How to prevent malware: 10 security tips to protect your identity

Malware — short for malicious software — is designed to harm your device, disrupt its operation, or steal your data. It often spreads through scams, phishing links, malicious attachments, and fake downloads. Once installed, malware can capture passwords, personal information, and other sensitive data that criminals may use for identity theft, financial fraud, or account takeovers.

And the threat is widespread. According to its Q4 2025 Threat Report, Gen Digital — the company behind LifeLock — blocked 1.43 billion attacks in the final quarter of 2025 alone.

To help you keep your devices and data better protected, here’s a deep dive on how to prevent malware by combining cutting-edge security tools with smart Cyber Safety habits.

1. Avoid suspicious links

Suspicious links containing spelling mistakes or odd character strings may lead somewhere different from where they appear to direct. They’re commonly used in phishing scams to take you to fake login pages, malicious websites, or harmful downloads.

Scammers often disguise these links as legitimate URLs or place them behind convincing buttons and text. Clicking one could take you to a site designed to steal your passwords, payment details, or other sensitive information. It may also prompt you to download malware disguised as a legitimate file or app.

In some cases, malicious or compromised websites can exploit unpatched software vulnerabilities to infect a device with minimal additional interaction. Keeping your browser and operating system updated can help protect against these attacks, but checking links before opening them provides another important layer of protection.

2. Watch out for malicious attachments

Malicious attachments are harmful files disguised as legitimate documents, such as invoices, shipping receipts, or healthcare records. They often arrive through phishing emails designed to create urgency and pressure you into to trick you into opening them. Once opened, an attachment may run malicious code that installs malware such as keyloggers or Trojans directly onto your device.

Cybercriminals may use compressed files, executable files, or documents containing malicious macros or scripts to evade detection. Because these files can appear to come from trusted sources or even known contacts whose accounts have been compromised, always treat unexpected files with caution.

3. Monitor where your personal information appears online

Cybercriminals can find or purchase stolen personal data on the dark web, a part of the internet that requires specialized software to access. If information such as your email address, phone number, or login credentials is exposed in a data breach, scammers may use it to create more targeted attacks.

Using real details can make phishing messages appear more convincing. For example, scammers may impersonate a healthcare provider or financial institution and include malicious links or attachments designed to install infostealer malware. Monitoring your digital footprint can help you identify exposed information sooner and take steps to secure affected accounts.

4. Only download software from trusted sources

Downloading software from official app stores and verified developer websites reduces the risk of installing programs that have been altered to contain malware. Unofficial download sites and peer-to-peer networks may distribute repackaged versions of legitimate software bundled with spyware, adware, Trojans, or other unwanted programs.

Some malicious downloads may even appear to work as expected while secretly installing additional software that monitors your activity, captures keystrokes, or collects browsing data. Sticking to official sources helps reduce the risk of downloading tampered or malicious software.

5. Keep devices updated

Malware often targets outdated operating systems, browsers, and apps, so keeping your software current is one of the simplest ways to strengthen your device’s security.

Software developers regularly release security patches to fix vulnerabilities that attackers could exploit to inject malware into your system. Delaying updates can leave known security flaws unpatched, increasing your exposure to attacks. Enabling automatic updates helps close these gaps by installing important fixes as soon as they become available.

6. Use security software

Security software adds an important layer of protection by monitoring your device for malware and other suspicious activity. While built-in operating system protections can block many threats, dedicated security software can provide additional defenses designed to identify malicious files, unsafe downloads, suspicious programs, and potentially dangerous behavior.

The best antivirus programs work continuously in the background, providing real-time protection by scanning files and programs as you access them. Depending on the software, it may also help block malicious websites, detect phishing attempts, identify ransomware, and flag suspicious activity before it can compromise your device or data.

7. Watch out for pop-ups 

Malicious pop-ups are a phishing tactic designed to scare or pressure you into taking an unsafe action. They may imitate antivirus warnings, claim your device is infected, or display urgent messages telling you to scan your system, renew security software, or call a support number.

These scam pop-ups don’t necessarily mean your device is already infected. Instead, scammers use urgency and fear to persuade you to click a link, download fake security software, provide personal information, or contact a fraudulent support service. Some pop-ups may also redirect you to malicious websites where attackers attempt to install malware or steal your login credentials.

8. Use a firewall

A firewall helps protect your device by monitoring network traffic and controlling which connections are allowed. It acts as a barrier between your device and other networks, blocking unauthorized incoming connections that could expose your system to attackers or malware.

Firewalls are particularly useful for limiting threats that spread across networks. For example, some worms can automatically search for vulnerable devices and exploit exposed network services without requiring you to click a malicious link or download a file. A firewall can reduce this risk by preventing unwanted connections from reaching your device.

Most modern operating systems include a built-in firewall, and home routers typically provide firewall protections for devices connected to your network. However, a firewall is only one part of a layered security strategy: It won’t necessarily stop malware you download yourself or protect you from phishing and other social engineering attacks.

9. Practice strong password hygiene

Weak or reused passwords can make it easier for attackers to gain unauthorized access to your accounts. If criminals obtain your credentials through phishing, a data breach, or password-cracking attacks, they may be able to access sensitive information, impersonate you, or use a compromised account to target your contacts with scams or malware.

