Some 75 percent of all new malware that appeared in the third quarter of 2007 were Trojans, according to data from the PandaLabs Q3 2007 report, available at: http://pandalabs.pandasecurity.com/archive/Pandalabs-Quarterly-Report-July_2D00_September-2007.aspx
Adware (12%) and worms (11%) were the other categories of malicious code with a significant number of new strains over the last three months.
In terms of the number of infections, Trojans also headed the list. During the third quarter they accounted for 32 percent of malware detected on computers of users of the Panda ActiveScan online scanner. Adware was in second place with an infection ratio of 24 percent.
The PandaLabs report on malware activity in the third quarter of 2007 also offers a comparative review of kits for installing malware using exploits. These malicious tools allow cyber-crooks to exploit vulnerabilities on computers and servers to infect users.
The report also looks at the most serious vulnerabilities in Q3 as well as other news related to criminal activity on the Web.