We start again with the file unzipping with the standard Hack the Box challenge password. Inside, we find another ZIP appropriately named fsociety. It asks for another password when we try to open it. So, let's run it through fcrackzip with our favorite 'rockyou.txt' wordlist.
Step one done. Unzip fsociety.zip with the password 'justdoit' and open the sshcreds_datacenter.txt, which has:
That looks like Base64. We can decode it either through CLI or at https://www.base64decode.org/ Decoding it provides this output:
Obviously, this is binary. Decoding it at the below URL provides the flag.