The square evolved to the circle, and the floppy disk evolves to USB. There is a PoC of a "piece of malware" (discussion may start here about its real nature), capable of stealing information. Amazing, isn't it? The evolution comes on the way it works. The code is located in a USB device that runs at boot. It presumably can retrieve the information on the disk and send it via email to the attacker. After that, it can be completely cleaned from the system.
Talking about evolution, the "walkman" (which contained no malware) evolved to the iPod, which can contain malware from the very beginning.