Bot joining Server and greeting. Any informations about this bot?

I've just started server, with opened port 25565. About 30 seconds after server has done loading this bot went in.
First time met bot that fast at local server without broadcasting IP anywhere.

I cant find any information about this bot. (Other questions about bots are suggesting that they are just scanning IP servers for griefing/curious). Should I care about that bot? - I know this bot has now my public IP address, bla bla bla just whitelisted players or closed ports, but this bot had to know that I've started server what triggered him to connect.

More info about server:
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