Trojans caused most infections

According to data gathered by Panda Security, Trojans (25%) and adware (23%) were the malware that caused most computer infections in November.

December 6, 2007
Trojans caused most infections

“This has been the trend throughout the year. The reason behind is the fact that both malware types allow cyber-crooks to obtain financial benefit: Trojans through theft of confidential data like banking and e-mail passwords, and adware through companies that pay cyber-crooks to display unsolicited advertising of their products through pop-ups, banners, etc.,” explains Jeremy Matthews, CE of Panda Security SA

Worms (9%) were the third type of most harmful malware in November, far behind Trojans and adware. Backdoors (4%), spyware (3%), dialers (3%) and bots (2%) were the culprit for the rest of infections.

“31% of infections have been grouped under the heading ‘others’. This refers to multiple malware types (viruses, hacking tools, PUPs, etc.) which, even though they don’t account for a large percentage of infections separately, they do so when put together. This also proves that today there is a greater variety of malware than ever,” says Matthews.

The most active malicious codes

The ranking of malware that most computers have infected is headed by the Downloader.MDW Trojan, designed to download other malicious code onto systems.

Second place is for Lineage.BZE, created to steal passwords for online games.

The third most harmful malicious code in November was Brontok.H, a worm that spreads by sending e-mails and copying itself to the computers it infects.

Fourth and fifth place are taken by the Puce.E and Autorun.DZ worms respectively followed by the VideoAddon adware created to display ads in pop-ups.

Seventh place is taken by Dropper.UN, whereas the Perlovga.A worm comes eight. The Hupigon.AZG backdoor and the PC-Prot adware occupy the last positions in the ranking.

 

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