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said it became aware of an “instance where this vulnerability was exploited in the wild.” On January 11, 2023—more than six weeks after the vulnerability was fixed—Fortinet warned a threat actor was exploiting it to infect government and government-related organizations with advanced custom-made malware.
Enter CoatHanger
The Netherlands officials first reported in February that Chinese state hackers had exploited CVE-2022-42475 to install an advanced and stealthy backdoor tracked as CoatHanger on Fortigate appliances inside the Dutch Ministry of Defence. Once installed, the never-before-seen malware, specifically designed for the underlying FortiOS operating system, was able to permanently reside on devices even when rebooted or receiving a firmware update. CoatHanger could also escape traditional detection measures, the officials warned. The damage resulting from the breach was limited, however, because infections were contained inside a segment reserved for non-classified uses.
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