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CIS 442- Chapter 3

CIS 442- Chapter 3. Worms. Worms. Biological and computer worms Definition, main characteristics Differences from Viruses Bandwidth consumption and speed of propagation DOS attack. Code Red I. History of first Worm Vulnerability : IIS Payload or Damage Nature of access Propagation.

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CIS 442- Chapter 3

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  1. CIS 442- Chapter 3 Worms

  2. Worms • Biological and computer worms • Definition, main characteristics • Differences from Viruses • Bandwidth consumption and speed of propagation • DOS attack

  3. Code Red I • History of first Worm • Vulnerability : IIS • Payload or Damage • Nature of access • Propagation

  4. Speed of Propagation • Challenge of accessing a large number of computers based on their IP addresses • Searching all computers for those that have the exposed vulnerability

  5. Code Red II • Differences or enhancements in comparison with Code Red I: vulnerability, payload, etc. • Nimda as an extension to Code Red II

  6. Worming techniques • How worms search for vulnerabilities ? • How worms find computers that have exposed vulnerabilities ? • SYN packets • Hit list scanning • Methods to prepare initial candidate lists of IP addresses to scan.

  7. Permutation scanning • Permutation: writing a program to scan all possible combinations • Use many computers to optimize scanning and reduce the time to complete scanning the entire IP addresses table. • Topological scanning • Flash worms • Contagion

  8. Peer to Peer networks • P2P system architecture characteristics • Relation with worms • Applications and websites using P2P. • Reasons why P2P are good to spread worms through.

  9. Worms communications • Passive and active worms • Proposing a CCDC: Internet emergency center • Reasons to have CCDC. • Identifying outbreaks.

  10. CCDC-Analyzing new worms. • How experts discover worms ? • How they find ways to counter attack them? • Time challenge ? Find worms quickly before they spread, find ways to treat from worms. • Anticipating new threats • Public involvement

  11. Internet worm • Worm guessing passwords • Methods for good selection of passwords and bad selections of passwords • Iphone worms

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