It looks like a bitcoin miner was included in the installer, and the admins on 1337x may or may not give a shit apparently. Scanned my pc and my wifes and found the same stuff the others mentioned.
According to the other comments, don't feel the need to uninstall as the miner was installed separate to the game, just give a Malwarebytes scan to get rid of the junk.
It's even worse apparently. Apparently someone looked at where the coins are going, and the coins are going to the 1337x admins, and the uploader is just getting a cut of those coins. Which explains why the admins are unlikely to really care because they're profiting off their users.
I have severe trust issues with any kind of pirated software so I basically never download it as a result, and shit like this is why. Even private trackers and "trusted" groups aren't enough for me to download most software.
You can follow the wallet address , but unles you know who the address belongs to, you can't follow it. So we ask again, where the proof that the coins went to site admins?