Marco Cova Christopher Kruegel Giovanni Vigna There Is No Free Phish: An Analysis of "Free" and Live Phishing Kits. 2008 WOOT http://www.usenix.org/events/woot08/tech/full_papers/cova/cova.pdf conf/uss/2008woot db/conf/uss/woot2008.html#CovaKV08