There is a sneaky virus called ONTHERIGHTSTUF.BIZ that will change the icon of the folder it's in that will say TDS and will change the thumbnail on some of the files in that folder in Linux. If you search for ONTHERIGHTSTUF.BIZ it will try to install an extension in your browser. Make sure you decline to install any extension that pops up when you search for ONTHERIGHTSTUF.BIZ to see what it is. ClamTK couldn't detect it but I searched for it manually and I deleted the infected file to get rid of it. This happened running MX Linux so who knows what will happen with other operating systems if you get infected with that virus.