Exploiting SMB flaw weeks before wannacry

Since the Shadow Brokers released the zero-day software vulnerabilities and hacking tools – allegedly belonged to the NSA's elite hacking team Equation Group – several hacking groups and individual hackers have started using them in their own way.
The April's data dump was believed to be the most damaging release by the Shadow Brokers till the date, as it publicly leaked lots of Windows hacking tools, including dangerous Windows SMB exploit.
After the outbreak of WannaCry last week, security researchers have identified multiple different campaigns exploiting Windows SMB vulnerability (CVE-2017-0143), called Eternalblue, which has already compromised hundreds of thousands of computers worldwide.