fs0ciety hint needed

HTB Content Challenges
22

@mi5hal said:
Make sure you dont make these mistakes made by me :expressionless:

  1. Dont try to crack fs0ciety.zip instead of fsociety.zip.
  2. Dont use burp to decodeā€¦use some online decoder.

i have no idea how to decrypt the zip folder.can any one give some hint?