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I've no reason to return your UIN you back (sic) for free.' 'You want your UIN back, I want your 100 dollars,' reads part of an ICQ exchange with the hijacker forwarded to CNET by Ficken. Still, this week's heist may have been the cheekiest yet: According to Ficken, the hijacker demanded $100 to fork over the UIN. Six months ago, for example, a Trojan horse virus was blamed in the theft of hundreds of ICQ passwords. Six-digit UINs like Ficken's, which were handed out in ICQ's early days, are considered hip by some hackers and have been hijacked repeatedly.

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Once on a hard drive, the virus is free to cause any number of problems, from stealing passwords to destroying files.

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As a result, he said, ICQ and other instant messaging services, such as AOL Instant Messenger (AIM), are extremely vulnerable to Trojan horse viruses, so called because the virus is concealed inside an innocent-looking file that people are encouraged to download onto their computers. He added that AOL routinely warns customers to use precautions against such security breaches, advising them to avoid downloading files from unknown sources, for example.Д«ut according to Huger, many instant messaging users don't exercise enough caution. 'The security of ICQ customers is a top priority,' he said. The excess characters in some cases can be run as 'executable' code, effectively giving the attacker control of the computer without being constrained by security measures.Д'Amato said AOL is working to fix the buffer overflow problem. In a buffer overflow, the attacker floods a field, typically an address bar, with more characters than it can accommodate. 'There have been a number of exploits involving ICQ,' said Alfred Huger, vice president of engineering at the security firm, which lists three known ICQ exploits on its Web site, including the buffer overflow identified on Bugtraq. Just last month, for example, the security mailing list Bugtraq reported that using a link to a Web site embedded in an ICQ message creates a glitch, called a ' buffer overflow,' that can be used by a malicious programmer to gain control of a computer.

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The service, which lets people know when friends and colleagues are available for online chats and enables a kind of electronic conversation, has inspired numerous competitors-including Microsoft, Yahoo and AOL-to create similar services.Дespite ICQ's success, the software remains highly unsecure, according to Net security experts. ICQ is the instant messaging leader, having signed up more than 60 million registered users since its launch.

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But he said this week's attack appeared to be an isolated incident and probably involved a so-called Trojan horse virus that was used to steal Ficken's password and take control of the account. He said AOL does not yet know how Ficken's account was compromised. 'I stood to lose four years' worth of business contacts,' said Dale Ficken, a Webcasting consultant, who was locked out of his account for two days.ДЄOL spokesman Rich D'Amato said the company is investigating the incident. The company returned the UIN to the original owner today. In the latest security breach affecting the popular ICQ instant messaging service, a Web consultant says his account was held hostage this week by a hacker who took over his user number and tried to pry a ransom out of the deal.ДЄmerica Online, which purchased ICQ last year, confirmed that an unauthorized person this week made off with a long-time customer's password and user identification number (UIN).