But the tool bar was actually an executable file which installed a Trojan virus that then displayed a fake security alert when the PC was rebooted.
Instead of being a targeted cyberwarfare attack, this malware is simply a run-of-the-mill trojan virus that travels by "sneakernet, " the tongue-in-cheek name for the transmission of viruses across unconnected computers by hand (or foot) in the days before widespread Internet connectivity.
Last week, a Russian security company reported that as many as 600, 000 Macs, most of them in the United States and Canada, had been infected by Flashback, a Trojan horse virus that infiltrates computers, secretly giving someone else remote access to them.
With Simon Howard, CoreTrace put together an obstacle course in which contestants had to create Trojan horse viruses to bypass anti-virus software.
F-Secure also offers protection against the Palm OS Phage.963 virus and the Palm Liberty Trojan, both of which have come to the public's attention.
Once launched, the virus is designed to install a Trojan horse or backdoor program, and allow investigators to record everything typed into that machine, thereby getting around encryption and passwords.
This led to the virus used by the gang being dubbed the "Storm Trojan".
Antivirus researchers are examining a new Trojan horse that could pose more of a threat than the Cabir virus, which only spread by Bluetooth (which means Paris Hilton's Sidekick would not, we repeat, would not be vulnerable to the Cabir Trojan).
One way is to deliver the bit of the virus you want the killer cells to respond to using another virus which doesn't cause human disease a sort of vaccine Trojan horse.
Schrader said the best defense against Trojan Horse e-mail viruses is end-user education -- and, of course, updated virus-scanning software.
School officials determined the virus was similar to Onel de Guzman's thesis, called E:mail Password Sender Trojan, which was designed to obtain Windows passwords, and retrieve Internet accounts from victims' computers.
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