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Modern malware is far more sophisticated than the viruses of the 1990s. Here are the main threat categories your security software needs to handle.
Self-replicating code that attaches to files and spreads across systems.
Encrypts your files and demands payment for the decryption key. Devastating for businesses and individuals alike.
Silently monitors your activity, keystrokes, and screenshots, sending data to attackers.
Injects unwanted advertisements and can redirect your browser to malicious sites.
Disguised as legitimate software, trojans create backdoors for attackers to access your system.
Hide deep in the operating system, making them very difficult to detect and remove.
Use your CPU/GPU to mine cryptocurrency for attackers, slowing your device significantly.
Increasingly common on Android. Steals banking credentials, intercepts SMS 2FA codes, and tracks location.
Best Anti-Malware Tool
Windows, Mac, iOS, Android · Free (basic) / ~£30/yr Premium
Best for: Malware removal and ransomware protection
The industry standard for malware removal. Malwarebytes excels at catching threats that traditional antivirus misses — particularly adware, spyware, and ransomware. The free version is excellent for manual scans; Premium adds real-time protection.
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Cons
Best All-Round Antivirus Suite
Windows, Mac, iOS, Android · ~£35/yr (up to 5 devices)
Best for: Comprehensive all-in-one security suite
Consistently scores 99–100% in independent lab tests (AV-Test, AV-Comparatives). Includes a VPN (200MB/day free), password manager, webcam protection, and anti-phishing. One of the best value comprehensive security suites available.
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Best for Identity Protection
Windows, Mac, iOS, Android · ~£25/yr first year (5 devices)
Best for: Identity theft monitoring and dark web alerts
Norton 360 bundles antivirus, a no-log VPN, dark web monitoring, and a password manager. The dark web monitoring alerts you if your personal data appears in breach databases — a unique and valuable feature for identity protection.
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Best Built-In Option (Windows)
Windows only · Free (built into Windows 10/11)
Best for: Basic free protection on Windows
Microsoft Defender has improved dramatically and now scores well in independent tests. For most Windows users who practice safe browsing habits, it provides adequate baseline protection at zero cost. It is not sufficient on its own for high-risk users.
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Best Free Antivirus
Windows, Mac, iOS, Android · Free / ~£40/yr Premium
Best for: Free real-time protection on a budget
Avast's free tier offers real-time protection, a Wi-Fi security scanner, and a basic VPN. Detection rates are strong. Note: Avast was fined in 2024 for selling user data — review their privacy policy before installing if privacy is a concern.
Pros
Cons
| Product | Price/yr | Real-Time | VPN | Free Tier | Best For |
|---|---|---|---|---|---|
| Malwarebytes Premium | Free (basic) | Malware removal and ransomware protection | |||
| Bitdefender Total Security | ~£35 | Comprehensive all-in-one security suite | |||
| Norton 360 Deluxe | ~£25 | Identity theft monitoring and dark web alerts | |||
| Windows Defender | Free (built into Windows 10 | Basic free protection on Windows | |||
| Avast One Essential | Free | Free real-time protection on a budget |
Device running significantly slower than usual
CPU or fan running at full speed with no obvious cause
Browser redirecting to unexpected websites
Unexpected pop-up advertisements appearing
Battery draining unusually fast on mobile
Unusual network activity when device is idle
Files encrypted or renamed with unknown extensions
Contacts receiving messages you didn't send
If you suspect infection, run a Malwarebytes scan immediately — the free version is sufficient for detection and removal. Then follow our account recovery guide.
Windows Defender provides adequate baseline protection for most users. However, it is weaker against advanced threats, ransomware, and spyware compared to dedicated security suites. Running Malwarebytes alongside Defender (they are compatible) significantly improves protection at low cost.
Yes. While macOS is generally more secure than Windows, Mac malware is increasing. Adware, spyware, and ransomware targeting Macs have all been documented. Bitdefender and Malwarebytes both offer strong Mac protection.
Antivirus traditionally focuses on known virus signatures. Anti-malware uses broader behavioural detection to catch newer threats including ransomware, spyware, and adware. Modern security suites combine both approaches. Malwarebytes is the most respected dedicated anti-malware tool.