'Petya' cyber attack: What is this ransomware and is it more dangerous than WannaCry?

A virus is spreading rapidly across the world, shutting down some of the world's biggest companies with apparently no way of stopping it. It would be shocking if it didn't sound so much like the last crippling attack on the internet – Wannacry, which took down the NHS as well as a range of other huge companies just a couple of months ago. And the two appear to have come from the same family. That will come as an extra to worry to IT professionals – in part because the disastrous effects of Wannacry were supposed to have been patched and fixed, and in part because when the virus originally spread it was only stopped by a stroke of luck. The I.F.O. is fuelled by eight electric engines, which is able to push the flying object to an estimated top speed of about 120mph.