Michalis Polychronakis Niels Provos Ghost Turns Zombie: Exploring the Life Cycle of Web-based Malware. 2008 LEET http://www.usenix.org/events/leet08/tech/full_papers/polychronakis/polychronakis.pdf conf/nsdi/2008leet db/conf/nsdi/leet2008.html#PolychronakisP08