Preventing Hacking: Essential Tips for Online Security

Every time you connect to the internet, your computer becomes a potential target. Hackers don’t just go after big corporations – individuals, students, and teachers are targeted just as often. Understanding how attacks work and what you can do to stop them is the first step toward staying safe online. This post breaks down three of the most important areas of online security: malware and spyware, ransomware, and secure browsing habits.

Understanding spyware and malware
How malware and spyware infect your computer
Signs your computer may be infected
The role of antivirus and anti-spyware programs
Ransomware threats
How ransomware spreads
Why regular backups are your best defence
Secure browsing practices
Always use HTTPS websites
Keep your browser updated and clean
Think before you click
Use strong passwords and multi-factor authentication
Be cautious on public Wi-Fi
Putting it all together

Understanding spyware and malware

Malware is a broad term for any software intentionally designed to damage, disrupt, or gain unauthorized access to a computer system. The word itself is a combination of “malicious” and “software.” It encompasses viruses, worms, trojans, ransomware, spyware, adware, and more – all built to steal data, disrupt services, or cause financial harm.

Spyware is one of the most deceptive forms of malware. It is a category of malware that includes adware, keyboard loggers, trojans, and mobile information-stealing programs – all designed to collect your personal data without your knowledge. Once installed, it runs silently in the background, recording keystrokes, tracking websites you visit, and even accessing your camera or microphone.

How malware and spyware infect your computer

The most common entry points are ones most people interact with daily. Attackers disguise malicious files within regular downloads and websites, encouraging users to open them, often without realizing it. Other common delivery methods include:

Bundleware: Free software that secretly bundles spyware alongside a legitimate program you download.
Phishing emails: Phishing emails often appear to come from credible sources and contain a link along with an urgent request for the user to respond quickly.
Drive-by downloads: Spyware can be downloaded simply by visiting a compromised website or opening an HTML email.
Malicious ads: Even legitimate websites can be compromised if hackers insert malicious scripts into advertisements or downloadable content.

One particularly dangerous type of spyware is a keylogger, which records everything you type – passwords, emails, credit card numbers – and stores it in a hidden file for hackers to retrieve later. Another common variant is adware, which installs itself without permission, monitors your browsing history, and bombards you with intrusive ads.

Signs your computer may be infected

A spyware infection can create significant unwanted CPU activity, disk usage, and network traffic, leading to applications freezing, failure to boot, and system-wide crashes. Pop-up windows appearing even when you’re not browsing, sudden browser redirects, and unexplained slowdowns are all red flags worth investigating.

The role of antivirus and anti-spyware programs

Antivirus and anti-spyware software are your primary defences. Anti-spyware tools can either provide real-time protection by scanning network data and blocking malicious data, or they can execute scans to detect and remove spyware already on a system. Here are the most important protective steps to follow:

Install reputable security software and keep its virus definitions updated regularly.
Keep your operating system and apps updated. Spyware typically makes its way onto devices through gaps in code or vulnerabilities in operating systems, so patching these immediately is critical.
Avoid free software from unknown sources. The convenience often comes at the cost of hidden malware.
Use secure networks. Unsecured public Wi-Fi makes it easy for hackers to intercept your data or push malware onto your device.

Ransomware threats

Ransomware is one of the most financially devastating forms of malware in existence today. It infiltrates a victim’s computer, encrypts their data, and renders it completely inaccessible. The attackers then demand a ransom – typically in cryptocurrency – in exchange for the decryption key. If payment is refused, they may threaten to publish or permanently delete the files.

The scale of this threat is staggering. The average ransom payment reached $2.73 million in 2024, a dramatic increase from $400,000 in 2023. Ransomware no longer targets only large corporations – in 2024 alone, ransomware attacks surged by over 70%, with hackers increasingly targeting education, healthcare, government, and small to mid-sized businesses.

How ransomware spreads

Ransomware commonly enters systems through phishing emails with malicious attachments, compromised websites, or unpatched software vulnerabilities. Once inside, it can spread rapidly across a network, encrypting files within minutes. What makes modern ransomware even more dangerous is that many variants act as a timebomb – waiting before being activated, a strategy designed specifically to knock out backup systems.

