On the Effects of Registrar Level Intervention
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On the Effects of Registrar-level Intervention He (Lonnie) Liu Mark Felegyhazi Kirill Levchenko Christian Kreibich Geoffrey M. Voelker UC Berkeley Stefan Savage ICSI UC San Diego 1 Spam 2 Spam Infrastructure • Mail address harvesting • Botnet mail senders • Domain names • Proxies and redirections • Web hosting • etc. 3 Spam Infrastructure • Mail address harvesting • Botnet mail senders • Domain names • Proxies and redirections • Web hosting • etc. 4 Spam http://buyrxpills.com/ 5 Domain Name System (DNS) (root) Registries .com .net … .cn .ru .au … Registrars eNom GoDaddy Tucows … Authoritative ns1.buyrxpills.com ns2.buyrpills.com … Name Servers End User Recursive ns.ucsd.edu Name Servers buyrxpills.com=? 6 Domain Name System (DNS) (root) Registries .com .net … .cn .ru .au … Registrars eNom GoDaddy Tucows … Authoritative ns1.buyrxpills.com ns2.buyrpills.com … Name Servers End User Blacklists Recursive ns.ucsd.edu Name Servers buyrxpills.com is bad! buyrxpills.com=? 7 Domain Name System (DNS) (root) Registries .com .net … .cn .ru .au … Registrars eNom GoDaddy Tucows … Authoritative ns1.buyrxpills.com ns2.buyrpills.com … Name Servers End User Take downs Recursive ns.ucsd.edu Name Servers buyrxpills.com=? 8 Domain Name System (DNS) Increase Price (root) Take downs Registries .com .net … .cn .ru .au … Registrars eNom GoDaddy Tucows … Authoritative ns1.buyrxpills.com ns2.buyrpills.com … Name Servers End User Recursive ns.ucsd.edu Name Servers buyrxpills.com=? 9 Two Registration Policy Changes 2008 2009 2010 2011 10 Two Registration Policy Changes Dec. 2009 2008 2009 2010 .cn 2011 11 Two Registration Policy Changes Dec. 2009 2008 Sep. 2010 2009 2010 .cn 2011 12 Our Approach • Collect spam domains from spam feeds • Track DNS name server activities – Zone files • Track registration info – WHOIS, DomainTools.com (historic WHOIS service) • Tagged pharmacy domains – Click Trajectory (Oakland ‘11) 13 December, 2009 .cn 14 Cost of a .cn Domain 2007-2008 = (15 cents) 15 Cost of a .cn Domain 2007-2008 = (15 cents) 16 Cost of a .cn Domain 2007-2008 business license (photocopy) (15 cents) 17 Cost of a .cn Domain registrant id (photocopy) 2007-2008 business license (photocopy) (15 cents) 18 Cost of a .cn Domain registrant id (photocopy) 2007-2008 Dec 14, 2009 business license (photocopy) (15 cents) 19 Cost of a .cn Domain 2007-2008 Dec 14, 2009 = (15 cents) 20 Cost of a .cn Domain 2007-2008 Dec 14, 2009 = = (10 dollars) (15 cents) 21 Cost of a .cn Domain 2007-2008 Dec 14, 2009 = = (10 dollars) (15 cents) +6800% 22 New Created Domains New Spam Advertised New Blacklisted 23 New Created Domains New Spam Advertised New Blacklisted 24 New Created Domains New Spam Advertised New Blacklisted 25 CNNIC Policy Change • Spam domains are sensitive to prices • Spammers abandoned .cn domains • And start using .ru domains instead • Quickly adapted the changes 26 September 21, 2010 27 September 21, 2010 Internet Pharmacy Verification & Enforcement 28 September 21, 2010 Internet Pharmacy Verification & Enforcement 29 September 21, 2010 to Identify Customers Illegal Online Pharmacy 30 September 21, 2010 to Identify Customers Illegal Online Pharmacy 31 September 21, 2010 to Identify Customers Illegal Online clientHold Pharmacy the domain will remain on hold and may not be transferred 32 clientHeld eNom .com Domains State clienthold Number of Number of put domains to 33 clientHeld eNom .com Domains drugdrug, pill pill, rx rx viagra, viagra State clienthold Number of Number of put domains to 34 Global Impact 14,268 .com pharmacy domains From our spam feeds, identified by webpage contents 35 Global Impact 1,223 eNom (9%) 14,268 .com pharmacy domains 36 Global Impact 1,223 eNom (9%) 14,268 .com pharmacy domains ClientHold Still active(16%) (67%) Removed from zone file Transferred (5%) (12%) 37 Global Impact 1,223 eNom (9%) 14,268 .com pharmacy domains ClientHold Still active(16%) (67%) Removed from zone file Transferred (5%) (12%) 38 LegitScript - eNom Agreement • Noticeable effects on eNom domains – 7000+ domains put to clientHold – Scammers transferred to other registrars • The scale limits the global effects – 9% affected 39 Discussion: Defend at Registrar Level • Economic way: increase the price (CNNIC) – Significant effect, but alternatives available – Affects all .cn users, including legal ones • Social way: take down domains (LegitScript) – Similar to other takedowns, effects depends on scale and speed 40 Questions & Comments Thank you 41 .