CryptoLocker v2

Description

Following a recent attack (challenge CryptoLocker v1), our service provider gave us a new update, this time ensuring that it was free of any malware. However, when our administrators tried to apply it on a highly sensible server, they discovered that it was a new version of the previous malware. Our critical file has once again been encrypted… and we ask you to recover its content.

Note: This challenge has been made for the finale of FCSC 2020.