Abstract
As a complex,flexible and effective platform for network attacking,the botnet spreads widely in the Internet.Botnets can provide the botmasters with the ability to launch large-scale malicious activities such as spamming and DDoS(Distributed Denial of Service) attacks.Botnets are continuously bringing more and more severe threats,so that the study on botnets has already become one of the focuses in the field of network security.However,in recent years,some new developments of botnets are challenging the existing understanding on botnets.In this paper,according to the new conditions of botnets and the researches in existence,a definition of botnet is proposed based on the works of other researchers,taxonomies of botnets are introduced respectively from the views of network structure,dependency and delivery pattern of CC(Command and Control) information.Then the techniques on detecting,measuring and restraining botnets are analyzed systematically.In the end,we give the evolution trends of botnets and the future research trends in this area.
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