It was a crypto currency trail that led intelligence agencies to upper division clerk Vikas Yadav in Nau Sena Bhavan, the naval wing of the Defence Ministry. Mr Yadav was addicted to online gaming, sources said. A Pakistani woman identified as 'Priya Sharma' - clearly a fake name - befriended him on Facebook three years ago after seeing his addiction, and persuaded him into spying for Pakistan. Thereafter, she became her handler.