That's a very crappy way of detecting malicious software. If you'd just rename the virus it would evade that virus scanner altogether. What a joke.
Virus scanners that scan your hard drive for viruses are pretty bad in the first place. You should have a virus scanner that blocks the download before you download it, that's way more efficient than trying to repair the damage after it is already done.
I can't believe you are running a full node and possibly a wallet on a computer without a proper virus scanner.
Oh, I'm not running a wallet on this computer, I don't have a proper offline setup yet, but that's the only place I'll be putting bitcoins. I just don't feel like paying for an anti-virus program that might not be any better than this one. It's not the greatest security, I acknowledge, but I'm not putting my bitcoins at risk on this computer.
Anyway, I don't think Avast is that bad a virus scanner really, but it's probably not perfect either.