Alas, there is no answer.
No one could tell the president what he most wanted to know: What was the motive of the attack? “The question kept coming back, ‘Is this plain old theft, or is Putin retaliating?’ ” one senior official said, referring to the American-led sanctions on Russia. “And the answer was: ‘We don’t know for sure.’ ”
More than three months after the first attacks were discovered, the source is still unclear.