Hello;
by mistake, I executed a shortcut to a folder on my USB key which ultimately is a virus. it executes a script in a folder $RECYCLEBIN/skype.rar … and avast does not detect this virus that infects every drive.
I compressed files here https://drive.google.com/open?id=0B2cSkTlhdMSiU3hJZEkxaXZTR2s