Kaspersky's technical paper on Duqu 2.0,[0] begins with: "The initial attack against Kaspersky Lab began with the targeting of an employee in one of our smaller APAC offices." It notes that the next step was compromising other machines on LAN. But they only discuss Windows, and don't even mention OSX, BSD, Linux, etc.

I'm wondering how lateral movement to non-Windows machines would have been accomplished.

[0] https://securelist.com/files/2015/06/The_Mystery_of_Duqu_2_0...