We keep hearing the terrorists are funded by ... (take a guess)

Think about who benefits from sponsoring chaos. Order out of chaos is the motto of which group? A lot of chaos resulted from the 911 atrocity - who benefitted? The media sold that to us as a terrorist attack, right? I wonder who financed that. It must have costs millions or billions in total. Who has that kind of money? What sort consider mass death a boon - even a religious ritual?