Possible hack?

pdenboer wrote:

Macbook from time to time suddenly starts an application on its own. For some background info I have included the EtreCheck report. Look forward to suggestions.

<EtreCheck report.log>

Which application starts on its own? Is there a consistent pattern here?

Have you tried To trouble shoot further:

Try a SafeBoot https://support.apple.com/en-us/HT201262

Takes noticeable longer to get to the login screen, does a 5-15 minute disk repair before it fully boots up, and certain system caches get cleared and rebuilt, including dynamic loader cache, etc.

This test will tell you if third party interference; extensions etc are not loaded in safe boot mode.

Test issue in another user (or guest user) account  https://support.apple.com/en-us/HT204443

This will tell you if it a universal issue or isolated to your user/admin account. 

I doubt it is hacked.

I think it is more like the corrupt host file, for help with that view https://discussions.apple.com/thread/8004809