It's no coincidence that one of the most recent Trojan horse programs to enter the FBI's bi-weekly rogues gallery of malicious code is named after an Internet porn company.

The program, dubbed "Cytron" by the bureau's National Infrastructure Protection Center (NIPC)and some anti-virus vendors, is a covert browser plug-in that gives Internet Explorer users something they probably don't want: more pop-up ads, promoting a slew of adult websites.

Users are lured into accepting the program through a wholesome e-mail from egreetings@yahoo.com -- a forged return address. The mail looks convincingly like an electronic greeting card notification, with a cute smiley face background and the text "You have received an e-card" in squiggly block letters.

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