It's a pretty long and quite complicated story, so please bear with me.
Everything began 5 days ago, when I was browsing online, I realized that I had forgot the file I used to keep on my mediafile.cc account. So I searched it up. However, when trying to remember the correct URL for the website itself, I stumbled across a website with the url of mediacloud.cc instead. Nothing seemed to happen, so I got out immediately right after that.
Things were perfect, nothing out of the ordinary happened after that encounter with the website, but being so scared, I fresh installed Windows (just to be sure). After finishing fresh installing Windows, I downloaded Genshin Impact, because that and League of Legends is pretty much the only games I play currently. However, during the gameplay of both games, I noticed fps drops, which I've never seen before fresh installing the OS. I'm starting to think this is a UEFI/BIOS malware, and I've tried every single antivirus from ESET, Malwarebytes, Kaspersky, Bitdefender, HitmanPro, etc. With no results of any malware or rootkit that could be running. There is no unusual traffic either. There are a lot of possibilities I'm think of. One of those is a keylogger that can screenshot, and every time my fps drops, it's a screenshot from the keylogger. But it's strange, still, if a keylogger like that exists, wouldn't it have been detected by a ton of Antivirus software I've tried? Fresh installed Windows 3 times already, and the problem still persists. So yes, I'm starting to think this is a UEFI/BIOS malware.
I'm sorry if this story is too long, but it's the full story of whatever that is wrong with my PC. Hope to receive an answer soon!
Edit: I tried to find weird connection with netstat -b and I found something with rabbit1:61614 CommService.exe
After a while trying to figure what it is, I think it is from Emsisoft? Correct me if I'm wrong. Anyway, that rabbit1 thingy is not looking good at all, despite me not knowing anything about all this network traffic stuff. I have image, but it keeps saying server error while uploading this image, so...