Hacking trail leads to Russia, experts say

Earlier this year, investigators for Silicon Valley security company FireEye Inc. visited a U.S. firm to determine who, and what, sneaked into the firm’s network harboring military secrets.

There they found what they call a sophisticated cyberweapon, able to evade detection and hop between computers walled off from the Internet. The spy tool was programmed on Russian-language machines and built during working hours in Moscow. FireEye’s conclusion, in a report to be released Tuesday: The cyberspying has a “government sponsor—specifically, a government based in Moscow.”