What part of Linux' greater immunity to malware comes from the more logical permissions, and the more free-form naming? By that, I mean that "executable" comes

What part of Linux' greater immunity to malware comes from the more logical permissions, and the more free-form naming? By that, I mean that "executable" comes from a permission, not from an "extension", and that "extensions" in Linux are really just naming conventions. I also note that every one not leveraged to the hilt into Microsoft technology acknowledges the effect of the Windows monoculture.