Malware -
what it is, types, examples, and how to stay protected

  • Malware is the umbrella term for all malicious software, including viruses, worms, spyware, ransomware, and more

  • Responsible for billions of dollars in global damages each year

  • Can infect Macs, PCs, and mobile devices through downloads, emails, or unsafe websites

  • Prevention and strong antivirus software are essential in 2025

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What is malware?

Malware - short for “malicious software” - is a blanket term for programs or code created to damage, steal, or exploit computers and networks. Unlike ordinary software, malware runs with harmful intent, often without the user’s knowledge.

It can infect individuals, stealing personal data or slowing down devices, as well as businesses, where malware often serves as the entry point for large-scale data breaches and ransomware demands.

Over the years, malware has evolved from simple computer viruses into a wide variety of threats. This diversity makes malware one of the broadest and most dangerous categories of cybersecurity threats:

Viruses

Programs that spread by infecting files and replicating when they are shared.

Worms

Self-replicating malware that spreads across networks without user action.

Trojans

Malicious software disguised as legitimate programs.

Ransomware

Locks files or systems until a ransom is paid.

Spyware

Secretly monitors activity to steal passwords, credit card numbers, or browsing history.

Adware

Bombards users with intrusive ads or redirects browsers to malicious sites.

Fileless malware

Operates in memory rather than files, making it harder to detect.

Learn more about other threats

How does malware work?

Malware can be introduced to your system in several ways:

01

Delivery

Attackers trick users into downloading infected files, opening malicious email attachments, or visiting compromised websites.

02

Exploitation

The malware takes advantage of vulnerabilities in software, operating systems, or human behavior.

03

Execution

Once inside, malware activates: stealing data, encrypting files, displaying ads, or spying on activity.

04

Propagation

Some malware spreads to other devices automatically, while others lie dormant waiting for activation

05

Impact

The attacker profits by selling stolen data, demanding ransom, or leveraging infected devices in larger botnets.

What are real-world
examples of malware?

Over the past few years, cyberattacks have grown in scale, cost, and sophistication. Here are some of the
most notable incidents:

2017

WannaCry

A ransomware worm that infected over 200,000 computers worldwide, disrupting hospitals, businesses, and governments. This attack showed how quickly malware can spread globally by exploiting unpatched systems.

2017

NotPetya

Originally disguised as ransomware, this destructive malware wiped systems across Ukraine and beyond, causing billions in damages. It remains a prime example of how malware can cripple national infrastructure.

2014-2022

Emotet

A modular malware strain spread through phishing emails that installed additional malicious payloads. It demonstrated how malware-as-a-service could evolve and be rented out to other cybercriminals.

2024

Kadokawa & Niconico

Malware deployed during a ransomware attack disrupted major Japanese media platforms, leaking over 254,000 user records. This case highlights how malware often works hand-in-hand with ransomware campaigns to maximize damage.

What are the risks and
impacts of malware?

Malware poses significant risks that can impact individuals, businesses, and even entire nations.

Data theft

A successful infection can lead to data theft, exposing personal records, financial details, or intellectual property. This stolen data is often sold on the dark web or used for identity theft.

Financial loss

Malware can also result in financial loss, draining bank accounts, causing fraudulent transactions, or forcing businesses to pay ransomware demands. Recovery costs—including system repair, lost revenue, and legal action—add to the damage.

Operational disruption

Businesses also face operational disruption, as malware can shut down networks, delay services, and erode customer trust. For industries like healthcare or finance, these interruptions can be catastrophic.

Legal & regulatory exposure

Malware often creates legal and regulatory exposure. Companies failing to protect customer data risk heavy fines under laws like GDPR and HIPAA, as well as lasting reputational harm.

Who is most at risk
from malware?

How can you protect
yourself from malware?

Protecting against malware requires a mix of safe habits and strong security tools:

Install antivirus software

Detects and removes malware before it can do harm.

Keep software updated

Apply patches to close vulnerabilities.

Avoid suspicious downloads

Don’t open attachments or install files from unverified sources.

Enable firewalls

Block unauthorized access to networks and systems.

Back up data regularly

Ensure files can be restored if they are encrypted or lost.

Educate users

Businesses should train employees on phishing and malware awareness.

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How Intego Antivirus can protect you from malware

Intego’s antivirus is built specifically to detect and stop malware before it can damage your Mac. Unlike generic tools, it is designed with the Apple ecosystem in mind, offering protection without slowing down performance.

Real-time threat detection

Identifies malware as it tries to install or run.

Firewall protection

Blocks malicious attempts to connect to or control your Mac.

System monitoring

Detects unusual activity that may signal malware infection.

Optimization tools

Removes junk files and optimizes performance after malware cleanup.

Automatic updates

Keeps your protection current with the latest malware signatures.

Easy-to-use interface

Protection built for everyday Mac users, with professional-grade security.

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Frequently asked questions

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With award-winning antivirus, firewall, VPN, and system optimization tools, Intego combines powerful defense with the simplicity and reliability Mac and PC users expect.

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