It is a webworm that attacks all php sites that use a certain version. German speakers can read more here: http://www.heise.de/newsticker/meldung/54504 Explanation of the PhBB site: http://www.phpbb.de/viewtopic.php?t=73427 Workaround if you can't upgrade the phb version: http://www.phpbb.com/phpBB/...