Bwas.7z

Open files in hexedit to look for the "CTF{...}" string.

Files might be hidden in Alternate Data Streams (ADS) if the archive was sourced from a Windows environment. BWAS.7z

The archive is protected by a password that can be found via a wordlist (like rockyou.txt ). Open files in hexedit to look for the "CTF{

If the archive contains system logs, search for "BWAS" (often standing for "Broken Web Application Security" or similar) to find traces of user activity. Conclusion BWAS.7z

The 7z signature ( 37 7A BC AF 27 1C ) might be slightly altered to prevent standard extraction tools from recognizing it.