New unknown users appearing on ubuntu, virus?

there are these two users periodically appearing in my ubuntu system (‘jicofo’,’jvb’) I have deleted them twice (in 19.10) but they reappeared again, so I thought I’d look into it and turns out they own a good amount of files, I am yet to check if there are any particularly interesting ones, in the meanwhile is that possible I got a malware somewhere in ubuntu 19.10? If so, would my upgrade to ubuntu 20.04 do something or nah?
What should my next course of action be? Backup and reinstall? If those users own those files, even if I delete all the ones they own I think I would backup them too wouldn’t I?
Thank you for taking the time to read this, hope someone can help me 🙂

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Author: Matteo Librizzi