ars technica: Eternal Blue, as the exploit is code-named, is one of scores of advanced NSA attacks that have been released over the past year by a mysterious group calling itself the Shadow Brokers. by Dan Goodin
'It was published in April in the group's most damaging release to date. Its ability to spread from computer to computer without any user action was the engine that allowed the WCry ransomware worm, which appropriated the leaked exploit, to shut down computers worldwide in May. Eternal Blue also played a role in the spread of NotPetya, a follow-on worm that caused major disruptions in June.
'Now, researchers at security firm FireEye say they're moderately confident the Russian hacking group known as Fancy Bear, APT 28, and other names has also used Eternal Blue, this time in a campaign that targeted people of interest as they connected to hotel Wi-Fi networks. In July, the campaign started using Eternal Blue to spread from computer to computer inside various staff and guest networks, company researchers Lindsay Smith and Ben Read wrote in a blog post. While the researchers didn't directly observe those attacks being used to infect guest computers connected to the network, they said a related campaign from last year used the control of hotel Wi-Fi services to obtain login credentials from guest devices.'