Gatekeeping

Writeup by: USERNAME

Team: OnlyFeet

Writeup URL: GitHub

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My previous flag file got encrypted by some dumb ransomware. They didn't even tell me how to pay them, so I'm totally out of luck. All I have is the site that is supposed to decrypt my files (but obviously that doesn't work either).

Author: itszn, Ret2 Systems

http://web.chal.csaw.io:5004

Initial Research

Word.

$ echo 'thingz'
thingz

Version Mismatches

Wordsz.

some output

Ancient History or Stegosarus Time

Moar Words

$ cat commands.txt
commands1
$ nmap 1.2.3.4
...

Victory

Submit the flag and claim the points:

flag{flag-goes-here}