Microsoft investigating security groups for leaks to hackers – Financial Times

Microsoft is investigating whether security companies that it works with leaked details about vulnerabilities in its software, helping hackers to expand a huge cyber attack at the end of last month, according to people briefed on the inquiry.
Microsoft originally blamed Hafnium, a Chinese state-backed hacking group, for the first spate of attacks in January.
Just as the company prepared to announce the hack and provide fixes, however, the attacks — which targeted “specific individuals” at US think…

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