Avast has started popping up with the message that it has blocked an infection (full message below). This address resolves to:
ec2-54-149-18-16.us-west-2.compute.amazonaws.com. It will usually pop up within a few minutes (usually seconds) of loading Firefox. After I close the Avast window, it can happen a few (15-30?) minutes later. No exact pattern I've seen.
I've run a full Avast Scan and installed and ran a Malwarebytes scan with no finds. I've run ccleaner to clean things up. I've checked my msconfig to make sure nothing is running that I don't recognize. I've looked at my firefox addons and extensions but nothing unusual.
Netbeans is the only new software I've installed before this started (downloaded directly from them).
I'm a bit stumped. If you have any ideas, I'd appreciate it.
Full Avast Message:
UPDATE: Forgot to mention that I'm on Windows 7 64 bit.
Edited by mseifert, 20 February 2015 - 01:05 AM.