A MultifacetedApproach to Understanding the Botnet Phenomenon为了了解僵尸网络现象的一个多方面的方法.pptVIP

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A MultifacetedApproach to Understanding the Botnet Phenomenon为了了解僵尸网络现象的一个多方面的方法.ppt

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A MultifacetedApproach to Understanding the Botnet Phenomenon为了了解僵尸网络现象的一个多方面的方法

A Multifaceted Approach to Understanding the BotnetPhenomenon Authors : Moheeb Abu Rajab, Jay Zarfoss, Fabian Monrose, Andreas Terzis Computer Science Department Johns Hopkins University Presented at : Internet Measurement Conference, IMC06, Brazil, October 2006 Presented By : Ramanarayanan Ramani Outline Working of Botnets Measuring Botnets Inference from Measurement Strengths Weaknesses Suggestions Botnets A botnet is a network of infected end-hosts (bots) under the command of a botmaster. 3 Different Protocols Used: IRC HTTP P2P Botnets (contd.) 3 Steps of Authentication Bot to IRC Server IRC Server to Bot Botmaster to Bot Measuring Botnets Three Distinct Phases Malware Collection Collect as many bot binaries as possible Binary analysis via gray-box testing Extract the features of suspicious binaries Longitudinal tracking Track how bots spread and its reach Measuring Botnets Malware Collection Nepenthes is a low interaction honeypot Nepenthes mimics the replies generated by vulnerable services in order to collect the first stage exploit Modules in nepenthes Resolve DNS asynchronous Emulate vulnerabilities Download files – Done here by the Download Station Submit the downloaded files Trigger events Shellcode handler Malware Collection Honeynets also used along with nepenthes Catches exploits missed by nepenthes Unpatched Windows XP are run which is base copy Infected honeypot compared with base to identify Botnet binary Gateway Routing to different components Firewall : Prevent outbound attacks self infection by honeypots Detect Analyze outgoing traffic for infections in honeypot Only 1 infection in a honeypot Several other functions Binary Analysis Two logically distinct phases Derive a network fingerprint of the binary Derive IRC-specific features of the binary IRC Tracker Use template to mimic bot Connect to real IRC server Communicate with botmaster using bot “dialect” Drones modified and used to act as IRC Client by the tracker to Cover lot