If you are getting notifications from AuroraShack, then your Mac is infected with adware. AuroraShack is adware for Mac.
AuroraShack changes setting in your Mac. First, AuroraShack installs a browser extension in your browser. Then, after AuroraShack hijacks your browser, it modifies settings in the browser. For example, it changes the default home page, modifies search results, and displays unwanted pop-ups in your browser.