Exodus: Ultima III for Macintosh contains copy protection and therefor can not be used in a regular disk image format.  MOOF files contain flux information associated with the image file so that the image can be used with most popular software and hardware emulators with the copy protection in tact.

There is no known krack for Ultima III for Macintosh.  You will need an AppleSauce or other flux imager to write the file back to physical media.  Otherwise, you can use MOOF images with a Floppy Emu.

https://www.bigmessowires.com/floppy-emu/