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In an SEC filing detailing its financial results for the last quarter of 2023, the company said the attack was discovered during the weekend of September 23, 2023. The incident involved unauthorized access to its systems, data exfiltration, and the deployment of file-encrypting malware.
When the company disclosed the incident in late September, it was reported that a hacker group calling itself Dark Angels was behind the attack, with the hackers claiming to have stolen 27Tb of data from Johnson Controls.
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