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Tech giant Microsoft has revealed that Russian state-backed hackers gained access to some of its core software systems in a hack first disclosed in January.
Microsoft made this known on Friday, revealing a more extensive and serious intrusion into its systems than previously known.
According to CNN, the company 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 United States Securities and Exchange Commission.
Source code is coveted by corporations — and spies trying to breach them — because it is the secret nuts and bolts of a software program that make it function.
Hackers with access to source code can use it for follow-on attacks on other systems.
Microsoft first revealed the breach in January, days before another Big Tech company, Hewlett Packard Enterprise, said the same hackers had breached its cloud-based email systems.
The full extent and exact purpose of the hacking activity isn’t clear, but experts say the group responsible has a history of wide-ranging intelligence gathering campaigns in support of the Kremlin.
The hacking group was behind the infamous breach of several US agency email systems using software made by US contractor SolarWinds, which was revealed in 2020.
The hackers had access for months to the unclassified email accounts at the departments of Homeland Security and Justice, among other agencies, before the spying operation was discovered.
US officials have attributed the hacking group to Russia’s foreign intelligence service. Russia denied involvement in the operation.
“To date we have found no evidence that Microsoft-hosted customer-facing systems have been compromised,” Microsoft said