A destructive “Trojan Horse” malware program has penetrated the software that runs much of the nation’s critical infrastructure and is poised to cause an economic catastrophe, according to the Department of Homeland Security. National Security sources told ABC News there is evidence that the malware was inserted by hackers believed to be sponsored by the Russian government, and is a very serious threat. The hacked software is used to control complex industrial operations like oil and gas pipelines, power transmission grids, water distribution and filtration systems, wind turbines and even some nuclear plants. Shutting down or damaging any of these...