I have Norton Internet Security from Comcast, and I happened to see 3 outgoing connections in the Firewall with the signature "System Infected: Backdoor.Trojan Activity 2".
I immediately ran a System Scan in the Antivirus, but it found nothing.
What do I do? I am quite worried.
Edit (just found how): This is on a late 2013 iMac running Mavericks. I used Liveupdate right before the scan. I did not reboot first though, should I have?