[b0b0b0b]

Why wasn't the DLL signed? Is this not a thing?

[Permit]

DLLs are signed. But they aren't checked every time a DLL is loaded. It absolutely obliterates load time if you have to go through every byte of all your DLLs and hash them. (You have the option to turn this on within the registry, though)

Signing is almost useless in .Net. And it's certainly not in place for security purposes.

[kevingadd]

Signing wouldn't have addressed this because they're creating a new, modified executable. So they just make that one unsigned.