3137.mp4
If you found something in a single frame, explain how you extracted it using ffmpeg -i 3137.mp4 -vf "select=eq(n\,3137)" -vframes 1 out.png .
Briefly state what the goal was (e.g., "Find the hidden flag within the video file").
A quick summary of the trick (e.g., "The flag was hidden in the LSB of the audio channel"). 3137.mp4
Did you run exiftool 3137.mp4 ? Often, flags or hints are hidden in the "Comment" or "Artist" tags.
Did you find the flag by running strings 3137.mp4 | grep "CTF{" ? 4. Final Flag Flag: FLAGexample_flag_123 If you found something in a single frame,
Use file 3137.mp4 to confirm it is actually an MP4 and not a renamed archive or polyglot file.
net/threads/pishem-ctf-writeup-pravil-no-zachem-eto-nuzhno-i-kak-pomogayet-razvitiyu.92117/">Codeby ? Did you run exiftool 3137
This is the core of your write-up. Explain the "Aha!" moment:
