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Teensy Programming for Everyone

This was a workshop I conducted at Black Hat Europe'12. The workshop explains how to program a USB HID, Teensy++ in this case, for usage in offensive security.

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Teensy Programming for Everyone

  1. 1. Nikhil Mittal
  2. 2.  SamratAshok Twitter - @nikhil_mitt Blog – Creator of Kautilya Interested in Offensive Information Security, new attack vectors and methodologies to pwn systems. Previous Talks  Clubhack’10, Hackfest’11, Clubhack’11, Black hat Abu Dhabi’11 Upcoming Talks  Troopers’12, PHDays’12, Hack In Paris’12  Training at GrrCON’12
  3. 3.  A typical Pen Test Scenario How we are doing it Need for new methods to break into systems HID anyone?
  4. 4.  Introduction to Teensy Basics of Arduino Development Environment (ADE) Installing and configuring ADE to use with Teensy Understanding the basics of programming using ADE Writing Hello World Basic usage and programming of Teensy Introduction to Kautilya Demonstration of Payloads in Kautilya Program and perform attacks on a Windows machine Program and perform advanced attacks on a Windows machine Understanding structure of and automation using Kautilya Understanding Integration of payloads in Kautilya
  5. 5.  Protection against HID based attacks Pen Test Stories Limitations Future Conclusion
  6. 6.  Be as interactive as you can. Query me, ask nasty questions, insult me. It is mandatory to laugh on jokes, they be on slides or cracked by me. We will start slow and then pick up speed. Be patient if you know something, everybody is not good as you. I don’t have much theory so be ready to see demos and source code. Make sure you keep your eyes on. You should be able to program your device after this. I will keep checking if everyone is awake ;)
  7. 7.  A client engagement comes with IP addresses. We need to complete the assignment in very restrictive time frame. Pressure is on us to deliver a “good” report with some high severity findings. (That “High” return inside a red colored box)
  8. 8. Vuln Exploit ReportScan
  9. 9.  This is a best case scenario. Only lucky ones find that. Generally legacy Enterprise Applications or Business Critical applications are not upgraded and are the first targets. There is almost no fun doing it that way.
  10. 10. Enum Scan Exploit Report
  11. 11. Enum Post + Scan Exploit Report ExpIntel
  12. 12.  To gain access to the systems. This shows the real threat to clients that we can actually make an impact on their business. No more “so-what”  We can create reports with “High” Severity findings which bring $$$
  13. 13.  Memory Corruption bugs.  Server side  Client Side Mis-configurations Open file shares. Sticky slips. Man In The Middle (many types) Unsecured Dumpsters Humans <Audience>
  14. 14.  Many times we get some vulnerabilities but can’t exploit.  No public exploits available.  Not allowed on the system.  Countermeasure blocking it.  Exploit completed but no session was generated :P
  15. 15.  Hardened Systems Patches in place Countermeasures blocking scans and exploits Security incident monitoring and blocking No network access We need alternatives.
  16. 16.  Bad guys are getting smarter. Smart attacks of 2011  Sony (ok not so smart :P)  RSA (clever attack), chained to Lockheed Martin  Epsilon (Spear Phishing)  Barracuda Networks (WAF turned off for little while)  Some attacks on India Smart attacks of 2010  Stuxnet  Operation Aurora And Many more (like Apache in 2009)
  17. 17.  Breaking into systems is not as easy as done in the movies. Those defending the systems have become smarter (at many places :P) and it is getting harder to break into “secured” environments. Everyone is breaking into systems using the older ways, you need new ways to do it better.
  18. 18.  Wikipedia – “A human interface device or HID is a type of computer device that interacts directly with, and most often takes input from, humans and may deliver output to humans.” Mice, Keyboards and Joysticks are most common HID. What could go wrong?
  19. 19.  A USB Micro-controller device. Storage of about 130 KB. We will use Teensy ++ which is an updated version of Teensy.
  20. 20.  Really cool projects.
  21. 21.  Install Arduino Windows Serial Installer (only Windows) Install Teensyduino Copy Teensy loader executable in Arduino directory. Detailed with screenshots here:
  22. 22.  Make sure to select correct “Board” and “USB Type” under Tools menu item. If Teensyduino has been installed properly, sketch examples could be found at File->Examples->Teensy
  23. 23.  Almost C++ like syntax is used in ADE Two functions are required at minimum  setup() which runs whenever Teensy is plugged or restarted.  loop() which keeps running after setup() Basic usage and programming of Teensy Writing Hello World with Teensy.
  24. 24. DEMO, Source Code and Programming
  25. 25.  It’s a toolkit which aims to make Teensy more useful in Penetration Tests. Named after Chanakya a.k.a. Kautilya. Written in Ruby. It’s a menu drive program which let users select and customize payloads. Aims to make Teensy part of every Penetration tester’s tool chest.
