# Full WriteUp
Full Writeup on our website: [http://www.aperikube.fr/docs/tjctf_2018/gridparser](http://www.aperikube.fr/docs/tjctf_2018/gridparser)
-------------# TL;DR
In this task the author gaves us an Excel file. As all Office file, it’s possible to unzip them. With a quick look, we notice a PNG file in decompressed data.
This PNG is not displayed in the Excel file. Then, *binwalk* extract a little encrypted zip from the PNG file.
Finally, I used *fcrackzip* to bruteforce the password (secret key = *px*).