The worm, dubbed Santy.A, uses a vulnerability in a popular free software package called phpBB to spread across the Internet, infecting computer servers that host online bulletin boards and defacing those sites with the words "This site is defaced!!! NeverEverNoSanity WebWorm."
Google Squashes Santy Worm
Published: December 21, 2004
http://news.com.com/Google+squashes+San ... g=nefd.hedAntivirus companies say the Santy worm, which searches Google for sites that use a vulnerable version of the phpBB bulletin board software, was spreading quickly and had already infected about 40,000 Web sites by Tuesday evening.
On Wednesday, a Google representative told ZDNet Australia that though Google users were not at risk from Santy, the search company had started blocking attempts by the worm to replicate.