"Wanna" ransomware outbreak. Please see this Sophos article sophos.com/kb/126733 for advice on how to protect your organization. Immediate action recommended.
An on-demand or scheduled scan fails to scan a file.
On-access scanning is not affected.
First seen in Sophos for Microsoft SharePoint
This can occur when a file is uploaded by an ordinary (non-admin) user but has not yet been checked in. This means that the file is not visible to either an administrator or to the on-demand/scheduled scan. Once checked in, the file will be scanned in the usual way.
This is a SharePoint behaviour. Note the following:
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