More on the latest 'Petya' Ransomware outbreak here
The following applies if you perform a scan in the 'Finder':
When you perform a ctrl/right-click scan, if the file you select is infected, then a desktop alert from the on-access scanner is displayed. The item will also be scanned by the on-demand scanner.
If you select a volume or folder to scan and it contains an infected file, this issue does not occur.
Applies to the following Sophos product(s) and version(s) Sophos Anti-Virus for Mac OS X
Do one of the following:
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