See: https://forum.avast.com/index.php?topic=150758.0;topicseen

No WebShield, no detections or blocks. It’s like you’re bringing only one big gun to the party when you could have two, (or more) and you’re surrounded by vicious malware monsters who will kill you if you don’t kill them first. You won’t be able to see them if you’re not proactively armed with the appropriate weapon.

No, we’re not avast nerds and no, not insulted. Sooner or later, a web-based threat is going to get you w/o webshield in place. For example, downloading an EICAR test file(s) is web-based, just so you know.

Correct, it is your system.

Again, why only FSS in place? ???

[EDIT:] Warning: Don’t click any hXXp://killmalware.com/ links posted by Pondus as they have live Trojan links that will only be blocked by avast! only if WebShield is installed. You click those links, you will be infected. Just so you know.