This would seem to be just a variant of a common-variety kiddie-script. Everyone that has an ssh server on the net will be seeing attempts to login. Usually there is a whole lot of common user names being attempted. This could be a new botnet being tested out if the source IPs are genuine (not-being spoofed). Provided you are either using non-guessable passwords (or what you should be using is using SSH keys rather than passwords) then there is not much to worry about.
Regards, Martin
MartinVisser99@xxxxxxxxx