In most CTF scenarios, the ZIP file is password-protected. You can use John the Ripper or Hashcat to crack it:
Once you have the password, unzip the file. You will likely find a script (e.g., Python or Bash) or a binary that generates "True Tones" (audio frequencies). TrueToneMakerzip
Perform a basic file analysis using tools like file or binwalk in a Linux environment. This confirms if it is a standard ZIP archive or if other files have been appended to it. In most CTF scenarios, the ZIP file is password-protected
If you downloaded this file from an unverified source outside of a CTF platform, on your primary machine. Use a virtual machine or a sandbox, as ".zip" files in the wild can frequently contain malware disguised as tools. In most CTF scenarios