WannaCry is the end result of a successful attack malware that has executed on the targeted machine. Like all ransomware, it is the result of successful attack. The next EternalBlue will probably exploit a vulnerability that isn’t yet publicly known, or for which organizations have not had time to deploy a patch. The bad news is that it is not the first, nor will it be the last private party to exploit EternalBlue. The attack is a straightforward method of delivering an attack that is straightforward by leveraging high-volume software.”]
Source: https://www.darkreading.com/cloud/hypervisors-now-a-tool-to-protect-against-security-blind-spots