I'm not sure exactly how much hashing a cloud server could manage, but I do doubt it was worth the effort of trying in the first place. More likely this was a hacker challenge to prove the concept rather then for real gain. It does make you wonder though if hackers will deliberately target bitcoin mining in general - hacking into other people's mining equipment and changing the pool and workers to the hackers could be very profitable - especially if it takes the owner of the equipment some time to notice!