SystemExtr is the application that triggers issues with the machine

From 2-spyware.com

SystemExtr

SystemExtr – the application that runs on macOS and triggers high usage of CPU. This is the main issue why users[1] complain about the process, shady app, and wants to find answers. The program possibly is not causing any symptoms and you cannot see the infiltration of the PUP or the tool. The main thing this intruder triggers is the usage of resources and crashes with a particular error.

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