Try a previous version feature.
https://www.virus-entferner.de/2017/01/15/spora-ransomware-virus-entfernen/ The Windows OS provides a built-in option of recovering previous versions of files. It can also be applied to folders...
I had just the same problem with my usb pendrive. Try to remove it with: http://malwareprotectioncenter.com/2015/07/08/shortcut-virus/ . Avast and AVG will not help you. It is for sure.
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