Top 10 New Malicious Code Families

Of the top 10 new malicious code families detected in the last six months of 2007, five were Trojans, two were worms, two were worms with a back door component and one was a worm with a virus component. The prevalence of Trojans in the top new malicious code families is indicative of multistage attacks. These are attacks in which an initial compromise takes place in order to install another piece of malicious code, such as a Trojan, that then downloads and installs additional threats.

Source: Symantec Internet Security Threat Report, Vol. XIII