Governments and major corporations worldwide are scrambling to see if they, too, were victims of a global cyberespionage campaign that penetrated multiple U.S. government agencies and involved a common software product used by thousands of organizations. Russia, the prime suspect, denies involvement. Cybersecurity investigators said the hack’s impact extends far beyond the affected U.S. agencies, which include the Treasury and Commerce departments, though they haven’t disclosed which companies or what other governments were targeted.

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