Unknown to users, the worm connects their PC to a custom IRC channel when they are logged on to a remote server while surfing the Web or reading e-mail.

CNN: New 'Trojan Horse' strain may go mainstream

According to the ETF Finder at ETF Channel, IRC makes up 3.38% of the KBW Premium Yield Equity REIT Portfolio ETF ( AMEX: KBWY )which is trading higher by about 0.8% on the day Thursday.

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All four of the men, who were arrested in December 2010 and January 2011, were already on bail and banned from accessing Internet Relay Chat (IRC) networks, a popular channel for communicating among supporters of Anonymous, a nebulous collective of web activists and pranksters.

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Once connected to an IRC, the creator of the custom channel or his robot program can download the victim's files, passwords, log-in data, operating system preferences and other personal information -- including stored credit-card numbers.

CNN: New 'Trojan Horse' strain may go mainstream