Ransomware is known as NotPetya, Petrwap, or a variant of Petya. It is spreading in part through the exploitation of an NSA-built Windows-based SMB exploit known as Eternal Blues Eternal Blue was developed by the U.S. National Security Agency for the purpose of infecting the computers of those it wished to spy upon. As a consequence, the NSA didnt tell Microsoft about the vulnerability it had discovered in Windows *until* details were stolen from the agency by a mysterious group of hackers known as the Shadow Brokers.”]
Source: https://grahamcluley.com/global-ransomware-outbreak-happening-right-now/