Start with the myth: Macs are usually well protected, but they are not immune to malware. Apple itself says malware can reach a Mac through websites, email, messages, and downloaded content.［1］［2］

So if your Mac has strange alerts, browser redirects, constant fan noise, or apps you do not remember installing, do not focus on one pop-up. Check system settings, login items, browser extensions, and malware scanning together.

Use the online security guide as the baseline: it connects this risk to account, device, browser, and network hardening.

Key Takeaways

Apple states that malware can reach a Mac through downloads, and items from unknown sources should be removed.［1］

Apple also warns that bypassing system checks to open an unchecked app is one common route to malware on Mac.［2］

Login Items & Extensions is an important place to inspect suspicious auto-start items.［3］

If a page tells you to call immediately to fix your computer, treat it as a fake virus alert or tech-support scam first.［4］

A reliable check usually means reviewing symptoms, login items, extensions, suspicious apps, updates, and a full scan.［1］［2］［3］

First, Check These 6 Signs Your Mac May Be Off

1. It suddenly slows down, heats up, or runs the fan constantly

Suspicious background processes, adware, or other malicious activity can consume resources.［5］

2. The browser keeps redirecting

A changed homepage, hijacked search results, or random ad pages often point to extensions or browser hijacking.

3. Pop-ups and “security warnings” increase sharply

Be especially careful when they demand that you download a tool, call a number, or pay for cleanup.

4. Unknown apps appear in your Applications folder

If you do not remember installing an app, do not assume it is harmless.

5. Strange items open automatically after login

This is when Login Items & Extensions is worth checking.［3］

6. macOS asks you to bypass a security check to open an app

Apple warns that this is one common path for malware infection on Mac.［2］

How to Check a Mac for Malware: 6 Steps

1. Recall what you installed recently

Focus on:

Installers downloaded outside trusted sources;
“Player updates,” cleanup tools, or cracked software;
Email or message attachments;
Apps that asked you to click Open Anyway.［1］［2］

This narrows the search quickly.

2. Inspect the Applications folder

Look for apps that:

You did not install intentionally;
Have vague names;
Use rough icons or unknown publishers;
Appeared around the time symptoms started.

Apple recommends moving suspicious items from unknown sources to the Trash.［1］

3. Check login items and background extensions

Go to System Settings > General > Login Items & Extensions.［3］ This area is useful for catching:

Startup items you do not recognize;
Background items that do not need to run automatically;
Extensions from unclear sources.

4. Review browser extensions and default settings

Many “Mac virus” cases turn out to be:

Malicious extensions;
A changed search engine;
A hijacked new-tab page;
Website notification permissions that keep pushing alerts.

Do not skip the browser.

5. Update macOS and browsers, then run a full scan

Apple’s security documentation explains that macOS uses layers such as Gatekeeper, Notarization, and XProtect to block and remediate malware.［4］ Keeping the system current is part of both diagnosis and repair.

If you suspect a malicious download, a full scan matters more.

6. Watch whether symptoms return after cleanup

If strange behavior returns after removing apps, clearing extensions, and updating the system, a persistence path may still exist. Do not keep signing in to important accounts on the same device until you understand it.

What Is Easy to Misread?

Treating fake virus pop-ups as real system alerts

Real security warnings do not pressure you to call a random number immediately.［4］

Assuming “Macs do not get malware”

That belief is exactly what weakens download and permission habits.

Deleting one suspicious app and calling it done

If browser extensions, login items, or notification permissions remain, the problem can come back.

How to Reduce Mac Malware Risk Day to Day

Do not casually bypass macOS security checks to open apps;［2］
Download from trusted sources when possible;
Review login items and extensions regularly;
Exit fake virus alerts instead of clicking through in panic;［4］
Keep macOS, browsers, and security tools updated.［4］

If the problem is a full-screen scare alert, read what a fake virus alert is.

Summary

Macs are not immune. Malware can still arrive through downloads, extensions, and phishing paths.
The most useful places to check are Applications, Login Items & Extensions, and browser settings.
Any flow that asks you to bypass security checks or call immediately should raise suspicion.
If symptoms return after cleanup, do not treat it as a small annoyance.

FAQ

Can Macs get viruses or malware?

Yes. Apple states that malware can harm Macs and your privacy.［1］

Where should I check first for Mac malware?

Start with recent downloads and installs, then check Applications, login items, extensions, and browser settings.

Why can browser-only problems still be malware-related?

Many problems come from adware, hijacking extensions, or notification permissions rather than full system crashes.

What does “Apple can’t check this app for malicious software” mean?

It means the app has not passed Apple’s relevant checks. Apple warns that manually bypassing this prompt can be an infection path.［2］

Is updating macOS enough?

Not always. Updates matter, but suspicious apps and extensions still need to be removed.

Can a VPN scan my Mac for malware?

No. A VPN protects the network connection; malware already on the system still needs local checks and security tools.

Disclaimer

This article is for general digital safety education only. It does not constitute forensic, repair, or enterprise endpoint-response advice. macOS versions and interface paths may vary.

As the publisher, AethoVPN notes that Mac malware remains outside what a VPN can fix.

Sources

Apple Support, What is malware on Mac?: https://support.apple.com/en-gw/guide/mac-help/mh27449/mac
Apple Support, Apple can’t check app for malicious software: https://support.apple.com/guide/mac-help/apple-cant-check-app-for-malicious-software-mchleab3a043/mac
Apple Support, Change Login Items & Extensions settings on Mac: https://support.apple.com/en-lamr/guide/mac-help/mtusr003/mac
Apple Platform Security, Protecting against malware in macOS: https://support.apple.com/guide/security/protecting-against-malware-sec469d47bd8/web
Microsoft Security, What is malware?: https://www.microsoft.com/en-us/security/business/security-101/what-is-malware

Sources checked 8 May 2026.

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