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One of the greatest new features of the Bash Bunny Mark II is remote triggers. With this, a payload — or multiple stages of a payload — can be triggered from afar. These can be done with any bluetooth low-energy device, including most smartphones. In this article I'll demonstrate how to use this handy new feature.
Imagine a social engineering engagement where the target is asked to print a document from a flash drive. The Bash Bunny, with ATTACKMODE STORAGE, will present itself as just such a benign device in the first stage of an attack. Then the opportunity presents itself to launch a second stage — emulating a HID device and performing keystroke injection — when the target turns their back to fetch the printout.
# # Remote Trigger for Bash Bunny Mark II Example # LED SETUP # # Stage 1: Benign flash drive # ATTACKMODE STORAGE LED STAGE1 WAIT_FOR_PRESENT myphone # # Stage 2: Evil keystroke injection attack # ATTACKMODE STORAGE HID LED STAGE2 QUACK GUI r QUACK DELAY 200 QUACK STRING cmd /k tree c:\ QUACK ENTER
For this attack to proceed to the second stage, you simply need to advertise the BLE device named "myphone". This can either be the name of a BLE device that advertises whenever it's on — like a bluetooth speaker — or advertisements specifically sent from an app like BLE Tool.
Any bluetooth utility capable of broadcasting BLE advertisements will work. In testing I often times find myself using the highly configurable and aptly named BLE Tool for Android. If you choose to test with it, there are only 3 steps to follow:
The WAIT_FOR_PRESENT and WAIT_FOR_NOT_PRESENT extensions work by setting the BLE module to Observation mode (
AT+ROLE=2), then continuously saving the scanned airwaves to a temporary file on a 5 second interval (
timeout 5s cat /dev/ttyS1 > /tmp/bt_observation). That binary file is then checked for the string value specified with the extension (
grep -qao $1 /tmp/bt_observation).
If you're curious what other advertisements might be found, consider running
strings against this file while in observation mode. For faster remote triggers, consider modifying the extension for shorter scan durations.
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