SecureMac, Inc.

Malware Library. Threats targeting Macs.

Mac malware exists in all shapes and sizes and new digital parasites evolve every day. Whether it’s adware, trojan horses, keystroke loggers, viruses or other spyware, stay up-to-date and discover more information about the latest threats targeting your Mac here.


    • Type:
    • Adware
    • Platform:
    • Mac OS X
    • Last updated:
    • 07/02/20 1:52 am
    • Threat Level:
    • High


Shlayer is adware. First discovered in 2018, Shlayer has quickly become one of the most prolific families of macOS malware; some researchers estimate that the Shlayer malware family as a whole infects as many as 1 in 10 Macs worldwide.

Shlayer makes its way onto Macs via Trojanized updates and app installer files. In at least one instance, a version of Shlayer disguised an Adobe Flash update actually made it through Apple’s App Notarization process, meaning that it was not detected as malware by Gatekeeper. Once it has infected a system, Shlayer malware downloads additional malicious components, typically adware. Since Shlayer is more of a delivery mechanism than anything else, it can be used to infect Macs with many different kinds of adware.

macOS adware is often regarded as little more than an annoyance, but security researchers caution that adware infections should be taken seriously, since they can open the door to scams, fraudulent offers, data theft, and loss of privacy.

Shlayer Threat Removal

MacScan can detect and remove Shlayer Adware from your system, as well as provide protection against other security and privacy threats. A 30-day trial is available to scan your system for this threat.

Download MacScan

Join our mailing list for the latest security news and deals