Depends on your perspective,they acted on behalf islamic states,although not directly supported. Their backing isn't as important as their intent. For example,North Korea supports APT groups that operate with loose connections to Pyongyang,it's rumored one of these groups(Lazarus?) Was behind the Sony hacks which were effectively a much smaller act of cyber terrorism. They attacked to terrorize Sony into changing its repease of a movie mocking their leader.
I don't think the Sony hacks register on that scale.
But hacks against a country's infrastructure would.