3137.mp4 May 2026

Did you find the flag by running strings 3137.mp4 | grep "CTF{" ? 4. Final Flag Flag: FLAGexample_flag_123

Use file 3137.mp4 to confirm it is actually an MP4 and not a renamed archive or polyglot file.

List your toolkit, such as ExifTool , FFmpeg , StegSolve , Sonic Visualizer , or Strings . 2. Initial Analysis Describe your first steps after receiving the file: 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 .

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

net/threads/pishem-ctf-writeup-pravil-no-zachem-eto-nuzhno-i-kak-pomogayet-razvitiyu.92117/">Codeby ?

This is the core of your write-up. Explain the "Aha!" moment: List your toolkit, such as ExifTool , FFmpeg

Did you watch the video for flashing frames, QR codes, or Morse code? 3. Deep Dive & Exploitation