"Senior U.S. officials learned Israel was spying on the nuclear talks in 2014, a finding first reported by The Wall Street Journal in March. Officials at the time offered few details about Israel’s tactics. Kaspersky’s findings, disclosed publicly in a report on Wednesday, shed new light on the use of a stealthy virus in the spying efforts. The revelations also could provide what may be the first concrete evidence that the nuclear negotiations were targeted and by whom. "