CNN —
Russian state-backed hackers gained access to some of Microsoft’s core software systems in a hack first disclosed in January, the company said Friday, revealing a more extensive and serious intrusion into Microsoft’s systems than previously known.
Microsoft believes that the hackers have in recent weeks used information stolen from Microsoft’s corporate email systems to access “some of the company’s source code repositories and internal systems,” the tech firm said in a filing with the US Securities and Exchange Commission.
Source code is coveted by corporations — and spies trying to breach them —
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