Somewhere in China, a man typed his user name, “ghost,” and password, “hijack,” and proceeded to rifle the computers of a utility in the Northeastern U.S. That didn’t appear to be his intention, and neither was economic espionage. While he was one of the Chinese officers the U.S. charged last month with infiltrating computers to steal corporate secrets, this raid was different. The hacker called UglyGorilla invaded the utility on what was probably a scouting mission, looking for information China could use to wage war.