For this write-up i will use binwalk and stegsolve, but you can use orther tools.
Download the image for the challenge provided Binwalk.png.
Then use binwalk to see if there are something hiding there, like this:
``` binwalk Binwalk.png ```
With this you can see that there is a png file hidden in the image, extract it with binwalk, you can don it with this command (if you had binwalk installed):
``` binwalk Binwalk.png --dd='.*' ```
In the extracted directory, notice a white image, without the extension. Change it's name to '208CBC' to '208CBC.png'.
Then open stegsolve, open the image '208CBC.png' in stegsolve go to 'Gray Bits' plan with the arrows. And then you see the flag.
Look close to the flag, so you can distinguish 'I' upercase from 'l' lowercase.