Since I'm very much a novice in this department, I'm just hoping to have a few questions answered by the experts. If you need me to post logs, I will. But I doubt it. It's pretty straight forward.
Long story, short: I stopped by a chat site that I used to frequent. The kind that was popular 10-15 years ago. It still has the same old school layout, and I assume the same old school security, because I've seen it attacked few times. Rapid fire spam, unclosable (obscene) webcams, etc, etc. Well, when I logged in this time, Avast hit me with an alert almost immediately. A threat had been blocked. The object in question ended in "HACK3.php". The infection was listed as "JS:Agent-EAA [Trj]". I logged out a minute later, and ran scans with the programs that I had on hand -- Avast (Nothing), SuperAntiSpyware (Nothing serious), ShieldsUp (100% Passes all around). I even downloaded a couple of the more popular antiviruses, and didn't get anything from those either. As far as I could tell, the attack was blocked. It was still unacceptable though. If a site can't guarantee a safer experience than that, and people can't pretend to be humans, then it's not worth the time.
My questions..
Can anyone tell about that particular infection? What would be the goal behind a trojan like that?
Did I handle the attack correctly? Other than Avast, are there any other free programs that I should be running on a regular basis?
Is it possible that other infections got through and went undetected?
Thanks.