Editing Zombie (computing) (section)

==Advertising==

Zombie computers have been used extensively to send [[Email spam|e-mail spam]]; as of 2005, an estimated 50&ndash;80% of all spam worldwide was sent by zombie computers.<ref>{{Cite web |author=Tom Spring |date=June 20, 2005 |url=http://www.pcworld.com/article/121381/article.html |title=Spam Slayer: Slaying Spam-Spewing Zombie PCs |publisher=PC World |access-date=December 19, 2015|archive-date=July 16, 2017|archive-url=https://web.archive.org/web/20170716042122/http://www.pcworld.com/article/121381/article.html|url-status=live}}</ref> This allows [[spammer]]s to avoid detection and presumably reduces their [[Bandwidth (computing)|bandwidth]] costs, since the owners of zombies pay for their own bandwidth. This spam also greatly increases the spread of [[Trojan horse (computing)|Trojan horses]], as Trojans are not self-replicating. They rely on the movement of e-mails or spam to grow, whereas worms can spread by other means.<ref>{{cite book|title=Managing Information in the Public Sector|page=221|first=Jay D.|last=White|publisher=M.E. Sharpe|year=2007|isbn=978-0-7656-1748-4}}</ref> For similar reasons, zombies are also used to commit [[click fraud]] against sites displaying [[pay-per-click]] advertising. Others can host [[phishing]] or [[money mule]] recruiting websites.