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SSH Host Keys changed after reboot

br flag

I noticed something strange on one of our (customers) ESXi (6.7.0). The SSH host keys suddenly changed after a reboot. Not only that, it got created with too open file permissions so nobody could connect. In the logs i found (obviously):

WARNING: UNPROTECTED PRIVATE KEY FILE!

I fixed the permissions, but it still looks strange to me. Background is, there was a ransomware attack previously at the company where the machine is located.

My question is now, is this known behavior or is there something weird going on on the hypervisor?

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