Summary As of early year 2000, SubSeven has become the most popular Trojan (as measured in scans for this trojan). Furthermore, Network ICE believes that this is the most dangerous Trojan, with several powerful "hacker" capabilities.
Details
The popularity of scans for this Trojan is due to the fact that one victim can be commanded to scan for other victims. This has lead to numerous scans for port 27374 on the net.