I noticed one post at The register on internal threats from Zombie bots.
Most of these “internal attackers” are likely unsuspecting victims themselves, unwitting hosts to malware infections that turn their Windows PCs into zombie drones under the control of hackers. An infected subscriber often reports performance degradations and other problems to the help desk, oblivious to the real reason why their computer seems sluggish or is behaving strangely. All the while his (it’s nearly always blokes who get their machine infected by viruses) machine is searching for other vulnerable hosts.
At China, more and more enterprise IT managers have recognized the importance of internal threats protection and been investing on internal audit and controls. No doubt, protection the border itself, generally speaking, refering to the internet connection point, is not enough to most of large enterprise networks, let alone telecom operation networks.