Healthcare entities in the U.S. so far appear to have mostly avoided the crisis of WannaCry. The impact on healthcare entities so far appears to be relatively limited, a cyber threat group says. Microsoft quietly patched the flaw for currently supported Windows XP in March, before the flaw’s existence was revealed in April when the Shadow Brokers released a dump of “Equation Group” attack tools. The flaw exploits a flaw in Windows server message block functionality that was present in every Windows operating system from XP to Server 2008 R2.”]
Source: https://www.govinfosecurity.com/wannacry-whats-impact-on-us-healthcare-a-9921