https://bugs.winehq.org/show_bug.cgi?id=48499
--- Comment #4 from Vincent Povirk madewokherd@gmail.com --- Seems to be .NET Reactor.
Found this trying to figure out what obfuscator was used: https://github.com/0xd4d/de4dot
That could be a useful tool for identifying obfuscators in the future.