More Hacking Attacks Found as Officials Warn of ‘Grave Risk’ to U.S. Government

WASHINGTON — Federal officials issued an urgent warning on Thursday that hackers, who American intelligence agencies believed were working for the Kremlin, used a far wider variety of tools than previously known to penetrate government systems, calling the cyberoffensive “a grave risk to the federal government.”

The discovery suggests that the hacking, which now appears to have extended to the Energy Department agency that designs nuclear weapons and the federal agency that protects the nation’s power grid, vastly complicates the challenge for federal investigators as they search through computer networks trying to assess the damage and understand the scope of what had been stolen. A central question is whether the access could go beyond espionage, to destructive attacks.

Although the government warning made no specific reference to the origin of the hacking, intelligence agencies have told Congress that they believe it was carried out by the S.V.R., an elite Russian…

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