The Yomiuri Shimbun has reported that Japan has been building a multi million dollar virus that battles of cyber attacks since 2008. The Defense Ministry's Technical Research and Development Institute, which is in charge of weapons development, outsourced the project's development to a private company. Fujitsu Ltd. won the contract to develop the virus, as well as a system to monitor and analyze cyber-attacks for 178.5 million yen. So ultimately they have been testing this in closed networks for 3 years, its chewed up a few million dollars and the end result is according to the sources, the program can identify the source of a cyber-attack to a high degree of accuracy for distributed denial of service (DDoS) attacks, as well as some attacks aimed at stealing information stored in target computers such as the large scale phishing attacks that we have seen. It would also appear that Fujitsu have been contacted and denied to give comments due to client confidentiality, but as we have seen in the past Fujitsu its self has been a target to many attacks over the years. Source