Petya ransomware attack: What it is, and why this is happening again

Just six weeks on from WannaCry, the world has fallen victim to another fast-spreading ransomware in the form of Petya/GoldenEye. Why haven't lessons been learned?

http://www.zdnet.com/article/petya-ransomware-attack-what-it-is-and-why-this-is-happening-again/?loc=newsletter_large_thumb_related&ftag=TRE5575fdc&bhid=25151283725937532891160407260705