I can confirm this is s tricky one (i had autorun blocked for all drives), this autorun file promps mcshield where it gives a message "drive is infected" then later comes back as clean, tried fileassassin no luck, tried lockhunter no luck, tried manually deleting it asked for 2 admin privs and still no luck, it then proceceed to hide all my folders on that drive, i had to format it to get rid of it and nothing pics it up not even bitdefender signatures
thank god for formating, i swear i will never put in my stuff into a family pc (i only did it because i had to transfer some files to him , but all regular scans came back clean argh!!!!!)