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Have you tried using this? https://mods.mybb.com/view/registrat...urity-question

Or these?

- Javascript bot protection
- Stop Forum Spam

You can try device fingerpriting tools.
Those are designed to control traffic and make sure bots don't mess up the whole picture.
The most affordable I've encountered is www.fraudhunt.net - starting at $25.
The likes of Forensiq, Distill or SiftScience are mostly catering to large-scale enterprises (at least according to their pricing strategies) and are quite expensive. Some provide credit card and financial fraud security as an extra option.

Or just filter everything in GA. Here's how to do it
https://moz.com/blog/how-to-stop-spa...-referral-data