List your toolkit, such as ExifTool , FFmpeg , StegSolve , Sonic Visualizer , or Strings . 2. Initial Analysis Describe your first steps after receiving the file:
This is the core of your write-up. Explain the "Aha!" moment: 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 . List your toolkit, such as ExifTool , FFmpeg
Use file 3137.mp4 to confirm it is actually an MP4 and not a renamed archive or polyglot file. List your toolkit
net/threads/pishem-ctf-writeup-pravil-no-zachem-eto-nuzhno-i-kak-pomogayet-razvitiyu.92117/">Codeby ?
A quick summary of the trick (e.g., "The flag was hidden in the LSB of the audio channel").
Did you watch the video for flashing frames, QR codes, or Morse code? 3. Deep Dive & Exploitation