Ulli Weichert/ November 18, 2021/ IT-Security, Write-Ups/ 0Kommentare

Noise

Messi: 'When the year starts, the objective is to win with all the team, personal records are secondary'

Todos

Given was this picture:

In this stego challenges the first approach is to check the file type and look for some strings.

$ ~ # file challenge.png
challenge.png: PNG image data, 926 x 1262, 8-bit grayscale, non-interlaced

That looks normal... okay strings then. For a better overview I like to write the output to a file.

$ ~ # strings challenge.png > challenge.png_strings

But in this file, we also find nothing. Okay my secret weapon then... I found this tool over a youtube video. stegosolve is a java tool, which brings some nice features.

java -jar stegsolve.jar

I load the image an checked all layers and channels. But still nothing... okay then lets have a look in the offset! For this you need to use the option "Analyse > Stegogram Solver".

Look at offset 84.

Come a littlebit closer 😉

There it is!

flag {M3ss1rrvvv333!}