Not every malware threat makes the news
It isn't often that an outbreak like WannaCry hits the tech world, and when it does there's plenty of attention devoted to killing it.
High profile malware doesn't typically last that long because of the amount of attention it receives, but for every malware flavor that dies due to overexposure, countless slip by undetected.
You've probably heard of some, if not all, of the malware on this list. Most of it has been around for a while, staying alive through various incarnations thanks to the efforts of hackers. After all, why reinvent the wheel when you can just make tweak code that already works?