1. Introduction
The Kaktus WHID (WiFi HID Injector) is a specialized USB device designed to emulate a human interface device (HID) such as a keyboard. It allows for the remote injection of keystrokes into a target computer via a Wi-Fi connection. This manual provides detailed instructions for its setup, operation, and maintenance.
Key Features:
- Remote Keystroke Injection: Send keystrokes to a target machine over Wi-Fi.
- ESP32-S2 Module: Equipped with an Xtensa single-core 32-bit LX7 microprocessor (up to 240 MHz).
- Integrated Memory: 128 KB ROM, 320 KB SRAM, and 4 MB embedded SPI flash memory.
- Hardware Cryptographic Accelerators: Supports AES, ECB/CBC/OFB/CFB/CTR, GCM, SHA, RSA, and ECC for enhanced security.
- Physical Security Functions: Includes transparent external flash and RAM encryption (AES-XTS), Secure Boot (RSA-PSS), and HMAC/digital signature modules.
- Integrated WiFi: 802.11 b/g/n 2.4 GHz transceiver (up to 150 Mbps).
- Temperature Sensor: Integrated sensor for temperature monitoring (-20°C to 110°C).
- Plug and Play: Designed for ease of use without requiring complex software installation for basic functions.
2. Package Contents
Please verify that all items are present in your package:
- 1 x WiFi HID Injector Unit
3. Product Overview
The Kaktus WHID is a compact USB device, typically white with red accents, designed for portability and discreet operation. It features a standard USB-A connector for interfacing with host systems.
Figure 3.1: Kaktus WHID WiFi HID Injector. This image shows the device with a WiFi symbol, indicating its wireless capabilities for sending keystrokes to a target machine.
Figure 3.2: Kaktus WHID with its protective cap removed, revealing the USB connector. This view highlights the device's compact form factor.
4. Specifications
| Feature | Specification |
|---|---|
| Material | ABS Plastic |
| Working Voltage | 3.0 - 3.6 V |
| WiFi Current (Peak) | 310 mA |
| Light Sleep Current | 550 uA |
| Deep Sleep Current | 20-235 uA |
| Board Size (without USB casing) | 17 mm x 50 mm |
| Board Size (with USB casing) | 19 mm x 62 mm |
| Microprocessor | ESP32-S2 Xtensa single-core 32-bit LX7 (up to 240 MHz) |
| ROM | 128 KB |
| SRAM | 320 KB |
| Flash Memory | 4 MB embedded SPI |
| WiFi Standard | 802.11 b/g/n 2.4 GHz (up to 150 Mbps) |
| Temperature Sensor Range | -20°C to 110°C |
| Product Dimensions | 10 x 10 x 10 cm |
| Item Weight | 9.07 g |
| Connectivity Technology | USB, Wi-Fi |
| Model Number | Tangxi2cwuzvs4r9 |
5. Setup
5.1 Initial Connection
The Kaktus WHID is designed for plug-and-play operation. Simply insert the device into an available USB port on your computer or target device. No additional software installation is required for basic functionality.
Figure 5.1: The Kaktus WHID device connected to a laptop's USB port, demonstrating a typical setup.
5.2 Entering Bootloader Mode
To flash custom firmware or perform advanced configurations, you may need to put the ESP32-S2 module into bootloader mode. Follow these steps:
- Insert the Kaktus WHID (WUD) into your laptop's USB port.
- Place a magnet close to the hall sensor (GPIO 0) on the device.
- Press the reset button. The WUD will now enter bootloader mode.
6. Operating Instructions
Once connected, the Kaktus WHID functions as a USB Human Interface Device. Its primary purpose is to send keystrokes to the connected computer via Wi-Fi. This allows for remote execution of commands and scripts.
To utilize its full capabilities, users typically need to develop or load custom scripts and firmware. This often involves using development environments like the Arduino IDE to program the ESP32-S2 module for specific tasks, such as keyboard assistance or automated command sequences.
7. Maintenance
To ensure the longevity and proper functioning of your Kaktus WHID, observe the following maintenance guidelines:
- USB Port Protection: The device features a metal clip around its ABS plastic body with a rubber oil coating. The casing is designed to provide effective protection for the USB port. Keep the protective cap on when not in use to prevent dust and damage.
- Handling the PCB: The device comes in anti-static packaging to protect the printed circuit board (PCB). Exercise caution when handling the PCB, especially before inserting it into the casing, to avoid electrostatic discharge.
- Cleaning: Use a dry, soft cloth to clean the exterior of the device. Avoid using liquid cleaners or solvents.
- Storage: Store the device in a cool, dry place away from direct sunlight and extreme temperatures.
8. Troubleshooting
If you encounter issues with your Kaktus WHID, consider the following troubleshooting steps:
- Device Not Recognized: If the device is not recognized by your computer, try unplugging and re-plugging it into the USB port. Ensure the USB port is functional.
- Connectivity Issues: For Wi-Fi related problems, ensure your Wi-Fi network is operational and the device is configured correctly for your network.
- Custom Firmware/Scripts: If you are using custom firmware or scripts and experience issues, verify your code for errors. Compatibility with specific Arduino IDE versions or libraries might be a factor. Refer to relevant online communities or documentation for assistance with custom development.
- Bootloader Mode Issues: If you have difficulty entering bootloader mode, ensure the magnet is correctly positioned over the hall sensor (GPIO 0) and the reset button is pressed firmly.
9. Warranty and Support
For warranty information, technical support, or service inquiries, please refer to the documentation provided at the time of purchase or contact your retailer. Keep your proof of purchase for any warranty claims.