: If the file was suspected to be a JPEG hidden inside the MP4, or if there's an embedded image.
: Check if other files (like a .zip or .txt ) are appended to the end of the video using binwalk -e tango_part3.mp4 . 3. Media Stream Analysis tango part3mp4
Metadata can often hide clues about the tool used to create the file or direct "leaks" of the flag. : Run exiftool tango_part3.mp4 . : If the file was suspected to be
: Watch the video at slow speeds. Sometimes flags are hidden in a single frame (a "subliminal" flash) or written in the background. Audio Analysis : Open the file in Audacity . Media Stream Analysis Metadata can often hide clues
: Use the strings command (e.g., strings tango_part3.mp4 | grep -i "CTF" ) to look for plaintext flags or URLs embedded in the binary data. 2. Metadata Examination
What to look for : Look for unusual comments, "Artist" tags, or GPS coordinates that might be part of a multi-part challenge.
: Use ffmpeg -i tango_part3.mp4 -vf "negate" output.mp4 to invert colors or extract every frame to a folder for automated scanning: ffmpeg -i tango_part3.mp4 thumb%04d.jpg -hide_banner Summary of Findings