Hello, World!
No introduction to a programming language would be complete without a "Hello, World!" example. Call it cliché, but this ubiquitous example makes for a welcoming DuckyScript initiation.
While the new DuckyScript 3.0 introduces a ton of new features, it does so by building on the simplicity of the original DuckyScript language — a language which has become synonymous with the keystroke injection attack technique it invented.
So with this one "Hello, World!" example we'll not only learn the absolute basics of the original DuckyScript language, but also the process for testing out a payload.

Key Terms

  • Keystroke Injection — a type of hotplug attack which mimics keystrokes entered by a human.
  • Hotplug Attack — an attack or automated task that takes advantage of plug-and-play.
  • Plug and Play — a peripheral standard whereby connected devices work automatically.
  • USB Rubber Ducky — the USB device that delivers hotplug attacks.
  • Payload — the specific hotplug attack instructions processed by the USB Rubber Ducky.
  • DuckyScript — both the programming language of, and source code for USB Rubber Ducky payloads. May refer to a specific payload in human-readable DuckyScript source code.
  • inject.bin — the binary equivalent of the DuckyScript source code generated by the compiler and encoder consisting of byte code to be interpreted by the USB Rubber Ducky.
  • Payload Studio — Integrated Development Environment consisting of a source code editor, compiler, encoder and debugger for programming DuckyScript.
  • Editor — the text processing element of the Payload Studio featuring syntax highlighting, autocomplete, indentation and snippets specific to the DuckyScript programming language.
  • Compiler — the element of the Payload Studio which converts the DuckyScript source code into the byte code interpreted by the USB Rubber Ducky.
  • Debugger — the element of the Payload Studio which tests the DuckyScript source to be syntactically correct. May provide warning or error messages if a programming bug is found.
  • Loot — the logs, data and other information obtained during the deployment of a payload, often consisting of details about the target (recon) or information from the target (exfiltration).
  • Arming — the act of transferring a payload to the hotplug attack device.
  • Arming Mode — a mode whereby the hotplug attack device facilitates convenient payload and loot transfer, such as acting as benign USB mass storage, network device or serial interface.
  • Target — the computing device on which the payload will be deployed.
  • Deployment — the execution of the payload on the target.

Learn Original DuckyScript In Just 4 Lines

Learn the basics of the original DuckyScript language from this one example alone.
REM My first payload
DELAY 3000
STRING Hello, World!
ENTER
As you might imagine, this payload types "Hello, World!".

Testing The Payload

With the new terms in mind, let's try out the Hello World example by following these steps:
  1. 1.
    Plug the USB Rubber Ducky into your computer. If it doesn't show up as a flash drive automatically, press the button to enter arming mode.
  2. 2.
    Copy the DuckyScript source code of the Hello World example payload.
  3. 3.
    Paste it into a blank new project from the editor in Payload Studio.
  4. 4.
    Click Generate Payload to compile the payload.
  5. 5.
    Click Download Payload to save the inject.bin file.
  6. 6.
    Copy the inject.bin file to the root of the USB Rubber Ducky drive.
  7. 7.
    Unplug the newly armed USB Rubber Ducky from your computer.
  8. 8.
    Open a text editor on the target. This may be the same computer used for arming.
  9. 9.
    Ensure that the text area is the active window, which is usually indicated by a blinking cursor.
  10. 10.
    Deploy the payload against the target by plugging it into an available USB port.
  11. 11.
    Watch as the keystroke injection payload is executed by the hotplug attack device.
Voilà — "Hello, World!"
These are the steps that will be repeated numerous times as you continue to learn and experiment with the DuckyScript language.

A Quick Breakdown

So, let's break down each line of this payload to understand the language and what it does.
Each line of an original DuckyScript file, or "payload" as they are known, is processed one at a time. A line may include a comment, a delay, or a key or set of keys to press. That's it.
  1. 1.
    REM is short for Remark and adds a comment to the payload, like a title or the author's name.
  2. 2.
    DELAY pauses the payload for a given amount of time, expressed in milliseconds.
  3. 3.
    STRING injects keystrokes, or "types", the given characters (a-z, 0-9, punctuation & specials).
  4. 4.
    ENTER is a special key which may be pressed, like TAB, ESCAPE, UPARROW or even ALT F4.
A full list of special keys is available in the keystroke injection section — but they're named as one might expect. Think: BACKSPACE, HOME, INSERT, PAGEUP, F11 and the like...

That's it! For DuckyScript 1.0 at least...

Yep. That's it. That's the entirety of the original DuckyScript language; comments, delays and keys.
Want to take it just a tiny bit further? Check out these examples for Windows and macOS.

Windows Example

REM A slightly more advanced "Hello, World!" for Windows
DELAY 3000
REM Open the Run dialog
WINDOWS r
DELAY 1000
REM Open powershell with our message
STRING powershell "echo 'Hello, World!'; pause"
ENTER

Result

  • This original Ducky Script payload will open a powershell window showing "Hello, World!".
  • It starts by opening the Windows Run dialog using the keyboard shortcut Windows Key+r.
  • Next it will type a line of powershell which will display "Hello, World!", then pause.
  • Finally, it will press ENTER to execute the powershell.

macOS Example

REM A slightly more advanced "Hello, World" for macOS
DELAY 3000
REM Open Spotlight Search
COMMAND SPACE
REM Open the text editor
STRING TextEdit
ENTER
DELAY 2000
COMMAND n
DELAY 2000
STRING echo Hello, World!

Result

  • This original Ducky Script payload will open a TextEdit window showing "Hello, World!".
  • It starts by opening the Spotlight Search using the keyboard shortcut Command+Space.
  • Next it will type "TextEdit" and press ENTER, which will open the TextEdit app.
  • Then it will press the keyboard shortcut Command+N to open a new document.
  • Finally, after a 2 second delay, it will type "Hello, World!"
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On this page
Key Terms
Learn Original DuckyScript In Just 4 Lines
Testing The Payload
A Quick Breakdown
That's it! For DuckyScript 1.0 at least...
Windows Example
macOS Example