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Yes, MacBooks can get viruses. The idea that Macs are immune to malware is one of the most persistent myths in tech, and it has not been true for a long time. macOS is more locked down than Windows in some ways, but it is not invincible. Malware authors have been targeting Macs with increasing frequency, and the threats are real.
Apple builds several layers of security into every Mac. Those defenses catch a lot of threats automatically. But they do not catch everything, and the gap between “pretty secure” and “bulletproof” is where Mac users get into trouble.
Why Do People Think Macs Can’t Get Viruses?
This myth has roots in two things that were once partially true but are now outdated.
First, market share. For most of the 2000s and 2010s, Windows dominated the desktop market with 90%+ share. Malware authors go where the users are, and writing malware for Windows reached a far bigger pool of potential victims. Macs simply were not worth the effort for most attackers.
Second, Apple’s marketing leaned into this advantage. The famous “Get a Mac” ad campaign from 2006 to 2009 directly positioned Macs as virus-free compared to PCs. That messaging stuck in public consciousness long after it stopped being accurate.
Today, macOS has roughly 15-20% desktop market share globally, and that number is even higher in certain demographics like creative professionals, developers, and students. That is more than enough to attract serious attention from malware developers.
What Built-In Security Does macOS Have?
Apple does not leave Mac users unprotected. macOS includes multiple security layers that work behind the scenes. Most users never interact with these features directly, but they are constantly running in the background.
| Security Feature | What It Does |
|---|---|
| Gatekeeper | Blocks apps that are not signed by identified developers or downloaded from the App Store. Shows a warning if you try to open unverified software. |
| XProtect | Apple’s built-in antivirus that runs silently. It checks downloaded files against a database of known malware signatures and updates automatically. |
| Notarization | Before an app can run on macOS, Apple scans it for malicious content. Apps that pass get a digital stamp of approval. Apps that fail are blocked. |
| System Integrity Protection (SIP) | Prevents any process – including ones with root access – from modifying protected system files and folders. |
| App Sandbox | Limits what each app can access on your system. A sandboxed app cannot read files from other apps, access your camera without permission, or modify system settings. |
| Malware Removal Tool (MRT) | Automatically removes known malware that has already made it onto your system. Runs during system updates and periodically in the background. |
These features work well together. Gatekeeper and Notarization try to stop bad software before it runs. XProtect catches known threats at the point of download. SIP and App Sandbox limit damage if something does get through. MRT cleans up after the fact.
The weak link is the word “known.” All of these tools rely on Apple identifying a threat first. Brand-new malware – sometimes called zero-day threats – can slip through until Apple updates its definitions.
What Types of Malware Target Macs?
Mac malware comes in several forms, and not all of it behaves like a traditional virus. Some types are more annoying than dangerous, while others can steal sensitive data or lock you out of your files entirely.
Adware is the most common type of Mac malware by a wide margin. It hijacks your browser with pop-up ads, redirects your searches, and installs unwanted browser extensions. It rarely damages your system, but it makes using your Mac miserable.
Trojans disguise themselves as legitimate software. You might download what looks like a PDF reader, a Flash Player update (still circulating despite Flash being dead since 2020), or a cracked version of a paid app. Once installed, the trojan does something entirely different from what you expected.
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Ransomware encrypts your files and demands payment for the decryption key. While less common on Mac than on Windows, it exists. The KeRanger ransomware in 2016 was the first fully functional ransomware to target macOS.
Cryptominers quietly use your Mac’s CPU and GPU to mine cryptocurrency for someone else. Your Mac runs hot, the fans spin constantly, and your electricity bill goes up while the attacker collects the coins.
Spyware records what you type, captures screenshots, accesses your webcam, or logs your browsing activity. Some spyware targets individuals specifically, while other variants cast a wide net.
