I am pretty sure it has attacked the servers command and control and infected it with asymmetric encryption. You would need an encryption key to get through the mess it just created.

Unless you know where and how you have been compromised system restore boots might work but if they did it once and you don’t know how they did it they can do it again and most likely will.

Even if you are lucky and get in, posting posts inside an infected forum which nobody else can log into would be somewhat futile. You would need to let the admins know here by posting in this Outpost Forum or one of their choosing..