BOSTON—Russia accounted for most state-sponsored hacking detected by Microsoft over the past year, with a 58 percent share, mostly targeting government agencies and think tanks in the United States, followed by Ukraine, Britain, and European NATO members, the company said.
The devastating effectiveness of the long-undetected SolarWinds hack—it mainly breached information technology businesses including Microsoft—also boosted Russian state-backed hackers’ success rate to 32 percent in the year ending June 30, compared with 21 percent in the preceding 12 months.
