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Trojan Horse Poses As Windows XP Update: Page 2 of 3

Lies. All lies.

"The Trojan definitely downloads malicious code and installs it on the system," confirmed Dunham. By his analysis, Trojan.Xombe downloads a back-door IRC Trojan horse to the compromised machine. Once that's installed, attackers can access the PC undetected, add other code to the computer -- such as key trackers for acquiring passwords -- and use the machine to launch DoS attacks on other machines.

Trojan.Xombe, and socially engineered attacks like it -- including phishing expeditions such as the MiMail worm, another exploit that pretends to be something it isn't in the hope that people will open the file attachment -- are the confirmation security professionals were looking for that 2004 will be a rough, rocky year.

"Attackers use the social engineering trends of the moment," said Vincent Weaver, senior director of Symantec's security response center. Touting a security update is only natural for hackers, he added, what with the increased awareness of many computer users of ongoing security issues with Windows.

Trojan.Xombe is also a good example of another trend first spotted in 2003, but certain to continue this year, said Dunham.