Run strings on the extracted files to find hidden URLs, IP addresses, or hardcoded credentials.

Use tools like Autopsy or Foremost if the archive appears to contain "deleted" or overlapping data fragments.

Some challenges use specific or obsolete compression methods to test your toolset.

In CTF scenarios involving archives like OCYG.rar, the "helpful" information you are looking for is often: Often formatted as FLAG{...} or CTF{...} .

If it's a malware mock-up, look for registry keys or scheduled tasks hidden in accompanying scripts.