WanaCrypt0r 2.0 has been spreading like wildfire and causing severe impact to individuals and businesses alike.  Wcry not only is a crypto-ransomware variant, but packages a leaked NSA exploit with it (MS17-010), creating a self-propagating ransomware worm.

https://www.renditioninfosec.com/2017/05/wanacry-because-your-organization-is-slow-to-patch-stop-the-tears-with-tearst0pper/