The ransomware virus is now out in version 2. This time there is no kill switch so any one who has not learned a lesson from before will get caught out.
Wonder if the NHS has unplugged their computers from the internet. Not sure why so many people want to be connected. Savest network is no connection to the outside world.
The program I would be worried about is Have. They boast it's running on 3 billion devices. When you see what they did on the last release it was sitting a security issue, what wasn't that issue fixed on the previous 700 attempts. The writers of Java could take over the world as power stations probably use it too. Although there is no need for anyone to use it. Just quick to get functional code to market on multiple devices.
A variant has been discovered in the wild.
The propagation could well be slower as the Microsoft patch has been retrospectively fitted to many organizations since the first version and also anti-virus signatures now pick it up.