WannaCry one of the most damaging cyberattack of 2017—continues effectively unabated, with at least 3,500 successful attacks per hour, globally, according to research published by security firm Armis on Wednesday. The research estimates that 145,000 devices worldwide continue to be infected, noting that "a single WannaCry infected device can be used by hackers to breach your entire network."
The primary reason WannaCry persists is an abundance of unpatched Windows versions across healthcare, manufacturing, and retail sectors - typically finding a "large number of older or unmanaged devices which are difficult to patch due to operational complexities," Ben Seri, research vice president at Armis, wrote in a blog post. The number of active Windows 7 (and older) installations across those sectors exceeds 60%, compared to less than 30% among technology companies, the research found.