Create an object perpendicular to another?

I’ve solved this before through a number of steps. However Rhino has many tools I’m unaware of, is there one for this?
e.g. I have a tube off axis in 3d space. Id like to attach a cube perpendicular starting from the tube end diameter center. Is there a "perpendicular to point/object/curve command?

Perhaps OrientOnSrf or OrientOnCrv? You may need to experiment with the options.