Slice, in all seriousness, is there a chance that your Clover development branch or something could have been compromised? If this isn't a false positive, it is a serious issue. Proton is a RAT trojan for macOS. And I'm sure you're all familiar with the time Transmission's (the BitTorrent Client) site was compromised and was used to deliver Ransomware to macOS users who downloaded a compromised version of the software. If not, then it's a false positive. And to be fair, VirusTotal only shows that one AV showing Clover as infected.
But as to Clover itself, I can assure that it is 100% malware free under usual circumstances. I've used it countless times before, and I'd even recommend that over Chameleon for BIOS-based computers.