The main obfuscation was the way IEC 61131-3 constructs get first compiled to C and then to assembly.
There's a lot of indirection and zero strings in the resulting code, meaning it's very difficult to actually find whatever logic you're looking for. But once you see it, it is obvious and seems like it was built like any other logic.
There's a lot of indirection and zero strings in the resulting code, meaning it's very difficult to actually find whatever logic you're looking for. But once you see it, it is obvious and seems like it was built like any other logic.