Keeping Malware off Apple Computers: A Practical Guide

Do Macs actually get malware?

Yes. The idea that Apple computers are immune to malware is outdated. Mac-specific malware exists and has grown considerably in recent years. Most of what infects Macs falls into the categories of Trojans, adware, and spyware — software that users are tricked into installing rather than code that self-replicates like traditional viruses. But the effect on your system can be just as damaging. The good news is that keeping a Mac malware-free is straightforward if you follow a few consistent practices.

Install reputable antivirus software

macOS includes built-in security tools — XProtect catches known malware automatically, Gatekeeper blocks unauthorized apps, and Notarisation checks third-party software before it runs. These provide a solid baseline. For higher-risk users — those who handle sensitive business data, download software from outside the App Store, or share files frequently with Windows machines — third-party tools like Malwarebytes for Mac or Intego Mac Internet Security add a meaningful additional layer.

When choosing antivirus software, look for one that updates its malware definitions automatically, offers real-time scanning, and has 24/7 support. Malware does not operate on a 9-to-5 schedule, and having access to support outside business hours matters when something goes wrong.

Keep macOS and apps updated

Many macOS updates contain security patches that close known vulnerabilities. Letting updates pile up leaves your system exposed to threats that Apple has already patched. Enable automatic updates by going to System Settings > General > Software Update and turning on Automatic Updates. This applies to third-party apps too. Outdated browsers and plugins are a common attack vector on Macs.

Adobe Flash is the most notable historical example: its security flaws were exploited repeatedly on both Mac and Windows. Flash is now officially end-of-life and should be completely removed from any Mac that still has it installed.

Only download software from trusted sources

The majority of Mac malware infections start with a user downloading and installing something. Only download applications from the Mac App Store or directly from developers’ official websites. Never install software prompted by a pop-up window, and do not click download links in emails from unknown senders or social media posts.

When visiting a site to download software, check that the URL uses HTTPS and that Safari or your browser shows a valid security certificate. Safari will display a warning when a site’s certificate is missing or invalid — do not bypass these warnings. According to Apple’s own guidance, downloading only from known, verified sources is one of the most effective ways to keep malware off a Mac.

Enable the macOS firewall

The macOS firewall is turned off by default. Enable it by going to System Settings > Network > Firewall and toggling it on. The firewall controls which applications can accept incoming network connections, reducing the attack surface for malware trying to communicate over the network.

Use strong passwords and two-factor authentication

Credential theft is a common goal for Mac-targeted malware. Use iCloud Keychain or a reputable password manager to generate and store unique passwords for each account. Enable two-factor authentication on your Apple ID and on any service that supports it. If a malware attack does succeed in capturing a password, 2FA can still prevent unauthorized account access.

Signs your Mac may be infected

Watch for these warning signs that something may be running without your knowledge:

• Unexpected slowdowns: Open Activity Monitor and look for unfamiliar processes consuming high CPU or memory.
• Persistent pop-ups: Continuous ads appearing even when no browser is open.
• Browser changes: Your homepage or default search engine changes without your input.
• Overheating while idle: A Mac running hot when not in use may indicate background cryptomining software.
• Unknown login items: Check System Settings > General > Login Items for apps you do not recognize starting automatically.

FAQs about keeping Macs free of malware

Does macOS have built-in antivirus protection?

Yes. macOS includes XProtect, which automatically detects and blocks known malware; Gatekeeper, which enforces that only apps from approved sources can be installed; and Notarisation, which verifies third-party apps for malicious code before they run. These tools are effective against known threats, but they do not replace careful downloading habits or real-time scanning from dedicated antivirus software.

Do I need third-party antivirus on a Mac in 2026?

For average users who stick to the App Store and safe browsing habits, macOS’s built-in tools are often sufficient. For users who regularly download software from outside the App Store, handle sensitive business files, or share files with Windows machines, tools like Malwarebytes or Intego provide meaningful additional protection and are worth installing.

What is the most common way Macs get infected?

User-initiated installation is the most common route. Trojans disguised as legitimate software, fake system alerts prompting users to install a “required update”, and malicious email attachments are the leading delivery methods. Mac malware rarely self-propagates — it relies on user action to get installed.

How do I remove malware from my Mac?

Start by running a scan with Malwarebytes for Mac, which has a free version that detects and removes common threats. Then check Login Items in System Settings > General > Login Items and remove anything unfamiliar. Also review installed browser extensions and uninstall any you did not add yourself. If problems persist, contact Apple Support or an Apple-certified technician.

Is public Wi-Fi dangerous for Mac users?

Yes. Public Wi-Fi networks are unencrypted, which makes it possible for attackers on the same network to intercept your traffic. Using a VPN when connecting to public Wi-Fi encrypts your connection and prevents this. Avoid accessing banking, email, or work systems on public Wi-Fi without a VPN active.