Botnets have become the platform of choice for launching attacks and committing fraud on the Internet. A better understanding of Botnets will help to coordinate and develop new technologies to counter this serious security threat.Botnet Detection: Countering the Largest Security Threat, a contributed volume by world-class leaders in this field, is based on the June 2006 ARO workshop on Botnets. This edited volume represents the state-of-the-art in research on Botnets. It provides botnet detection techniques and response strategies, as well as the latest results from leading academic, industry and government researchers.Botnet Detection: Countering the Largest Security Threat is intended for researchers and practitioners in industry. This book is also appropriate as a secondary text or reference book for advanced-level students in computer science.  Botnets have become the platform of choice for launching attacks and committing fraud on the Internet. A better understanding of Botnets will help to coordinate and develop new technologies to counter this serious security threat. Botnet Detection: Countering the Largest Security Threat, a contributed volume by world-class leaders in this field, is based on the June 2006 ARO workshop on Botnets. This edited volume represents the state-of-the-art in research on Botnets. It provides botnet detection techniques and response strategies, as well as the latest results from leading academic, industry and government researchers. Botnet Detection: Countering the Largest Security Threat is intended for researchers and practitioners in industry. This book is also appropriate as a secondary text or reference book for advanced-level students in computer science. Botnet Detection Based on Network Behavior 1(24) W. Timothy Strayer David Lapsely Robert Walsh Carl Livadas Honeynet-based Botnet Scan Traffic Analysis 25(20) Zhichun Li Anup Goyal Yan Chen Characterizing Bots' Remote Control Behavior 45(20) Elizabeth Stinson John C. Mitchell Automatically Identifying Trigger-based Behavior in Malware 65(24) David Brumley Cody Hartwig Zhenkai Liang James Newsome Dawn Song Heng Yin Towards Sound Detection of Virtual Machines 89(28) Jason Franklin Mark Luk Jonathan M. McCune Arvind Seshadri Adrian Perrig Leendert van Doorn Botnets and Proactive System Defense 117(14) John Bambenek Agnes Klus Detecting Botnet Membership with DNSBL Counterintelligence 131(12) Anirudh Ramachandran Nick Feamster David Dagon A Taxonomy of Botnet Structures 143 David Dagon Guofei Gu Christopher P. Lee