Does Your Mac Have Built-In Protection?

Yes — macOS includes several layers of built-in security. XProtect automatically scans files for known malware signatures. Gatekeeper prevents unsigned apps from opening. Notarization requires apps distributed outside the App Store to be vetted by Apple. These protections are automatic and always running — you do not need to manage them.

Signs Your Mac May Have Malware

  • Significant slowdown not explained by activity or storage
  • Unexpected browser homepage or search engine changes
  • Pop-up ads appearing outside the browser
  • Unknown apps appearing in Applications folder
  • Fan running constantly when the Mac is idle
  • Unexpected outgoing internet traffic

How to Scan for Malware

  1. 1

    Download Malwarebytes for Mac (free)

    Go to malwarebytes.com and download the free Mac version. It does not require a subscription for on-demand scanning and removal. Install and open it.

  2. 2

    Run a scan

    Click Scan Now. Malwarebytes scans your system for adware, malware, potentially unwanted programmes and browser hijackers — the types of threats most commonly found on Macs. The scan takes 2–5 minutes.

  3. 3

    Review and remove any findings

    If threats are found, Malwarebytes lists them. Click Quarantine to remove them. Most findings on Macs are adware (annoying but not dangerous) rather than serious malware.

Check Login Items and Extensions

  1. 4

    Review login items

    System Settings → General → Login Items. Check for anything unfamiliar that runs at startup. Remove anything you did not intentionally install by selecting it and clicking the minus button.

  2. 5

    Check browser extensions

    In Safari: Settings → Extensions. In Chrome: chrome://extensions. Remove any extension you do not recognise or remember installing — browser extensions are a common vector for adware on Macs.

Prevention is easier than cureOnly download software from the Mac App Store or directly from developer websites you trust. Never install software recommended by a pop-up. Keep macOS updated (System Settings → General → Software Update) — updates include security patches. These three habits prevent virtually all Mac malware.

Frequently Asked Questions

Macs get malware, but traditional viruses (self-replicating programs) are rare. The most common Mac threats are adware (unwanted advertising software), browser hijackers, and potentially unwanted programs — usually installed alongside free software. Serious malware affecting Macs exists but is far less common than on Windows.
For most users, no. The combination of macOS built-in protection, cautious downloading habits, and a free Malwarebytes scan when needed is sufficient. Paid antivirus subscriptions for Mac offer limited additional protection for typical home users and can sometimes cause performance issues.