What to look for : Look for unusual comments, "Artist" tags, or GPS coordinates that might be part of a multi-part challenge.
: [e.g., Spectrogram of Audio Stream / Appended Zip File] Tools Used : ExifTool, Audacity, Binwalk. Flag : CTFtango_down_part_3_success (Example) tango part3mp4
: 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 What to look for : Look for unusual
: 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 . Audio Analysis : Open the file in Audacity
If the metadata is clean, the "secret" is likely inside the video or audio streams.
The first step is to confirm the file type and check for basic hidden data.