It certainly is in this case...most people would avoid it even if it wasn't malware....Although Mac users tend to scoff at Trojans, believing them to be easy to avoid, this is not always the case.
Probably zero trouble, since it's unlikely the source code has anything that's concerned with endianness. You should understand that mostly you program for OS APIs, not a CPU architecture.So I've talked to people about this in the past, but I wonder how much of an issue this malware would be if PowerPC was still around. I wonder how much trouble it would have been to port to a RISC architecture.
--Eric