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Ok, instead of going to bed I got curious and looked a bit further, and, well, the executable is just this: https://github.com/Fahrj/reverse-ssh. I might rebuild it so that it outputs the commands instead of running them and see what happens…
OP already said this, but they are correct, it's actually fairly trivial to find machines running minecraft servers if they are open to the internet, with tools like masscan you can iterate over thousands of IP addresses in minutes.