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2. Z. Ramzan, C. Wueest: Phishing attacks: analyzing trends in 2006, Conference on Email and Anti-Spam (August 2007)
3. Symantec, Inc.: Symantec report on the underground economy (November 2008), available at http://www.symantec.com/business/theme.jsp?themeid=threatreport
4. C. Wueest: Personal communication (2008)
5. M. Jakobsson, Z. Ramzan: Crimeware: Understanding New Attacks and Defenses (Addison Wesley, Boston, MA 2008)