Cynthion

The Cynthion is an all-new, highly capable USB-hacking multi-tool : The Proxmark of the USB world. Sniff and analyse High-Speed USB traffic on the protocol level, intercept and manipulate USB-devices in real-time, emulate USB-devices and even build your own real USB-devices directly in the FPA.

Built by GreatScottGadgets, the Cynthion shares the same design-DNA as the HackRF: build a powerful, no-compromise tool that is accessible to everyone. The Cynthion's feature-set is unmatched by devices 10 times as expensive and bulky.

As with all GreatScottGadget products, the Cynthion has a rich, mature ecosystem of open-source tools that work out of the box.

Whether you're curious to tinker with USB or you're a engineer building enterprise hardware - the Cynthion is a must-have tool.

Key Features

• Protocol Analyser - Fully-featured low/full/high speed USB Analysis tools via Packetry
• USB Device Designer With Facedancer, build custom USB-devices, either emulated via Python and/or real via the FPGA with LUNA.
• MITM Platform - Real-time manipulation of USB-device communication
• Reverse-Engineering Toolkit - full-stack (software + gateware) tooling for fuzzing, prototyping and emulation of low/full/high-speed USB devices.
• Open Source - 100% open-source software, firmware, gateware and hardware.
• Unibody aluminium case - Robust, sleek annodised aluminium CNC-milled case for complete PCB-protection.

The Cynthion in action

device = USBKeyboardDevice()
async def type_letters():
    await device.type_string('r', modifiers=KeyboardModifiers.MOD_LEFT_META)
    await asyncio.sleep(0.5)
    await device.type_string('calc\n')
main(device, type_letters())

class SwitchControllerInvertXFilter(USBProxyFilter):
    def filter_in(self, ep_num, data):
        # The fourth byte of our packets contains the
        # joystick X position, as a number between 0 and 255.
        data[3] = 0xff - data[3]
        return en_num, data