There are a kext and a MachO binary would be compiled as output. Please notice mac-a-mal.kext was tested successfully on macOS <= 10.12. I will try on 10.13 soon and let you know. Btw, it would be great if you create this separate ticket on mac-a-mal.
Grey-cuckoo builds but no executable is created. Without it every time I kextload mac-a-mal.kext the VM reboots.
Any help ?