3137.mp4

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

If the video looked normal, did you check the audio track? Mention if you used Audacity or Sonic Visualizer to look at the Spectrogram for hidden text. 3137.mp4

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

Briefly state what the goal was (e.g., "Find the hidden flag within the video file"). Mention if you used Audacity or Sonic Visualizer

A quick summary of the trick (e.g., "The flag was hidden in the LSB of the audio channel").

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

Did you run exiftool 3137.mp4 ? Often, flags or hints are hidden in the "Comment" or "Artist" tags.