Use binwalk CTESP.rar to see if there are other files embedded or hidden within the archive structure. 3. Archive Examination Open the archive (or attempt to) to see its structure:
Use unrar l CTESP.rar to list the files inside without extracting. Look for: flag.txt Hidden directories (starting with . ) CTESP.rar
If this is a challenge you are working on, here is a general forensic write-up structure and the most common steps you would take to solve a challenge involving a compressed archive. Filename: CTESP.rar Category: Forensics / Cryptography Use binwalk CTESP
Run file CTESP.rar to confirm it is indeed a RAR archive and not a renamed file (e.g., a JPEG or executable). Look for: flag
Check the extracted files for the flag format (e.g., CTF{...} or FLAG{...} ).
Check the archive icon or file name for clues. In "CTESP" (Portugal-based) challenges, the password is often related to the school, the year, or a term found in the challenge description. 5. Extraction and Flag Discovery Once the password is found or bypassed: Extract: unrar x CTESP.rar .