The Japan Aerospace Exploration Agency ( JAXA ) has reported a possible data breach on its first Epsilon solid - fueled rocket , Kyodo news agency says . Spyware was found on one of the agency ’s personal computers on November 21 . It was immediately disconnected from the local area network . Experts are now probing into the origins of the virus , which could be a stray one or planted as a result of a hacker attack on JAXA . Among the leaked data JAXA cited the rocket ’s parameters , specifics of its engine maintenance and protocols on agency ’s meetings . Japan started developing the next - generation solid propellant rocket , called Epsilon , two years ago . It is superior to the existing H - IIA rocket due to its smaller size , which will allow it to lift light satellites into orbit at a quarter of the H - IIA launch cost . ;