In most CTF iterations of gt00.7z , the challenge falls into one of two categories:
Once the archive is extracted, you typically find a nested file (e.g., flag.txt or a .pcap ). cat flag.txt gt00.7z
Check the file for any trailing hidden data using binwalk -e . Conclusion In most CTF iterations of gt00
Extract the contents (often a flag or a disk image) from the archive. In most CTF iterations of gt00.7z