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Add USB-DriveBy #39

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82824c2
Add USB-DriveBy
90N45-d3v Nov 9, 2023
c3465e6
Improve README instructions
90N45-d3v Nov 9, 2023
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23 changes: 23 additions & 0 deletions payloads/general/USB-DriveBy/README.md
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# USB-DriveBy
* Category: General
* Author: 90N45
* Version: 1.0

### Description
Use an USB storage device to deploy payloads on-demand while the Packet Squirrel is already set up and running.

### Setup
1. Start your Packet Squirrel with the USB-DriveBy payload.
2. Whenever you want to start any payload on-demand, place the payload file with the name `payload.txt` on any compatible USB storage device.
3. When the LED lights up solid green, you can insert the USB storage into the Squirrel’s USB-A port whenever a new payload is needed.
4. You can unplug your USB storage device at the moment your payload starts

### Tip: Add an LED indicator to your payloads to indicate that your payloads have finished.
When your payload is finished, the USB-DriveBy payload will wait 10 seconds until it executes the script on your USB storage device again (if it is still present). This means that you should know when your payloads have finished and your USB storage device should be unplugged at the latest.

### Status
| LED | State |
| --- | --- |
| Magenta solid (SETUP) | Default network mode will be established |
| Green 1000ms VERYFAST blink followed by SOLID (FINISH) | Listening for USB storage device. Ready to run scripts. |
| Red slow symmetric blinking (FAIL) | No payload file found on USB storage device |
35 changes: 35 additions & 0 deletions payloads/general/USB-DriveBy/payload.txt
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#!/bin/bash

# Title: USB-DriveBy
# Description: Use an USB storage device to deploy payloads on-demand
# Author: 90N45
# Version: 1.0
# Category: General

# Choose your preferred default network mode
NETWORK_MODE="TRANSPARENT"

LED SETUP

NETMODE ${NETWORK_MODE}

LED FINISH

while true; do
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Using this loop, the payload a appears to be repeatedly triggered. I would add a flag to make sure it only runs once.

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It's intentional... since no flag is used, you can run multiple “drive-by” payloads from the USB without having to restart the main payload on the squirrel after every single use.
The delay in line 26 provides the user enough time to unplug the USB when the “drive-by” payload finished, so that it is not unintentionally triggered again.

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Please add LED indication that the payload is running so the user knows when to unplug the USB. In its current state it would be difficult to know when the payload has been transferred and is running. I would also recommend using a variable for the payload name to make user configuration easier, just in case someone wants to use something other than payload.txt.

# Check for available USB storage
USB_STORAGE && {
# Check for available payload
if [ -f "/usb/payload.txt" ]; then
# Run payload from USB storage
bash /usb/payload.txt
# Sleep to prevent triggering the payload twice unintended
sleep 10
else
# LED FAIL if file is not on USB storage
LED FAIL
fi
} || {
# Make sure to restore LED color if USB storage is detached after LED FAIL
LED G
}
done