Bash Bunny

Key Capabilities 

1. Multi-Identity Emulation: Unlike an ordinary thumb drive, the Bash Bunny can trick a computer into believing it is several devices at once:

• • A Super-Fast Keyboard (HID): It can type out commands at hundreds of words per minute without making human typing mistakes.

  • A Virtual Network Card (USB Ethernet): It can pretend to be a high-speed wired network connection to intercept or redirect network traffic.

  • A Flash Storage Drive: It can supply testing scripts or save captured configuration files directly to internal storage or a MicroSD card.

  • A Serial Diagnostic Port: Allows administrators and security testers to log directly into the Bash Bunny's built-in Linux system.

2. Flip-of-a-Switch Operation: A 3-position physical switch lets you carry two separate attack or audit tests at once, plus a safe setup mode.

3. Smart Visual Feedback (RGB LED): A multi-color LED on the top of the device communicates its status (such as when it is booting, actively running a test, or safe to unplug).

4. Wireless Geofencing & Remote Triggering: The Mark II version includes a Bluetooth Low Energy (BLE) sensor. This allows payloads to stay paused until an authorized phone or beacon is detected nearby, preventing tests from running in the wrong location.

Best Uses & Scenarios

1. Clean-Desk & Unlocked Workstation Audits:

   • Demonstrates what can happen if staff leave their computers unlocked when stepping away from their desks. A Bash Bunny can inject a harmless visual alert (like a pop-up window) in under five seconds.

2. Endpoint Defense Validation:

   • Used by system administrators to test whether Endpoint Detection and Response (EDR) software or Antivirus triggers alerts when automated PowerShell commands or strange USB peripherals appear.

3. USB Port Lockdown Testing:

   • Validates whether Group Policies or device control software successfully block unauthorized USB mass storage devices or unknown Human Interface Devices (HIDs).

4. Security Awareness Training:

   • Provides non-technical staff with an eye-opening, visual demonstration of the "Rubber Ducky" style physical attack vector, emphasizing why plugging in untrusted USB drives found in parking lots or lobbies is dangerous.

Key Defensive Mitigations

Defending against physical USB attacks requires a layered approach:

1. Automatic Screen Locking: Enforce an automatic lock screen timeout (e.g., 3 to 5 minutes of inactivity) and train employees to lock workstations (Win + L on Windows or Cmd + Ctrl + Q on Mac) whenever stepping away.

2. USB Device Control & Allowlisting: Use endpoint management software or Group Policy to block unauthorized USB storage devices and restrict USB device IDs (VID/PID) to approved corporate models.

3. Restricting Scripting Environments: Enable PowerShell Constrained Language Mode and enforce Application Whitelisting (such as AppLocker or Windows Defender Application Control) so unknown scripts cannot launch from the Run dialog.

4. Behavioral Endpoint Monitoring: Configure EDR solutions to monitor for rapid, non-human typing speeds and sequential command prompts launching immediately after a new USB peripheral is plugged in.

5. Physical Security: Secure sensitive offices, server closets, and reception desks to prevent unauthorized visitors from physically reaching computer USB ports.

Helpful links:

Bash Bunny Product Page
Bash Bunny Documentation page
Hak5 Youtube channel