If you find an USB in a wall or on ground DON'T TOUCH IT and destroy it or call police.
We are all wondering what's in USB and we want to use it but a situation that happened in Holland showing us we must keep to them away.
At an park in Holland someone found an usb. Usb which found it was opened and looked into what's in it by name of DSM Chemical Company and they were shocked.
It was filled up completely with trojan by some hackers.
If it's used in critical department of that company, hackers could be have many critical information about that company.
Or maybe it has a lot o money in crypto inside :D, who knows is like download a song from internet virus are everywhere.
just thinking but is really important to do not open anything inside this usb and always be carefull with all devices and files you didn't know.
I would most definitely search the USB Stick, if even just to find the owner, as there are often important things on them. A backup copy of all my wallets resides on a USB of mine.
What you wanna do to be as safe as you can, aside from using a good malware cleaner, is to ensure to open the stick within a Virtual Machine, like Sandboxy, Oracle VirtualBox, Etc.