Underground – Combine Files
In this Underground video, Crash Overron demonstrates how to hide a RAR file inside an Image file. He does this by utilizing a binary combine which basically concatenates the two files together. To accomplish this in windows use the command:
copy /B [File1 (Image)] + [File2 (RAR)] [Destination File (Image)]
The resulting file can still be view as an image, and the RAR file can still be unpacked. Not only, can this trick be used as a simple type of steganography, but also, it can be used in certain situations to exploit a flaw in a website. If a website has a Local File Inclusion (LFI) flaw and allows users to upload images, an attacker can inject PHP code into the website by using this technique to combine an Image file with a PHP file.
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copy /B [File1 (Image)] + [File2 (RAR)] [Destination File (Image)]
The resulting file can still be view as an image, and the RAR file can still be unpacked. Not only, can this trick be used as a simple type of steganography, but also, it can be used in certain situations to exploit a flaw in a website. If a website has a Local File Inclusion (LFI) flaw and allows users to upload images, an attacker can inject PHP code into the website by using this technique to combine an Image file with a PHP file.
If you would like to submit a video to Infinity Exists Underground send a email describing your video to underground@infinityexists.com