"Wanna" ransomware outbreak. Please see this Sophos article sophos.com/kb/126733 for advice on how to protect your organization. Immediate action recommended.
Issue Thumbnails of encrypted files are still shown even if no profile is loaded or you don’t have the right key
First seen in/Applies to SafeGuard LAN Crypt Client for PC
Operating systems Windows Vista, Windows 7
As of Windows Vista, all thumbnails are stored in a central place. To prevent users from being able to see the thumbnails, you have to encrypt the thumbnails database files. Create two rules in your SafeGuard LAN Crypt Administration
As the files are in use by the Operating System, they will need to be deleted in order to encrypt them with SafeGuard LAN Crypt. The Disk Cleanup Tool can be used to purge the thumbnail cache:
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