A few hints that your USB drive or any storage is infected:

• existence of autorun.inf
• unknown executable files that matches some of your Windows folders (documents.exe etc)
• randomly ASCII named executable files or files that can’t be deleted (runauto..)

Some of these files do not even show up when you view the listing on a PC, but shows up as a normal file on a Mac. It doesn’t do anything on the Mac, of course, as it’s a Windows executable file. Just delete the files and delete the virus

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