Cube is a German brand. Been around a while, and the e-stay style bikes have been made by many companies. Back when they were the new hot thing, a lot of bike companies were making them.

It's likely old enough that you'll just not be able to find much info on the web.

You don't see as many e-stay bikes still around - the rear ends and BB area on nearly all of them were on the flexy side, which led to many of them cracking/breaking over the years. the ones that weren't this way were because they were ridiculously overbuilt to compensate.