Notable Mac Malware Examples
The following table shows real Mac malware that made headlines. These are not theoretical threats – they infected real machines in the wild.
| Malware Name | Year | Type | What It Did |
|---|---|---|---|
| Shlayer | 2018-2020 | Trojan/Adware | Distributed through fake Adobe Flash Player updates. At its peak, it was detected on roughly 1 in 10 Macs scanned by security tools. |
| Silver Sparrow | 2021 | Trojan | One of the first malware strains built natively for Apple Silicon (M1). Found on approximately 30,000 Macs across 153 countries before Apple revoked its certificates. |
| XCSSET | 2020-2022 | Trojan/Spyware | Targeted Xcode developer projects. It could steal Safari cookies, inject JavaScript into web pages, and take screenshots without permission. |
| MacStealer | 2023 | Info Stealer | Extracted passwords from iCloud Keychain, credit card data, cryptocurrency wallets, and sensitive files. Sold as malware-as-a-service on Telegram. |
| Atomic Stealer (AMOS) | 2023-2024 | Info Stealer | Stole Keychain passwords, browser data, cryptocurrency wallets, and files. Distributed through fake browser updates and malicious ads. |
How Do I Know If My Mac Has a Virus?
Mac malware often tries to stay hidden, but it usually leaves clues. If your Mac has been acting differently and you cannot explain why, check for these signs.
Sluggish performance that appeared suddenly is a red flag. If your Mac was running fine last week and now takes forever to open apps or switch between windows, something might be consuming system resources in the background.
Pop-up ads appearing outside your web browser are almost always a sign of adware. Legitimate macOS does not display pop-up advertisements on your desktop or in your notification center.
Your browser’s homepage or default search engine changed without you doing it. Browser redirects – where clicking a link sends you to a completely different site – are another common symptom.
Apps you do not recognize appearing in your Applications folder or Dock should raise suspicion. The same goes for browser extensions you did not install.
High CPU usage when you are not doing anything intensive points to a cryptominer or other background process. If your fans are spinning loudly while you are just reading email, that is worth investigating.
How to Check Your Mac for Malware
You do not need to install anything to do a basic malware check. macOS gives you the tools to investigate suspicious activity yourself.
Check Activity Monitor for suspicious processes. Open Activity Monitor from Applications > Utilities (or search for it with Spotlight). Click the CPU tab and sort by “% CPU” to see what is using the most processing power. Look for processes with names you do not recognize that are consuming significant resources. Do the same with the Memory tab. If something looks unfamiliar, search for the process name online before killing it – some legitimate macOS processes have odd names.
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Review your Login Items. Go to System Settings > General > Login Items. These are apps and processes that start automatically when you log in. If you see anything you did not add or do not recognize, that is a potential sign of malware setting itself up for persistence.
Check your browser extensions. Open each browser you use and go to its extensions or add-ons page. In Safari, go to Settings > Extensions. In Chrome, type chrome://extensions in the address bar. Remove anything you did not intentionally install.
How to Remove Malware From a Mac
If you suspect your Mac is infected, follow these steps in order. Starting in Safe Mode prevents most malware from loading, making it easier to remove.
- Boot into Safe Mode. For Apple Silicon Macs (M1, M2, M3, M4): Shut down the Mac, then press and hold the power button until you see “Loading startup options.” Select your startup disk, then hold the Shift key and click “Continue in Safe Mode.” For Intel Macs: Restart and immediately hold the Shift key until you see the login screen. Safe Mode disables third-party startup items and runs basic disk checks.
- Delete suspicious applications. Open the Applications folder and look for apps you did not install or do not recognize. Drag them to the Trash. Then go to the Library folder (in Finder, click Go in the menu bar, hold Option, and click Library) and check the LaunchAgents and LaunchDaemons folders for unfamiliar files.
- Remove unknown browser extensions. Open each browser and go to its extensions page. Disable and remove any extensions you do not recognize. Reset your homepage and default search engine if they were changed.
- Clear browser caches and data. In Safari, go to Settings > Privacy > Manage Website Data and click Remove All. In Chrome, go to Settings > Privacy and Security > Delete browsing data. Select “All time” for the time range.
- Run Apple’s Malware Removal Tool. Install any pending macOS updates by going to System Settings > General > Software Update. Apple bundles MRT and XProtect definition updates with system updates, so installing the latest update ensures these tools can detect the newest known threats.