  26. 26.  Payloads are written for teensy without SD Card. Pastebin is extensively used. Both for uploads and downloads. Payloads are commands, powershell scripts or combination of both. Payload execution of course depends on privilege of user logged in when Teensy is plugged in. Payloads are mostly for Windows as the victim of choice generally is a Windows machine. 
  27. 27.  Adds a user with Administrative privileges on the victim. Uses net user command.
  28. 28.  Changes the default DNS for a connection. Utilizes the netsh command.
  29. 29.  Edit hosts file to resolve a domain locally.
  30. 30.  Enables RDP on victim machine. Starts the service. Adds exception to Windows firewall. Adds a user to Administrators group.
  31. 31.  Installs Telnet on victim machine. Starts the service. Adds exception to Windows firewall. Adds a user to Administrators group and Telnetclients group..
  32. 32.  Starts an invisible instance of Internet Explorer which browses to the given URL.
  33. 33.  Downloads an exe in text format from pastebin, converts it back to exe and executes it.
  34. 34.  Using registry hacks, calls user defined executable or command when Shift is pressed 5 times or Win + U is pressed. When the system is locked, the called exe is executed in System context.
  35. 35.  Uninstalls an msiexec application silently.
  36. 36.  This payload uses opens up chrome, launches Remote Desktop plugin, enters credentials and copies the access key to pastebin. This payload operates on browser window.
  37. 37.  Dumps valuable information from registry, net command and hosts file.
  38. 38.  This payload pulls the sniffer powershell script (by Robbie Fost) and executes it on the victim. The output is compressed and uploaded to ftp.
  39. 39.  This payload pulls powerdump script of msf from pastebin, schedules it as taks to run in system context and upload the hashes to pastebin.
  40. 40.  This payload logs keys and pastes it to pastebin every twenty seconds. There is a separate script to parse the output.
  41. 41.  This payload creates a hosted network with user define SSID and key. It also adds a user to Administrators and TelnetClients group. It installs and starts telnet and adds it to windows firewall exception.
  42. 42.  This payload forces the victim to connect to an attacker controlled WiFi AP. The AP in this case is portable WiFi hotspot on a smartphone. Using this either payloads can be pulled from the smartphone or the internet using the AP thus effectively bypassing any internet restriction policies on the system.
  43. 43.  This payload uses the powershell code execution script (by Matt from exploit- monday blog). A meterpreter shell is executed completely in memory using this script.
  44. 44.  This payload browses in background to a url where Metasploit Java Signed Applet module is hosted and accepts the run prompt after few seconds.
  45. 45.  We were doing internal PT for a large media house. The access to network was quite restrictive. The desktops at Library were left unattended many times. Teensy was plugged into one system with a sethc and utilman backdoor. Later in the evening the system was accessed and pwnage ensued.
  46. 46.  A telecom company. We had to do perimeter check for the firm. The Wireless rogue AP payload was used and teensy was sold to the clients employees during lunch hours. Within couple of hours, we got a wireless network with a administrative user and telnet ready.
  47. 47.  A pharma company. We replaced a user’s data card with a Teensy inside the data card’s cover. The payload selected was Keylogger. “Data card” obviously didn’t worked and we got multiple keylogging for the user and the helpdesk. Helpdesk guys had access to almost everything in the environment and over a workday, it was over.
  48. 48.  Use Endpoint Protector 4 :P :P Group Policy in Windows which prevent installation of hardware devices.
  49. 49.  Limited storage in Teensy. Resolved if you attach a SD card with Teensy. Inability to “read” from the system. You have to assume the responses of victim OS and there is only one way traffic.
  50. 50.  Many payloads need Administrative privilege. Lots of traffic to and from pastebin. Inability to clear itself after a single run. Not very stable as it is still a new tool and has not gone through user tests. For payloads which use executables you manually need to convert and paste them to pastebin.
  51. 51.  Improvement in current payloads. Implementation of SD card. Use some payloads as libraries so that they can be reused. Support for Non-English keyboards. Maybe more Linux payloads. Implementation of some new payloads which are under development.
  52. 52.  Please complete the Speaker Feedback Surveys. Questions? Insults? Feedback? Kautilya is available at Follow me @nikhil_mitt

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  • girindrachandra

    Jun. 4, 2014
  • luizvieira

    Nov. 25, 2014

This was a workshop I conducted at Black Hat Europe'12. The workshop explains how to program a USB HID, Teensy++ in this case, for usage in offensive security.


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