Originally Posted by
petrified.rabbit
It is most likely worn mounts in the front. Many shops just reuse them even when you put in new struts, so the problem does not go away. The aveo has a floating suspension, so if you jack it up there can be some movement, but you need to see where the movement comes from, and there should be limited movement. which will disappear once the weight is returned to the suspension. The creaking is most likely the sway bar, whether endlinks or the bushings needing greased.
In the rear is could be the bushings for the rear beam. But the rear has more traditional suspension, what is "sound" you hear.