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Stuxnet

Stuxnet. Sam Skalicky Biru Cui. Outline. Discovery Architecture Evaluation Conclusion. Discovery. VirusBlokAda Zero-day Microsoft Stuxnet <= . stu b + Mr xNet .sys Symantec. Architecture. Organization Installation Propagation Target & Process. Architecture. Organization

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Stuxnet

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  1. Stuxnet Sam Skalicky Biru Cui

  2. Outline • Discovery • Architecture • Evaluation • Conclusion

  3. Discovery • VirusBlokAda • Zero-day • Microsoft • Stuxnet <= .stub + MrxNet.sys • Symantec

  4. Architecture • Organization • Installation • Propagation • Target & Process

  5. Architecture • Organization • Exports • Resources • Configuration

  6. Architecture • Installation • E 15: environment scan, escalation • E 16: copy, hide, autorun (certificate)

  7. Architecture • Propagation • WinCC SQL • P2P RPC • Printer spooler • Removable disk • .lnk, ~WTR4141.tmp, ~WTR4132.tmp • Autorun.inf

  8. Architecture • Target • Step 7 (E2/E14) • PLC • Data Blocks (DB) • System Data Blocks (SDB) • Organization Blocks (OB) • Function Blocks (FC)

  9. Architecture • Process • Broker • FC: RECV • OB1/OB35

  10. Architecture • Process • Profibus ID • CP • Frequency converter

  11. Architecture • Process • 1.41kHz 1.064kHz 2Hz

  12. Evaluation • Complex • code size • propagation methods • zero-day exploit • certificate steal • specific target Step/PLC/FC

  13. Speculation • Where

  14. Speculation • What

  15. Risk • Very small risk to the majority of users • Worm was target so specifically • Modifying large spinning motors to fail • Shorting out • Overheat • Disengage from their mounting • Consumes disk space (500KB) • New type of worm detected

  16. What’s next? • W32.Duqu, a new beginning?

  17. References • [1] “Frequently Asked Questions on Virus-L/comp.virus.” Internet: http://www.faqs.org/faqs/computer-virus/faq/, Oct. 9, 1995 [Jan. 7, 2012]. • [2] “MS10-061: Printer Spooler Vulnerability.” Internet: http://blogs.technet.com/b/srd/archive/2010/09/14/ms10-061-printer-spooler-vulnerability.aspx, Sept. 14, 2010 [Jan. 7, 2012]. • [3] Nicolas Falliere, Liam O Murchu, and Eric Chien, “W32.Stuxnet” Synmatec, November 2010. • [4] K. Zetter, “How Digital Detectives Deciphered Stuxnet, the Most Menacing Malware in History,” Internet: http://www.wired.com/threatlevel/2011/07/how-digital-detectives-deciphered-stuxnet/all/1, July 11, 2011

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