Malware Protection

Malware protection covers the technologies and processes that defend systems against malicious software. It encompasses prevention, detection and response to viruses, ransomware, trojans, spyware and other forms of malware.

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What is malware protection?

Malware (malicious software) is a collective term for software designed to harm, disrupt or gain unauthorised access to systems. Malware protection refers to the measures that prevent malware from infecting systems and limit the damage if it does.

Traditional antivirus software that matched files against a database of known threats is no longer sufficient. Modern malware uses polymorphism (modifying itself), fileless techniques (running in memory) and living-off-the-land attacks (abusing legitimate system tools). This demands advanced detection methods.

Malware protection is closely linked to endpoint security, which protects the devices malware typically targets. Together with web filtering, DNS security and patch management, it forms a layered defence.

Malware types

Malware comes in many variants:

Ransomware: Encrypts the victim's data and demands a ransom for the decryption key. Often the most business-critical threat. Backup and network segmentation limit the damage.
Trojans: Disguise themselves as legitimate software to trick users into installing them. They can give the attacker remote access to the system.
Worms: Spread automatically across networks without user interaction. They exploit vulnerabilities in software and protocols.
Spyware: Monitors the user's activity and sends data to the attacker. It can collect passwords, credit card details and other sensitive data.
Fileless malware: Runs exclusively in memory and leaves no files on disk. Harder to detect with traditional methods.

Stay up to date through threat intelligence to understand which malware types are most active in your sector.

Defence in layers

Effective malware protection requires multiple layers:

Endpoint protection: EPP/EDR solutions with behavioural analysis, machine learning and sandboxing.
Email filtering: Scans incoming emails for malicious attachments and links. Email is the most common attack vector.
Web filtering: Web filters and DNS security block access to known malicious sites.
Patch management: Patch management closes the vulnerabilities that malware exploits. It is one of the most effective preventive measures.
Network segmentation: Segmentation prevents malware from spreading unimpeded through the network.
Security awareness: Training employees to recognise phishing and other attack methods. People are often the weakest link.

Have an incident response plan ready for malware infections. Time is critical, and a clear plan reduces the damage significantly.

Regulations and standards

CIS 18 dedicates Control 10 to malware defence, requiring enabled anti-malware, automatic updates and centralised management.

ISO 27001 and Annex A include control A.8.7 on protection against malware. An ISMS must define malware protection as part of technical and organisational measures.

NIS2 requires organisations to have measures against cyber threats. DORA imposes similar requirements on financial institutions. Under GDPR, malware protection is a fundamental measure for protecting personal data against unauthorised access.

Frequently Asked Questions about Malware Protection

What is the difference between malware and a virus?

Malware is a collective term for all malicious software. A virus is one type of malware that spreads by inserting its code into other files. Other types include ransomware, trojans, worms, spyware and adware.

Is antivirus still necessary?

Traditional signature-based antivirus is not sufficient on its own, but malware protection remains essential. Modern solutions (EDR/XDR) use behavioural analysis and machine learning, catching far more than signature-based products alone.

What should you do if you discover malware?

Isolate the infected device from the network, notify the security team and follow the organisation's incident response plan. Avoid shutting down the device, as this may destroy forensic evidence. Analyse the extent of the malware before cleaning and restoring.

How do you protect against ransomware?

Combine multiple layers: malware protection, email filtering, web filtering, regular backup, patch management and security awareness. Test regularly that backups can be restored. Segment the network so that ransomware cannot spread unimpeded.