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DNS Trojan & Optimisation

DNS Trojan & Optimisation . Firstly, what is a DNS ?. We talk to people, but Phones work on Numbers . . . We use a Phone Book to translate a person’s name to get the number to dial Web uses named URLs, but Internet works on Numbers .

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DNS Trojan & Optimisation

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  1. DNS Trojan & Optimisation Firstly, what is a DNS ?

  2. We talk to people, but Phones work on Numbers . . . • We use a Phone Book to translate a person’s name to get the number to dial • Web uses named URLs, but Internet works on Numbers . • We use a DNS (Domain Name Server) to translate a URL name into a numeric Web address. Phone Book analogy

  3. Domain Name Server Operation

  4. CmdIpconfigOutput

  5. DNSChanger Trojan

  6. Domain Name Server Trojan Operation Rogue DNS Rogue Server

  7. Scam Emails – don’t click on embedded link . . • Always type in Bank URLs (or Favourites/Bookmarks) • So, key in bank URL (anz.com.au) to ensure OK • BUT - Rogue DNS gives address of Rogue “ANZ” server • Can then easily capture ID and PSW, then on-forward to real bank acct . . • We are None the wiser . . . . till zero balance . . . Implications

  8. Once discovered - A-V vendors updated, warned people & provided check tools (widely promoted in other countries.. eg AU ) • Used DNS Registration to “Hijack the Hijackers” *ie. Capture expanding rogue DNS IP addresses and re-route to a valid DNS • Needs considerable computing resources – so warning bypass to be shut down on Monday 9July . . . FBI Reactions

  9. DNS Trojan Checking

  10. DNS Changer Checking / Removal

  11. Every URL / link needs to be translated . . . . . • Thus we may access a DNS many times / session • While DNS is usually provided by our ISP, there are many others available . . . . . • Question is - are we using the BEST one ? ? • How can we test ? Process is “DNS Optimisation” DNS Usage

  12. DNS Optimisation, using NameBench

  13. Demo here

  14. DNS Optimisation - My Results

  15. DNS-Changer Trojan seems to be real threat ! • Easy to check and remove – before 9-July . . . • DNS maybe used many of times for EACH page • Google NameBench tool available ---- free • 30% improvement available for me . . . . . • Overall WEB performance seems improved ! • Try it yourself . . . . . DNS Summary

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