The psychology behind indexofbitcoinwalletdat upd is simple:
This is not a program; it is a feature of older web servers (Apache, Nginx, etc.). When a webmaster forgets to upload an index.html file, the server defaults to displaying a directory listing. This is called "Directory Indexing." A Google search for intitle:index.of reveals these exposed folders. These are essentially unlocked filing cabinets sitting on the public web.
file (especially if it is unencrypted) can potentially steal the cryptocurrency stored within that wallet. How to Protect Your Data