Distributed denial of service

Security in Computing (3rd Edition)

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1 Large Botnets and Distributed Denial of Service Attacks CS 161/194-1 Anthony D. Joseph October 28, 2005 October 26, 2005 CS161 Fall 2005 Joseph/Tygar/Vazirani/Wagner 2 Outline What is a botnet? How to create and use a botnet The money trail… Distributed Denial of Service Attacks • Examples October 26, 2005 CS161 Fall 2005 Joseph/Tygar/Vazirani/Wagner 3 What is a Botnet? A network of compromised machines – See last lecture for compromise techniques Zombies connect to server(s) – Typically one or more IRC servers running on zombies – Some botnets use custom encrypted protocols Zombies await commands or perform pre- determined actions (e.g., send spam) – Some botnets require authenticated commands – Commands can be scripts or executables October 26, 2005 CS161 Fall 2005 Joseph/Tygar/Vazirani/Wagner 4 Creating and Using a Botnet IRC server Attack! Attack! Attack! Attack! You have 500 new msgs October 26, 2005 CS161 Fall 2005 Joseph/Tygar/Vazirani/Wagner 5 Botnets Typically rented to “users” – Cost depends on metrics of botnet Important metrics (“bragging rights”) – Number of machines (1,000’s – 100,000’s) – Aggregate bandwidth (gigabits – terabits)
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