I thought of that immediately too. But who knows if that have that level of sophistication. We know Al Qaeda does. But who's to say at this point.
If they blew it up - you would think there would be a visible debris field.
If they overtook the planes controls, you'd think there would have been some sort of communication before/during/after the incursion.
Tis a puzzlement how it went off the radar and left no trace other than an oil slick. Sounds like it went headfirst into the ocean - without ever making a communication to the ground.