Adware.Shlayer is Malwarebytes’ detection name for a family of adware bundlers that target macOS systems.
Adware.Shlayer, like most adware, is software that displays unwanted advertising on your computer device.
Adware.Shlayer use shell scripts to install their adware payload. And they do this only once per installer, probably to hinder analysis. Even when run on a different machine an installer that has already been run will not drop the payload again.
Adware.Shlayer are typically distributed in the form of fake Adobe Flash Player installers.
Malwarebytes for Mac detects and removes Adware.Shlayer.
Malwarebytes for Mac will detect and remove the components of this malware.