A security audit of my small 6 person office found a Digital Ocean machine trying to brute force one of our Windows machines. I'm becoming less and less impressed with Digital Ocean as time goes on.
This is not the best solution (fail2ban and 2fa would be better) but https://github.com/skeeto/endlessh is a neat tool if you want to annoy someone with unsophisticated scripts. It’s worth noting that annoying a script kiddie might get you ddosed.