Just guessing here, but could it be that it lives only on Linux systems. In the article, it sais that the worm uses wget. While wget can be found on Windows also, Windows has more viable alternatives :)
And, for sure, "Linux worm" gets more readers than yet another "PHP exploit". :)
And, for sure, "Linux worm" gets more readers than yet another "PHP exploit". :)
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Link to this comment: http://www.securityfocus.com/comments/newsbriefs/38/170#170