EternalBlue is a well-known SMB exploit created by the NSA to attack various versions of Windows, including Windows 7. Etern-Blue-Windows-7-Checker will basically send SMB packets to a host to see if that Windows host machine is vulnerable to the EternalBlue exploit (CVE-2017-0143).
Based on https://github.com/REPTILEHAUS/Eternal-Blue/blob/master/checker.py