Update 2022-09-15: This tool can be potentially used together with losetup + kpartx (see losetup). Which is a tool that makes loopback devices out of ISOs or volume files (luns, block device files, etc). Here is my article on it. First you find the magic headers for potential disk/volumes/partitions. Then you use losetup to cut out a loopback device that ignored everything before that, then use fdisk/sgdisk to analyze partitions and if found you can then consider that as your lun file for that article to cut out partitions etc into other loopback devices.

Update 2022-03-07: I wrote this article back in 2014 and have been trying to find it ever since. Just couldn’t get the search terms right. In my youthful days, I noobly called it a “firmware analyzer” when in reality it is so much more. My interpretation of if it, is its like the linux “file” command except it runs it at every byte of the file so that you can find if there is a tar, png, or whatever file deep inside of a file.

What binwalk is per kali:

https://www.kali.org/tools/binwalk

Binwalk is a tool for searching a given binary image for embedded files and executable code. Specifically, it is designed for identifying files and code embedded inside of firmware images. Binwalk uses the libmagic library, so it is compatible with magic signatures created for the Unix file utility.

My old article:

cd ~/programs

wget https://binwalk.googlecode.com/files/binwalk-1.2.1.tar.gz    (note get latest @ https://code.google.com/p/binwalk/ -> download link)