Report: Hackers planted malware on key parts of the U.S. electrical grid. Hackers most likely gained access by exploiting a bug in software such as Windows or Office, researcher says. Analyst: “Any computer connected to the Internet is potentially vulnerable” Wall Street Journal report says hackers from China, Russia and others have penetrated U.K. power grid. Researchers: “I doubt that the problem is that serious,” but even if it’s exaggerated, it behooves us all to be careful””]