I don't know what it is but would like to share my personal thought about it.
I think you should eliminate it. From your pictures, combined with my bad eyesight, it looks like it's attached or is attaching itself to the wall. That could spell trouble. Many vines/climbers will get their roots so firmly attached, especially to brick, that they will eventually do some damage and be hard to control.
But on the other hand, you might have a friendly climbing plant.