-malware protection at various layers and apply best practices for securing
their enterprise infrastructure.
WHAT HAPPENS IF AN INFECTED FILE IS UPLOADED TO SHAREPOINT ONLINE?
The Microsoft 365 virus detection engine scans files asynchronously (at some
time after upload). If a user tries to download a file in a web browser or from
Teams that hasn't been scanned, a scan is triggered before the download is
allowed. All file types are not automatically scanned. Heuristics determine the
files to scan. When a file is found to contain a virus, the file is flagged.
Here's what happens:
1. A user uploads a file to SharePoint Online.
2. SharePoint Online, as part of its virus scanning processes, later determines
if the file meets the criteria for a scan.
3. If the file meets the criteria for a scan, the virus detection engine scans
the file.
4. If a virus is found within the scanned file, the virus engine sets a
property on the file that indicates the file is infected.
WHAT HAPPENS WHEN A USER TRIES TO DOWNLOAD AN INFECTED FILE BY USING THE
BROWSER?
By default, users can download infected files from SharePoint Online. Here's
what happens:
1. In a web browser, a user tries to download a file from SharePoint Online
that happens to be infected.
2. The user is shown a warning that a virus was detected in the file. The user
is given the option to proceed with the download and attempt to clean it
using anti-virus software on their device.
To change this behavior so users can't download infected files, even from the
anti-virus warning window, admins can use the DisallowInfectedFileDownload
parameter on the Set-SPOTenant cmdlet in SharePoint Online PowerShell. The value
$true for the DisallowInfectedFileDownload parameter completely blocks access to
detected/blocked files for users.
For instructions, see Use SharePoint Online PowerShell to prevent users from
downloading malicious files.
CAN ADMINS BYPASS DISALLOWINFECTEDFILEDOWNLOAD AND EXTRACT INFECTED FILES?
SharePoint admins and global admins* are allowed to do forensic file extractions
of malware-infected files in SharePoint Online PowerShell with the
Get-SPOMalwareFileContent cmdlet. Admins don't need access to the site that
hosts the infected content. As long as the file is marked as malware, admins can
use Get-SPOMalwareFileContent to extract the file.
For more information about the infected file, admins can use the
Get-SPOMalwareFile cmdlet to see the type of malware that was detected and the
status of the infection.
Important
* Microsoft recommends that you use roles with the fewest permissions. Using
lower permissioned accounts helps improve security for your organization. Global
Administrator is a highly privileged role that should be limited to emergency
scenarios when you can't use an existing role.
WHAT HAPPENS WHEN THE ONEDRIVE SYNC CLIENT TRIES TO SYNC AN INFECTED FILE?
When a malicious file is uploaded to OneDrive, the file is synced to the local
machine before being marked as malware. After the file is marked as malware, the
user can't open the synced file from their local machine.
EXTENDED CAPABILITIES WITH MICROSOFT DEFENDER FOR OFFICE 365
Microsoft 365 organizations that have Microsoft Defender for Office 365 included
in their subscription or purchased as an add-on can enable Safe Attachments for
SharePoint, OneDrive, and Microsoft Teams for enhanced reporting and protection.
For more information, see Safe Attachments for SharePoint, OneDrive, and
Microsoft Teams.
RELATED ARTICLES
Malware and ransomware protection in Microsoft 365
Turn on Safe Attachments for SharePoint, OneDrive, and Microsoft Teams.
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IN THIS ARTICLE
English (United States)
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* Previous Versions
* Blog
* Contribute
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