USBSamurai — A Remotely Controlled Malicious USB HID Injecting Cable for less than 10$

Luca Bongiorni
Aug 15, 2019 · 3 min read

TL;DR: The Video is self-explanatory. (Wanna know how to make it? Read the article below.)

All started with this Tweet last April, when I wanted a damn cheap USB implant capable of injecting keystrokes.

It had to be:

  • Remotely Controllable
  • Fast in Typing
  • Tiny as f***k
  • Cheaper than a bottle of Vodka

The main idea (for the hardware-side) is to re-use the Logitech’s inexpensive Unifying dongles as implants within USB cables.

To give you an idea… this is how much this dongle cost (CU-0007): 7.74 EURO!

What you need to do is DEAD SIMPLE:

  • Remove the top black case without breaking the dongle;
  • PULL out the PCB & the orange plastic holder [gently hold the metal case with a vice (use gum for projecting it) then with a pair of pliers gently but firmly pull out the stuff];
  • Pop-open an USB Cable (I do suggest either [1] or [2]) and solder the Vcc& GND to their related pins on the CU-0007.
  • Once everything will be in place, mount back the metal case of the USB male connector.
  • Then check if it fits the USB case and glue it with a drop of super-glue.

DONE. Congrats! You just created your First USBsamurai!

Now you just need to pair it with @mame82’s LOGITacker v.0.1.3-beta and you are ready to pwn targets!

Remember to first unpair all pre-paired devices: with the command munifying unpairall

G700 firmware is limited to one paired device per time!

For the Software-side, the good @mame82 came to help with his majestic LOGITacker framework!

So far it supports 4 different NRF-based boards:

  • Nordic nRF52840 Dongle
  • MakerDiary MDK Dongle
  • MakerDiary MDK
  • April Brother nRF52840 Dongle

I personally opted for the 4th one [3] since is the only one with external Antenna (i.e. Longer Range).

https://github.com/mame82/LOGITacker#24-april-brother-nrf52840-dongle

Just follow LOGITacker’s readme and install the v.0.1.3-beta and install https://github.com/mame82/LOGITacker/releases/download/v0.1.3-beta/logitacker_aprdongle.uf2

I recorder a video to explain how to easily pair USBsamurai with LOGITacker.

Enjoy :)

[1] https://aliexpress.com/item/33052091501.html

[2] https://aliexpress.com/item/32771548306.html

[3] https://www.aliexpress.com/item/32975184100.html

Luca Bongiorni

Written by

Non aetate verum ingenio apiscitur sapientia / Omnia silendo ut audeam nosco / There is no deduction for excellence / Tweets are my own

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