Online miscreants have released a Trojan horse that can infect computers running Microsoft’s Windows XP, installing programs to remotely control a victim’s system.

Symantec warned in an advisory this week that the program - dubbed "Phel", an anagram of "Help" - infects visitors to a maliciously created website through Internet Explorer’s Help controls. A bug in the malicious program may prevent it from infecting some computers, the security company said.

The Symantec advisory can be found on the company’s website.

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