write-ups-challenges-2019-2020/Shrek-is-back/README.md

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2022-11-24 21:43:03 +00:00
# CHALLENGE Shrek is back
A forensics-type CTF challenge
## Description
I want Mike Myers to put his signature on this beautiful peace of art, but I can't seem to open it...
Apperently there also is a flag in this _image_.
## Flag
`IG{GeT_ShReKeD}`
## Given files
* script.jpg
The file is corrupted, by extend gitlab doesn't want to upload it as `.jpg`.
## How the challenge works
The image is actually a docx-file. The file signature has been replaced by X's, because of this it won't open in any way (invalid hex file). The most conventional way to solve is as following:
1. remove `X`'s from the file
2. apply `strings` (now you see it is a docx-file)
3. find file signature online: `50 4B 03 04 14 00 06 00`
4. set file signature, open in Word/Writer
5. flag is in image on last page of the file