Macs get malware. Less of it than Windows PCs, and different kinds, but adware, browser hijackers, and password-stealing programs are written specifically for macOS and catch real people every day. The old line that Macs do not get viruses was always more marketing than fact.
At the same time, Apple builds serious protection into every Mac. For a careful person who installs apps from the App Store, keeps the system updated, and does not click through security warnings, that built-in layer covers a great deal. It also has real gaps, and certain habits walk straight through them.
The useful question is whether the protection already on your Mac matches the way you use it. This guide lays out what macOS blocks on its own, what slips past it, and an honest test for whether you need anything more.
What your Mac already does to protect you
Every Mac ships with several layers of security that need no setup and no subscription.
- Gatekeeper checks apps for a valid developer signature when you open them and blocks software from unidentified developers by default. You can see this under System Settings, then Privacy & Security, in the section that controls where apps are allowed to come from.
- Notarization means apps distributed outside the App Store are expected to pass Apple's automated malware check first. Apps that skip it trigger a warning when opened.
- XProtect is a built-in scanner that compares apps against Apple's list of known Mac malware the moment they launch. Apple updates that list quietly in the background.
- XProtect Remediator goes a step further and runs periodic background scans, removing known infections it finds without asking you to do anything.
- System Integrity Protection stops any program, including malware, from rewriting core system files even if it does get onto the machine.
- Permission prompts force apps to ask before touching your camera, microphone, or the files in folders like Documents and Downloads, which limits what a rogue program can quietly reach.
This is a genuinely good baseline, and it is the reason the honest answer to the antivirus question is "it depends" rather than a flat yes.
The malware that actually targets Macs
Almost nothing circulating on Macs today is a classic self-spreading virus. What you are far more likely to meet looks like this:
- Adware and browser hijackers: by far the most common Mac infection. Your homepage or search engine changes, results fill with sketchy links, and pop-ups appear on sites that never had them. It usually arrives bundled inside a free download from an unofficial site.
- Scareware and fake cleaners: apps that invent problems, flash alarming warnings, and demand a subscription to fix a mess that does not exist. Many people install their first piece of Mac malware while looking for a cleanup tool.
- Infostealers: the category growing fastest. These grab saved browser passwords, session cookies, cryptocurrency wallets, and keychain data within seconds of running, then often delete themselves. They spread through cracked apps, fake installer pages, and fake browser update pop-ups.
- Trojans hidden in pirated software: a cracked copy of an expensive app is a classic delivery vehicle, because installing it requires you to override the exact warnings Gatekeeper shows you.
Notice the pattern: nearly all of it needs you to install something. If these categories are new to you, our plain-language guide to viruses, trojans, and other malware types explains how each one behaves.
Where the built-in protection falls short
The gaps in macOS security line up uncomfortably well with how modern attacks work.
- XProtect only recognizes known malware. It works from a list. A brand-new infostealer variant can circulate for days before it is added, exactly when it spreads hardest.
- Adware lives in a gray zone. Apple removes the worst offenders, but plenty of junkware technically has your consent because you clicked through an installer, so the system leaves it alone.
- There is no scan button. macOS gives you no way to say "check this Mac now" or to scan an external drive full of old downloads. Everything happens invisibly, on Apple's schedule.
- Every protection can be overridden by you. A convincing fake installer page will walk you through bypassing Gatekeeper or pasting a command into Terminal. Attackers write those instructions because people follow them.
- None of it evaluates websites or messages. Fake login pages and scam pop-ups do not need malware at all, so the built-in stack barely touches them. That is a judgment problem, not a software one.
So, does your Mac need antivirus software?
You probably do not need extra software if all of the following are true: you install apps only from the App Store or from a small set of well-known developers' own sites, automatic updates are on, you are the only person using the machine, and you would never paste a command from a website into Terminal.
A third-party antivirus starts earning its keep when any of these apply:
- You regularly download software, plugins, or tools from outside the App Store.
- The Mac is shared with kids, students, or family members who click first and ask later.
- You handle sensitive material on it: client files, financial records, business email.
- You want an on-demand scanner, scheduled scans, or a second opinion on files before you open them.
- You want web protection that warns you before a scam or fake login page loads, which is where most real-world damage now starts.
If you do add one, install a reputable antivirus from the developer's official site or the App Store, never from a pop-up or an ad, since fake security software is one of the most common Mac infections. And keep expectations realistic: no scanner fixes risky habits. The right call depends on your devices and how each person in your household uses them, so weigh the same questions for every machine you own, not just the Mac.
Signs your Mac may already be infected
Mac malware is usually noisy in small ways. Watch for these:
- Your browser homepage or default search engine changed, and it changes back after you fix it.
- Extensions you never added appear in your browser.
- Ads or warning pop-ups show up outside the browser, on the desktop itself.
- A configuration profile you did not create appears under System Settings, then General, then Device Management. Adware uses profiles to lock in its settings.
- Unknown apps show up under System Settings, then General, then Login Items & Extensions, meaning something launches itself at every login.
- Web pages redirect through unfamiliar addresses before landing where you asked to go.
A hot, loud, or slow Mac on its own is weak evidence. Combined with any of the above, take it seriously.
How to check and clean a Mac yourself
Before paying for anything, spend fifteen minutes on a manual sweep.
- Open System Settings, then General, then Login Items & Extensions. Remove anything you do not recognize.
- Still under General, look for Device Management. If a profile exists that you or your employer did not install, select it and remove it.
- Check your browser's extensions page and delete anything unfamiliar. In Safari, that is the Safari menu, then Settings, then Extensions.
- Open the Applications folder and drag any app you never installed to the Trash, then empty the Trash.
- Reset your browser's homepage and search engine if they were changed.
- If problems persist, or you recently ran a strange installer, run a full scan with a reputable antivirus, then change the passwords on your important accounts from a device you trust. Stolen logins are the real damage, not the file itself.
Habits that protect a Mac better than any scanner
Since almost all Mac malware needs your help to get installed, your habits are the strongest layer you have.
- Keep everything updated. Open System Settings, then General, then Software Update, and turn on automatic updates. This is how XProtect's malware list stays current, too.
- Download from the source. The App Store or the developer's own website, nothing else. Skip download portals, and never install anything a pop-up tells you to install.
- Treat override instructions as a red flag. Any site that teaches you to bypass a macOS security warning to run its software is telling you exactly what it is.
- Move passwords out of the browser. Infostealers target the browser's saved password file first. A dedicated password manager such as Bitwarden or 1Password keeps logins encrypted behind a separate master password.
- Turn on two-factor authentication for your email account, your bank, and your Apple Account, so a stolen password alone is not enough.
- Back up with Time Machine to an external drive. A current backup turns most disasters into an inconvenience.
- Know your exposure. Run your address through our free email breach checker to see whether your logins are already circulating from past leaks.
A ten-minute Mac checkup
Work through this list once, and you will be better protected than most Mac owners, with or without antivirus.
- Open System Settings, then General, then Software Update. Install anything waiting and turn on automatic updates.
- Under Privacy & Security, confirm apps are only allowed from the App Store and identified developers.
- Review Login Items & Extensions and remove anything you cannot name.
- Check General, then Device Management for profiles you did not create.
- Open your browser's extensions list, delete unknowns, and reset your search engine if it was changed.
- Turn on two-factor authentication for your email account, since password resets for everything else flow through it.
- Pick your download rule now and keep it: the App Store or the developer's real site, nothing else. That one habit blocks most Mac malware before any scanner ever gets a look.
