While the veteran Email-Worm.Win32.NetSky.q topped the Top 10 in December and accounted for 20 percent of email traffic, it was the appearance of trojans, including Trojan-Downloader.Win32.Diehard.dc (second place) and its variants, that was of significance. The .dc modification of this program is similar to the declining Warezov family of worms. It enables spam to be sent from infected computers and first appeared on December 21. During one period it accounted for more than 80 percent of all malicious email traffic.
展开▼
