Trojans represented 83 percent of the new malware that emerged in the second quarter of 2007, and 26 percent of the infections detected by ActiveScan, Panda Software?s online scanner, in the same period. This makes Trojans the cornerstone of the current malware model.

In 2006, Trojans represented 22 percent of the infections detected by ActiveScan, compared to the 33 percent corresponding to adware. However, during the first half of 2007, this trend has changed. Trojans have replaced adware as the malicious codes that cause the most infections. In the second quarter, Trojans were the most frequently detected malware on users? computers.

Adware, which caused 24 percent of the infections detected by ActiveScan, was the second most damaging malware in the second quarter of 2007. Worms, with 9 percent and backdoors, with 5 percent, were the other malicious codes that caused the most infections.

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