Malware Types: A Guide to Recognising Them
Protect your systems from malware with the best IT security strategies. Learn about every type of malware and how to defend against it.
In this article
Malware (short for "malicious software") is a category of computer programs designed to damage or disrupt the operation of a computer, mobile device or network. It can take many forms and pursue different goals, but its overarching purpose is almost always to exploit a system's vulnerabilities for financial or strategic gain.
Types of malware:
- Viruses: programs that replicate themselves and can damage files and data. Viruses can be classified by how they reproduce:
- File infectors: viruses that attach themselves to executable files (for example, .exe).
- Boot sector infectors: viruses that attach themselves to a hard disk's boot sector.
- Macro viruses: viruses that use the macros of word-processing programs to reproduce.
Worms: a type of malware that spreads automatically across a network, exploiting vulnerabilities in the operating system or in applications.
Trojans: programs that pose as legitimate software but are actually designed to open a backdoor into the system. Trojans can be used to:
- Harvest information: steal sensitive data such as passwords or credit card numbers.
- Install further malware: deploy other types of malicious software onto the infected system.
- Ransomware: malware that encrypts a user's files and demands a ransom in exchange for the decryption key. Ransomware can be classified by its encryption method:
- Asymmetric: uses a public/private key pair for encryption.
- Symmetric: uses the same key for both encryption and decryption.
- Spyware: programs that collect information about a user without their consent. Spyware can be used to:
- Collect data: gather sensitive information such as passwords or credit card numbers.
- Monitor activity: track a user's activity on the infected system.
How malware spreads:
Email: malicious attachments or links;
Downloads: files downloaded from unsafe websites;
Network: connecting to unprotected public Wi-Fi networks;
USB devices: infected removable storage devices.
Symptoms of a malware infection:
System slowdown: your computer or mobile device becomes noticeably slower;
Error messages: unexpected pop-ups and warnings;
Configuration changes: settings changed without any action from the user.
How to protect yourself from malware:
Update your software regularly: make sure you are running the latest version of your operating system and applications;
Use antivirus software: install and regularly update a reliable antivirus product;
Avoid downloads from untrusted sources: only download files from trusted websites;
Use strong passwords: combine letters, numbers and symbols to protect your accounts;
Use a firewall: enable your operating system's firewall or install a reliable firewall product.
Advanced protection strategies:
Network traffic analysis: use tools such as Wireshark to analyse network traffic and detect suspicious activity;
System activity monitoring: use tools such as Process Explorer or System Monitor to keep an eye on system activity and spot suspicious processes;
Patch management: put a formal patch management process in place to make sure all installed software is always running the latest version.
Conclusion
Malware represents a real threat to IT security, but with the right precautions and a bit of know-how, you can significantly reduce the risk of infection. By keeping your software up to date, using a reliable antivirus and adopting good online security practices, you can protect yourself from malware and keep your data safe.
We hope this article has given you a useful overview of the malware threat and how to protect your systems.
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Related resources on cybersecurity
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Frequently asked questions
What is malware?
It's a computer program designed to damage or disrupt the operation of a computer, mobile device or network, exploiting system vulnerabilities for financial or strategic gain by an attacker.
What are the main types of malware?
The main types are viruses, worms, trojans, ransomware and spyware, each with its own way of spreading and its own goal, ranging from damaging files to stealing sensitive data such as passwords.
How does malware spread?
Mainly through malicious email attachments or links, downloads from unsafe websites, connections to unprotected public Wi-Fi networks, and infected removable USB storage devices plugged into a system.
What are the symptoms of a malware infection?
A noticeably slower system, unexpected pop-ups and error messages appearing on screen, and configuration settings changing without any action from the user themselves.
How do you protect yourself from malware?
By keeping software and the operating system regularly updated, using a reliable, up-to-date antivirus, avoiding downloads from untrusted sources, setting strong passwords and enabling a firewall on every device.
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