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Depending on the specific challenge version, the "hook" is usually one of the following:

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

The first step is identifying the file type and checking for basic obfuscation.

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

The archive is protected by a password that can be found via a wordlist (like rockyou.txt ).

Crack the hash: john --wordlist=/usr/share/wordlists/rockyou.txt bwas.hash

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