When securing a network most organizations are more concerned with controlling inbound traffic than outbound traffic. However, outbound traffic is a significant risk that is used by malware and targeted attackers as channels for Command and Control (C&C) as well as Data Exfiltration.
read more.....http://nigesecurityguy.wordpress.com/2014/04/03/apt-detection-indicators-part-3/
read more.....http://nigesecurityguy.wordpress.com/2014/04/03/apt-detection-indicators-part-3/