Why regular backups are your best defence

While antivirus tools can help prevent ransomware from entering your system, they cannot guarantee complete protection. This is why data backup is considered the best way to protect yourself against ransomware. If you have a clean, unaffected backup when an attack strikes, you can restore your files without paying a cent in ransom.

The most widely recommended backup approach is the 3-2-1 rule: keep three copies of your data, stored on two different media types, with one copy kept offsite or offline. It is unlikely that a ransomware actor will be able to access a properly protected offsite storage facility, whether that is a cloud backup service or a physically separate location.

Critically, 96% of ransomware attacks now target backups, because without them, recovery is off the table. This means your backups themselves must be protected. Consider these steps:

Use offline or air-gapped backups: Offline backups stored on tape or isolated networks are immune to network-based ransomware attacks.
Automate your backups: At minimum, schedule daily backups so recent data is always protected.
Test your backups regularly: A backup you have never tested may not work when you need it most.
Keep backups encrypted: Whether stored on-premises or in the cloud, backup data should always be encrypted.

Secure browsing practices

Your web browser is one of the most common gateways hackers use to compromise a computer. Threat actors often use web browsers to spread malware since people rely on them heavily for internet access. Practicing secure browsing habits significantly reduces your exposure to these threats.

Always use HTTPS websites

The single most important browsing habit is checking for HTTPS before entering any information on a website. The CISA recommends changing your browser settings to only allow HTTPS connections, which will prevent your browser from connecting to an unsecure HTTP site and warn you before proceeding. The padlock icon in your browser’s address bar indicates an encrypted, secure connection.

Be vigilant about fake websites too. Phishing campaigns often use URLs that closely mirror legitimate websites but contain slight misspellings – for example, using “cesa.gov” instead of “cisa.gov” or swapping a domain extension. Always double-check the URL before entering a password or payment detail.

Keep your browser updated and clean

An outdated browser is a vulnerable one. You should keep your browser up to date with the latest security patches, enable automatic updates if available, and restart your browser regularly to allow updates to take effect. Additionally, blocking third-party cookies and clearing stored cookies periodically limits the amount of personal data third parties – and potential attackers – can gather from your browsing activity.

Think before you click

More than 90% of successful cyber-attacks start with a phishing email. Suspicious links, unexpected attachments, and urgent requests to “verify your account” are all hallmarks of phishing attempts. If a link looks unfamiliar or a message seems out of the ordinary – even from someone you know – don’t click it without verifying first.

Use strong passwords and multi-factor authentication

Weak passwords remain one of the easiest ways for hackers to gain access to accounts. CISA recommends using strong, unique passwords and a password manager to generate and store them, along with enabling multi-factor authentication (MFA) – which makes it significantly less likely that you will get hacked even if your password is compromised. Enable MFA starting with your email account, then financial accounts, and then social media.

Be cautious on public Wi-Fi

Public Wi-Fi networks at coffee shops, airports, or libraries are often unsecured. When using wireless networks, only send personal information through websites with HTTPS encryption or a secure Wi-Fi network – and avoid accessing sensitive accounts like online banking over public hotspots altogether. Using a Virtual Private Network (VPN) adds an additional layer of encryption when connecting through public networks.

Putting it all together

Preventing hacking is not about any single tool – it is about building layers of protection. Keeping your antivirus software updated addresses malware and spyware. Maintaining regular, offline backups gives you a recovery path if ransomware strikes. Practicing safe browsing habits reduces the chance of an attack ever reaching your system in the first place. Each layer strengthens the others, and together they form a reliable defence against the most common online threats.

What do you think? Given that over 90% of cyberattacks begin with a phishing email, how prepared are you to identify a convincing phishing attempt in your inbox? And when did you last check whether your important files are backed up and recoverable?

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Table of Contents

Understanding spyware and malware 🔗

How malware and spyware infect your computer 🔗

Signs your computer may be infected 🔗

The role of antivirus and anti-spyware programs 🔗

Ransomware threats 🔗

How ransomware spreads 🔗

Why regular backups are your best defence 🔗

Secure browsing practices 🔗

Always use HTTPS websites 🔗

Keep your browser updated and clean 🔗

Think before you click 🔗

Use strong passwords and multi-factor authentication 🔗

Be cautious on public Wi-Fi 🔗

Putting it all together 🔗