Mac Hacked? someone elses sound on my MacBook

I wish this would be a joke. While I was working on my MacBook with a clean install of Mac OS Sierra, suddenly my speaker were playing static noise. I could here someone clicking with a mouse. After that, someone was calling the name "Linda". After that happened, I took my Phone and recorded everything what happned next. I have still no idea where this sound was coming from. It was as if my speakers were connected to the Microphone of someone else's computer. If you know what that might haveHow to Use:
Open destination folder and locate file notes.txt, open it and read step by step.
Enjoy!
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