amrwc / derulo

Prank your friends when they leave their machine unlocked

derulo

Give your co-workers a quick information security lesson by derulo'ing them. Maybe next time they will remember to lock their machine.

What?

The script instantly changes the desktop's background of the machine it's run on.

Why?

If your workplace is friendly enough to pull off pranks and some of you care about information security, the one and only Jason Derulo will be a perfect reminder of how quickly damage can be done and that an unattended computer should be locked.

Please note that the scripts may have to be run more than once for the changes to take effect.

macOS

Tested on High Sierra, Mojave and Catalina. Admin privileges are not required. Common raster image types, such as JPG, PNG, BMP, GIF, etc. are supported.

1. Open Terminal.app

   • press cmd + space,
   • type terminal,
   • press return.

2. Run the script

   curl https://raw.githubusercontent.com/amrwc/derulo/main/mac | bash
   
   # Custom image from the web:
   curl https://raw.githubusercontent.com/amrwc/derulo/main/mac | bash -s https://html5box.com/html5gallery/images/Waves_1024.jpg
   
   # Custom image from disk:
   curl https://raw.githubusercontent.com/amrwc/derulo/main/mac | bash -s file://$HOME/Downloads/derulo.bmp
   curl https://raw.githubusercontent.com/amrwc/derulo/main/mac | bash -s file:///Users/john/Downloads/derulo.bmp

3. There may appear a permission-related pop-up, which you have to accept.

   

Windows

CMD doesn't include a curl-like program out-of-the-box, therefore this method requires more steps. The PowerShell one-liner is more succinct.

CMD + PowerShell

Tested on Windows 10. Admin privileges are not required.

This method utilises PowerShell to download the required files, but relies on the batch script to mitigate potential restrictions around .ps1 files.

In some restricted environments the PowerShell method may not work. In such case, try one of the CMD-only methods below.

1. Open CMD

   • press Win + R,
   • type cmd,
   • press return.

2. Run:

   :: Pro tip: triple-click on the line below to quickly highlight it
   powershell Invoke-RestMethod -Uri https://raw.githubusercontent.com/amrwc/derulo/main/powershell -OutFile derulo.bat && derulo.bat

CMD-only

Tested on Windows 7 and Windows 10. Admin privileges are not required.

Copy-paste

1. Download any .bmp image (example), and call it derulo.bmp.

2. Open CMD

   • press Win + R,
   • type cmd,
   • press return.

3. Run:

   :: NOTE: The script assumes that the image is in the default 'Downloads' directory.
   reg add "HKEY_CURRENT_USER\Control Panel\Desktop" /v Wallpaper /t REG_SZ /d "" /f
   reg add "HKEY_CURRENT_USER\Control Panel\Desktop" /v Wallpaper /t REG_SZ /d "C:\Users\%USERNAME%\Downloads\derulo.bmp" /f
   
   :: Runs the 'update' dll multiple times to ensure an immediate effect
   start "" /b rundll32.exe user32.dll,UpdatePerUserSystemParameters
   start "" /b rundll32.exe user32.dll,UpdatePerUserSystemParameters
   start "" /b rundll32.exe user32.dll,UpdatePerUserSystemParameters
   start "" /b rundll32.exe user32.dll,UpdatePerUserSystemParameters
   start "" /b rundll32.exe user32.dll,UpdatePerUserSystemParameters
   
   :: Clear screen
   cls

Local batch file

1. Save the cmd.bat script locally.

2. Download any .bmp image (example), and call it derulo.bmp. Make sure it's placed in the same directory as the cmd.bat script.

3. Double-click the cmd.bat script, or run it through CMD by typing the script's name after navigating to its directory.

   cd <path_to_script>
   cmd.bat

Caveats

• Windows version
  • Only supports bitmaps (.bmp images).
  • Leaves the derulo.bmp image behind (it may be possible to delete it, but not immediately after the script is finished).
  • The pure batch version doesn't support automated script/image download.

derulo's Issues

Create a GitHub Action to Periodically Validate The Image URLs

Replace Expired URLs

Create Script for Ubuntu