For many years, Mac users believed their computers were almost immune to malware, viruses, and hacking attempts that commonly affect Windows PCs. While macOS is indeed known for its strong security architecture, the truth is that Macs are not completely invulnerable.

Cybercriminals continuously look for ways to exploit vulnerabilities in operating systems, applications, and even user behavior. If attackers manage to break through these defenses, they could potentially access sensitive files, spy on your activity, or steal personal information.

In this guide, you’ll learn whether Macs can really be hacked, how to recognize warning signs of a compromised Mac, and what steps you should take immediately if you suspect someone is accessing your computer remotely.

Signs Your Mac May Have Been Hacked

Before assuming the worst, it’s important to know that many strange behaviors on a Mac are caused by software bugs or system processes, not hackers.

For example, macOS background processes like “Spotlight indexing” or “kernel_task” (used to manage CPU temperature) can temporarily cause high CPU usage or slow performance.

However, there are still warning signs you should not ignore.

Common Symptoms of a Hacked Mac

• Your Mac runs extremely slow even when idle
• The fans run loudly and the device becomes unusually hot
• Your browser homepage suddenly changes
• Frequent redirects to unknown websites
• Suspicious pop-ups claiming “Your Mac is infected”
• Apps appear that you don’t remember installing
• Extremely high CPU usage in “Activity Monitor
• Strange login alerts or unusual network activity

If none of these issues occur, your Mac is probably not hacked. But if several signs appear at the same time, further investigation is recommended.

What to Do Immediately If You Think Your Mac Was Hacked

If you believe someone may have gained access to your Mac, take these steps as soon as possible:

1. Disconnect your Mac from Wi-Fi and the internet.
2. Change your important passwords using another trusted device.
3. Update your Apple ID credentials.
4. Remove any unknown devices linked to your Apple account.
5. Back up important files carefully.
6. Run a full malware scan.
7. Install the latest macOS security updates.
8. Reinstall macOS if the system appears compromised.
9. Enable built-in security protections like FileVault encryption and the macOS firewall.

These steps significantly reduce the risk of further damage or data theft.

How to Check If Your Mac Has Been Hacked

There are several system checks you can perform to verify whether your Mac is compromised.

1. Check macOS System Settings

Start by reviewing your system settings for suspicious changes.

Open System Settings and check the following areas:

Users & Groups

• Ensure no new administrator accounts were added without your permission.
• Confirm that your account privileges haven’t been modified.

Login Items

Go to:

System Settings → General → Login Items

Look for apps configured to launch automatically that you didn’t install.

Privacy & Security

Check these areas carefully:

• Full Disk Access
• Extensions
• Configuration Profiles
• Remote Desktop permissions

Unexpected entries here may indicate unauthorized software.

Sharing Settings

Go to:

System Settings → General → Sharing

Ensure the following are disabled unless you intentionally enabled them:

• Screen Sharing
• Remote Login
• Remote Management
• File Sharing

These features could allow remote access if misused.

2. Use Activity Monitor to Detect Suspicious Processes

The macOS system tool “Activity Monitor” helps identify unusual system activity.

To inspect running processes:

1. Open Activity Monitor
2. Click View → All Processes
3. Sort processes by CPU usage

Look for programs consuming large CPU resources while the Mac is idle.

Legitimate apps like browsers or video software can use significant resources, but unknown processes should be researched online before terminating them.

Also review the following tabs:

Network Tab

Check for processes sending large amounts of data unexpectedly.

Memory Tab

Look for apps consuming excessive RAM.

Some processes associated with remote access include:

• screensharingd
• ARDAgent
• sshd
• remoted

These don’t necessarily mean your Mac is hacked, but they deserve attention if you didn’t enable remote access.

3. Look for Unknown Applications

Another quick check is reviewing installed apps.

Open Finder → Applications and sort by Date Added.

Look for:

• Apps you don’t recognize
• Duplicate apps (which may be fake versions)
• Software installed around the time problems started

If anything seems suspicious, remove it immediately.

4. Check Browser Extensions

Browser hijacking is one of the most common threats affecting Mac users.

Check extensions in your browsers:

Safari

Safari → Settings → Extensions

Chrome

Chrome → Settings → Extensions

Remove any extension you don’t remember installing.

Malicious extensions often cause:

• redirecting searches
• pop-up ads
• homepage changes

5. Scan Your Mac for Malware

Although macOS includes built-in malware detection via XProtect, it operates automatically and cannot be manually triggered.

For this reason, running a third-party antivirus scan is recommended.

Popular Mac security tools include:

• Intego Mac Internet Security
• Norton 360 Deluxe
• McAfee Total Protection

Running a full system scan can quickly detect malware or suspicious software.

6. Check if Your Password Was Leaked

Sometimes hackers gain access through data breaches rather than malware.

You can check if your email address was exposed using services like Have I Been Pwned.

If your email appears in a breach database:

• change your password immediately
• enable two-factor authentication

How to Protect Your Mac From Hackers

macOS is already designed with strong built-in protections, but following these practices can make your Mac even safer.

Download Software Safely

Install apps only from:

• the Mac App Store
• official developer websites

Avoid Suspicious Links

Do not click links in emails or messages from unknown sources.

Use Secure Browsing

Consider private or incognito browsing modes when accessing sensitive sites.

Keep macOS Updated

Security updates often fix vulnerabilities discovered by researchers.

Enable Automatic Security Updates

Open:

System Settings → General → Software Update → Automatic Updates

Enable:

Install Security Responses and system files

Use a Password Manager

Password managers generate secure credentials for each account.

Popular options include:

• 1Password
• NordPass
• LastPass

Are Macs Really Safer Than Windows PCs?

While macOS has historically been targeted less often than Windows, the security gap is shrinking as Macs become more popular.

Apple uses several technologies to protect users, including:

• Gatekeeper, which blocks untrusted apps
• Hardware security through the Secure Enclave
• Built-in malware detection with XProtect
• Frequent security patches

However, no operating system is completely immune to cyber threats. The best protection is a combination of built-in security features, safe browsing habits, and regular updates.

Final Thoughts

Although Mac computers are generally secure, they can still be hacked under certain conditions. Fortunately, most suspicious behavior on macOS is caused by harmless system processes or buggy apps rather than malicious activity.

By monitoring your system, keeping macOS updated, and following good cybersecurity practices, you can dramatically reduce the risk of your Mac being compromised.

If you ever suspect your Mac has been hacked, acting quickly—disconnecting from the internet, changing passwords, and scanning for malware—can help protect your data and restore your system’s security.