Security firm Symantec is warning users of a newly discovered Trojan horse named Phel - an anagram of the word help - that attacks Windows XP. The Trojan horse is capable of remotely controlling a user's system even if the latest Windows XP service pack, SP2, has been installed.

The Trojan horse, distributed as an HTML file, attempts to exploit a vulnerability in Internet Explorer's HTML Help Control component in all versions of Windows. The vulnerability was discovered in October.

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