Running file gt00.7z confirms it is a 7-zip archive data.
Check the file for any trailing hidden data using binwalk -e . Conclusion gt00.7z
In most CTF iterations of gt00.7z , the challenge falls into one of two categories: Running file gt00
Open the file in a hex editor (like HxD or Ghex ). Ensure the header starts with the standard 7z signature: 37 7A BC AF 27 1C 00 03 gt00.7z
The magic bytes for 7-Zip ( 37 7A BC AF 27 1C ) might be altered to prevent tools from recognizing it. 3. Exploitation / Extraction Option A: Brute Force (If Password Protected)
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