If the text file contains a URL or a path to a .wav file, the tones likely represent a sequence of numbers or letters. 3. Spectrogram Analysis If the challenge involves a related audio file: Open the file in Audacity . Switch to Spectrogram view . The flag might be visually written in the frequencies. Common Flag Format
Look for strings ending in = or containing a mix of alphanumeric characters. Thunder Code_AWeBo1jDnUZZkHg.txt
Sometimes the capitalization of letters in the file name or content provides a keyword (e.g., "DTMF"). 2. DTMF/Audio Clues If the text file contains a URL or a path to a
In the CTF, challenges often involve hidden data within files or network traffic. Category: Usually Misc or Networking . Thunder Code_AWeBo1jDnUZZkHg.txt