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red herrings.txt

YCEP 2024

Forensics easy

the fishes in the sea are plentiful! so many red herrings! Don't fall for the obvious tricks - the flag is much more well hidden

solution

  1. We are provided with a zip file, redherring.zip. unzipping the file uncovers what appears a bunch of fishy images and videos.

  2. There are a bunch of fake flags, so before going through each one of them, ill go through the solution first

REAL FLAG!!!!!

  • If you open red_herring3.jpeg in notepad or cat it you will see the flag format at the end of the file

FAKE FLAG #1

  • in red_herring_video1, at around 3 seconds, there is what seems to be weird noises. Opening the audio in audacity reviews a message, but not the flag :c

  • It tells us that there are no flags and a hint to check the images more throughly.

FAKE FLAG #2

  • In red_herring2.jpeg, if you look under the property tab, you will see another fake flag :3

FAKE FLAG #3

  • In red_herring4.png, if you look at the actual image, you can see that theres a flag format hidden in the bottom left corner. Fake though hehe

FAKE FLAG #4

  • In red_herring6.png, the image is pretty messy, but there seems to be a flag format in the middle of the screen. hmm i wonder if that flag is real?

Flag: YCEP24{sl3pt_w1th_th3_f1sh35}

View challenge source on GitHub