Using Binwalk

Binwalk is a built-in Python tool that is used to analyze, reverse-engineer, and extract firmware images. A lot of people who play CTFs use this tool to analyze the files they find. In this recipe, we will look at a very basic usage of binwalk.

How to do it...

Let's perform the following steps:

1. We have an image file called brain.jpg, which opens like an image, as shown in the following screenshot:

2. Now, let's analyze it with binwalk. Use the following command:

binwalk brain.jpg

Once we run the preceding command, we get the following output:

3. We can see that this isn't an ordinary image: it contains a ZIP archive, which has a file called flag.txt. Let's extract the files from the image...