Strong password security starts with using a unique password for every account. Reusing passwords is particularly risky because credentials exposed in one breach can be tested automatically against other services in a technique known as credential stuffing. If the same password works elsewhere, a single compromised account can quickly lead to several.

Long, unique passwords also make password-guessing attacks more difficult. Rather than trying to create and remember them yourself, use a password manager to generate and securely store credentials for each account.

10. Use a secure Wi-Fi network

Unsecured Wi-Fi networks, such as public hotspots in coffee shops or airports, can increase your exposure to malware and other security risks. These open networks often lack encryption provided by robust Wi-Fi security protocols, which can give attackers more opportunities to target connected devices.

Once positioned between you and your connection, attackers may attempt to intercept or manipulate the data you send and receive, redirecting you to malicious websites or injecting malware directly into your active web session. They may also target vulnerable services on your device or create convincing fake hotspots designed to capture your traffic.

How malware can lead to identity theft

Sometimes, malware attacks are isolated incidents — other times, they can give identity thieves access to the personal information they need to impersonate you. Infostealers, for example, can extract saved passwords, browser cookies, and autofill data, while keyloggers can record what you type, potentially exposing login credentials, financial information, and other sensitive data.

Criminals can then use stolen information to take over accounts, commit financial or tax fraud, or sell the data on dark web marketplaces. And the consequences can persist long after the malware is removed, as stolen data may be used repeatedly for account takeovers, financial fraud, identity theft, or targeted scams.

Large-scale cyberattacks demonstrate how stolen credentials and data breaches can create identity theft risks. In the 2024 Change Healthcare cyberattack, attackers reportedly used compromised credentials to access company systems, causing widespread disruption and exposing sensitive personal and health information belonging to 192.7 million people.

Signs your device is infected with malware

Malware can sometimes slip past your defenses and operate unnoticed in the background. Recognizing potential warning signs can help you investigate sooner and reduce the risk of data theft, fraud, or further damage.

Some things to look out for include:

• Slower performance: Malware running in the background can consume processing power, memory, or network resources, causing unexpected slowdowns.
• Frequent pop-ups: An unusual increase in ads, alerts, or fake system warnings can indicate adware or other unwanted software.
• Unknown apps or programs: Software you don’t remember installing may be a sign that malware or a potentially unwanted program has reached your device.
• Unexpected browser changes: Malware or unwanted extensions can change your homepage, default search engine, or other browser settings without permission.
• Unwanted redirects: If your browser repeatedly sends you to unfamiliar websites, adware or a malicious extension could be interfering with your browsing.
• Frequent crashes or freezes: Some malware can interfere with normal system processes, causing instability, although hardware and software problems can produce similar symptoms.
• Unusual battery drain: Malicious processes running continuously in the background can increase power consumption and cause your battery to drain faster than normal.

What to do if you think you downloaded malware

If you think you downloaded malware, don’t panic — downloading a suspicious file doesn’t necessarily mean your device is infected. But if you opened the file, installed something, or notice signs of malware, acting quickly can help limit the potential damage.

Here are the steps to take:

1. Disconnect from the internet: If you suspect an active infection, turn off Wi-Fi or disconnect Ethernet to help prevent malware from communicating with attackers, downloading additional threats, or transmitting your data.
2. Run a malware scan: Use trusted security software to perform a full system scan. Quarantine or remove confirmed threats and restart your device if prompted.
3. Update your device: Once the malware has been removed, install the latest operating system, browser, and software updates to patch vulnerabilities that attackers could exploit.
4. Change important passwords: If you think your credentials may have been exposed, use a clean device to change passwords for sensitive accounts, starting with your email, financial, and other high-value accounts. Enable multi-factor authentication where available.
5. Monitor your accounts: Check financial and online accounts for unauthorized transactions, unfamiliar logins, password resets, or other suspicious activity.
6. Watch for identity theft: Look for warning signs such as unfamiliar accounts, credit applications, bills, or changes to your credit report that you didn’t authorize.
7. Consider identity theft protection: A service like LifeLock can monitor for certain signs of identity misuse and provide restoration support if your identity is stolen.

Help protect your identity if your information is exposed

When malware exposes passwords or other personal information, securing your device is only the first step. To help head off identity theft, it’s important to keep a lookout for signs that your stolen data is being misused.

LifeLock helps you stay ahead with dark web monitoring, breach alerts, and notifications about certain suspicious activity. And if identity theft occurs, U.S.-based restoration specialists can help guide you through the recovery process.

FAQs

Can malware steal your identity?

Yes, malware can steal personal information that criminals may use for identity theft. Infostealers and keyloggers can capture login credentials, financial details, and other sensitive data from your device. Criminals may then use that information to take over accounts, commit financial fraud, impersonate you, or carry out other forms of identity theft.

How do I know if malware stole my information?

Warning signs that malware stole your information include noticing unfamiliar logins, password-reset requests, suspicious account activity, or unexpected financial transactions. Even if you detect and remove malware, sensitive data exfiltration isn’t always obvious until downstream identity theft impacts become apparent.

What are the most common types of malware?

Common types of malware include viruses that infect files, ransomware that encrypts data and demands payment, and spyware that secretly monitors activity or steals information. Other threats include Trojans, which disguise themselves as legitimate software, and worms, which can spread automatically across devices and networks.