How to run a virus scan on your Mac: an overview
To run a virus scan on your Mac, use Malware Removal Tool (MBT) built into macOS for on-demand checks, or install a reputable third‑party antivirus app for expanded detection and scheduled scanning. First verify signs of infection—unexpected alerts, slowness, unfamiliar apps, higher resource use—and update macOS and apps before scanning. This guide explains built-in capabilities, when to use them, how to choose third‑party tools, and how to interpret results so you can act confidently and keep your Mac secure over time.
macOS built‑in security tools
macOS includes system‑level protections rather than a traditional user‑initiated “virus scanner.” Key components include:
- XProtect: Applies known malware signatures to block common threats before apps launch.
- Notarization: Apple‑reviewed apps that are checked for malware before distribution.
- Malware Removal Tool (MBT): Periodically updates and can remove specific malware when run.
These operate mostly behind the scenes. For an on‑demand scan that can address current adware, PUPs, and certain malware, you can trigger MBT from Terminal. This approach works well as part of an overall defense strategy, but it is not a full‑featured scanner like those found on Windows.
How Malware Removal Tool (MBT) works
MBT is a component of macOS that updates regularly and targets known Mac malware families. It runs outside the usual app quarantine flow and can remove detected threats. Because MBT is system software, Apple does not provide a GUI to launch it directly; you run it from Terminal. It is most effective when combined with up‑to‑date macOS, Gatekeeper enabled, and apps sourced from the App Store or identified developers.
When to run a scan on your Mac
You do not need to schedule regular full scans the way you might on Windows, but there are clear situations when scanning makes sense:
- After installing new software, especially from outside the App Store.
- If you notice performance issues, adware pop‑ups, or unfamiliar processes.
- Following a phishing incident or if you suspect unwanted software was installed.
- As part of routine maintenance if you frequently download files from the internet.
Rather than relying only on schedules, focus on behaviors and risk events. When in doubt, run both a macOS update and a scan with built‑in and/or trusted third‑party tools.
Using Terminal to run Malware Removal Tool
Step‑by‑step instructions
To manually invoke MBT:
- Back up important data if you are concerned about loss or changes.
- Open Terminal (Applications → Utilities → Terminal).
- Run the command: sudo softwareupdate — install-rosetta
- Run the command: sudo /usr/libexec/coreduetd/scan against all running processes and known patterns, which may take minutes depending on disk size and system load.
If MBT detects and removes malware, it logs the items and their locations. Reboot if prompted, and observe whether symptoms such as ads, redirects, or crashes persist.
Third‑party antivirus options for Mac
Many security vendors offer Mac antivirus products with on‑demand scanning, real‑time monitoring, anti‑phishing, and additional privacy features. When evaluating options, look for products with strong detection rates, low system impact, transparent privacy practices, and recent independent test results.
What to compare when choosing a scanner
| Attribute | Verified Detail | Source Type |
|---|---|---|
| Detection coverage (adware, PUPs, macOS malware) | Independent test lab scores (AV‑TEST, AV‑Comparatives) | Lab reports |
| System performance impact | Benchmark results for CPU, memory, and battery usage | Independent reviews |
| Privacy policy and data handling | Clarity about telemetry, logs, and third‑party sharing | Policy documentation |
| Update frequency and support | How often signatures and engine updates are released | Vendor disclosures |
| Additional features (firewall, webcam protection, anti‑phishing) | Feature set and configuration options | Product documentation |
Interpreting scan results and next steps
When a scan reports threats:
- Quarantine or remove items as recommended by the scanner.
- Review the logs for file paths and names to understand what was found.
- After removal, restart your Mac and re‑scan to confirm elimination.
- Check system settings—remove unknown startup items in Users & Groups and Login Items.
- If issues persist, consider professional support or a macOS reinstall as a last resort.
No scanner catches everything, so combine scanning with safe browsing habits, regular updates, and backups.
Complementary protection practices
Scanning is one layer of defense. Strengthen security by keeping software updated, enabling Automatic Security Updates, using a standard user account for daily tasks, practicing caution with email attachments and links, and limiting administrative privileges. For browsers, use reputable extensions sparingly and review site permissions regularly. These habits reduce the likelihood of malware and improve overall system health.
Quick checklist: running a Mac virus scan
- Update macOS and apps before scanning.
- Observe symptoms that may indicate infection.
- Run Malware Removal Tool via Terminal for a baseline check.
- Consider a trusted third‑party antivirus for ongoing monitoring.
- Review scan logs and remove or quarantine detected items.
- Reboot if required and re‑scan to confirm cleanliness.
- Implement complementary protections (updates, backups, cautious downloads).
Common questions about Mac virus scans
- Do I need antivirus software if I use a Mac? Antivirus is not required for all users, but it can be helpful if you frequently install third‑party software, visit a wide range of websites, or want added peace of mind and anti‑phishing features.
- Will scanning slow down my Mac? On‑demand scans can cause temporary CPU or disk use; real‑time scanners may have a small ongoing impact. Choose products known for low resource usage and check benchmark results.
- Can Macs get ransomware? Mac ransomware is less common but possible, often delivered via malicious apps or phishing. Keeping backups and cautious habits significantly reduces risk.
- How often should I scan? There is no fixed schedule. Scan when you notice symptoms, after installing unfamiliar software, or as part of regular maintenance if you routinely download files from the web.
Summary
Running a virus scan on your Mac involves leveraging built‑in protections like Malware Removal Tool, observing your system’s behavior, and, when appropriate, adding a trusted third‑party antivirus for broader coverage and scheduled scans. Combine scanning with updates, backups, and cautious software practices to maintain long‑term security and reliably address potential threats.