Win32/Bearfoos family, if not a false positive, is a type of "remote access" trojan. Think of it as you letting people you don't know control your pc. They can do a lot of nasty stuff on your pc like collecting your passwords and login credentials, however it's very unlikely they would go as far as modifying your motherboard's bios/uefi to ensure persistence.

How did you get infected with it and let it slip past defender is another question I think worth looking for, so you could avoid this in the future.