Earlier quoted context omitted.
About Symantec's technology, it is worth noting that antivirus scans are based on identifying malware in one place, then being able to recognize that malware everywhere. This does not particularly help you recognize malware that was custom made to only be installed in one location. Particularly not when the people who were making that malware themselves have access to your anti-virus scans prior to deployment and can…
But see, the thing is, that's not what it says on the box. http://us.norton.com/antivirus/ "It's okay to blink, because we never do – SONAR technology and live 24x7 Threat Monitoring watch over your PC for any suspicious behavior to quickly identify threats." "Protection from the future, available today – our exclusive reputation and behavior antivirus technology are so advanced that they can stop online threats that…
But remote command and control through a covert channel can be done in ways that do not look particularly suspicious. And a sophisticated attacker should be assumed to know what behaviors SONAR is looking for.