"Wanna" ransomware outbreak. Please see this Sophos article sophos.com/kb/126733 for advice on how to protect your organization. Immediate action recommended.
When disinfecting a Windows XP, Windows Vista, or Windows Me computer, Sophos Anti-Virus for Windows might report some infected files in System Restore. If this happens, purge System Restore. You should do this, regardless of what action Sophos Anti-Virus reports it has taken with those files.
The reason for this is
Two Microsoft Knowledge Base Articles describe why you should purge System Restore in this situation:
Purge System Restore on
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