- Restart normally. After completing the steps above, restart your Mac without Safe Mode. Monitor it over the next few days for any return of symptoms.
If the problem persists after these steps, consider running a reputable third-party malware scanner like Malwarebytes (the free version handles on-demand scanning) for a more thorough check.
Do I Need Antivirus Software on a Mac?
For most home users, the answer is probably not – with a big asterisk. macOS built-in security tools handle the majority of threats effectively, and safe browsing habits cover most of the remaining risk.
If you stick to downloading apps from the App Store or directly from known developers, keep macOS updated, and do not click on suspicious links or email attachments, you are already doing more than most people to stay safe. Apple’s Gatekeeper, XProtect, and Notarization handle the rest.
That said, there are situations where additional antivirus protection makes sense. Business users who handle sensitive client data have more to lose from a breach. Users who regularly download software from outside the App Store are exposed to more risk. People who share files with Windows users might unknowingly pass along Windows malware that macOS ignores but would infect a PC.
If you decide you want extra protection, stick with well-known security software. Malwarebytes, Norton, and Bitdefender all offer Mac-specific products. Avoid downloading antivirus tools from random websites – fake antivirus software is itself a common form of malware.
How to Protect Your Mac From Viruses and Malware
Prevention is always easier than cleanup. These habits significantly reduce your risk of infection.
- Keep macOS updated. Apple pushes security patches and updated malware definitions through system updates. Go to System Settings > General > Software Update and enable automatic updates. Do not ignore update notifications – they often contain fixes for actively exploited vulnerabilities.
- Only install apps from the App Store or verified developers. If macOS warns you that an app is from an unidentified developer, take that warning seriously. Most legitimate software is either in the App Store or available directly from the developer’s official website.
- Do not click suspicious links. Phishing emails and malicious ads are the most common delivery methods for Mac malware. If an email or pop-up is urging you to act immediately – your account is locked, you won a prize, your system is infected – it is almost certainly fake.
- Use strong, unique passwords. Use a password manager (Apple’s Passwords app works well) and enable two-factor authentication on every account that supports it. A stolen password is often the first step in a targeted attack.
- Be careful with browser extensions. Only install extensions from official browser extension stores, and remove any you are not actively using. Malicious extensions can read everything you type into web forms, including passwords and credit card numbers.
- Turn on FileVault. Go to System Settings > Privacy & Security > FileVault and turn it on if it is not already enabled. FileVault encrypts your entire startup disk, so even if someone physically steals your Mac, they cannot access your data without your password.
Frequently Asked Questions
Are Macs Safer Than Windows PCs?
Macs do have some security advantages. macOS requires apps to request permission before accessing your camera, microphone, files, and other sensitive resources. Gatekeeper blocks unsigned software by default. The Unix-based architecture separates user and system processes more strictly than older versions of Windows did.
However, Windows has closed the gap significantly. Windows Defender, SmartScreen, and hardware-based security features like TPM 2.0 and Secure Boot provide strong protection on modern Windows 11 machines. Neither platform is inherently “safe” – both require the user to practice good security habits.
Do I Need Antivirus on My Mac?
Most casual users do not. macOS built-in protections – Gatekeeper, XProtect, Notarization, and MRT – provide a solid baseline defense. Keeping macOS updated and being cautious about what you download covers the majority of threats. Power users, business users, or anyone handling sensitive data may want an additional layer of protection from a third-party tool.
Can Macs Get Ransomware?
Yes. While Mac ransomware is less common than Windows ransomware, it exists. KeRanger in 2016 was the first major Mac ransomware attack, and several variants have appeared since. The best protection is keeping regular backups (Time Machine to an external drive works well) so you can restore your files without paying a ransom.
How Do I Know If My Mac Has a Virus?
Common signs include sudden performance drops, unexpected pop-ups outside your browser, browser redirects, unfamiliar apps in your Applications folder, and consistently high CPU usage when you are not running demanding software. Open Activity Monitor to check for suspicious processes, review your Login Items in System Settings, and inspect your browser extensions for anything you did not install.
Sources
Apple – Apple Platform Security Guide | Malwarebytes – 2024 State of Malware Report
