Recognizing and Removing Adware and Malware

What Is Adware?

Adware is software that automatically displays or downloads advertisements — usually without your meaningful consent. While some adware is merely annoying, malicious adware can:

• Track your browsing behavior and collect personal data
• Redirect your browser to malicious websites
• Serve ads containing malware (malvertising)
• Slow your device significantly
• Bundle with spyware that monitors your keystrokes and activity

Signs Your Device May Have Adware or Malware

• Browser homepage has changed without your permission
• Excessive pop-up ads, even on sites that don’t normally show them
• New browser toolbars or extensions you didn’t install
• Browser redirects to unexpected websites
• Device is noticeably slower than usual
• Programs you didn’t install have appeared
• Your antivirus has been disabled
• Unusual battery drain or data usage on mobile devices
• Your contacts receive messages you didn’t send

Types of Malware

• Virus: Attaches itself to legitimate programs and spreads when those programs run.
• Trojan: Disguises itself as legitimate software. Once installed, opens a backdoor for attackers.
• Spyware: Secretly monitors your activity and sends data to criminals — including keystrokes (passwords), screenshots, and browsing history.
• Keylogger: Records every keystroke you type — capturing passwords, messages, and credit card numbers.
• Rootkit: Deeply embeds itself in your system to hide malware from detection tools.
• Worm: Self-replicating malware that spreads across networks without user action.
• Cryptojacker: Uses your device’s processing power to mine cryptocurrency for criminals — causing slowdowns and hardware wear.
• Infostealer: Specifically designed to harvest credentials, cookies, and personal data from your browser and send them to attackers. Infostealers are currently one of the most prevalent malware types.

How Malware Is Delivered

• Software bundling: Free software that “bundles” adware or malware during installation. Always choose “Custom Install” and deselect bundled extras.
• Fake updates: “Your Flash Player is out of date!” pop-ups that deliver malware instead of updates.
• Cracked software and pirated content: A primary distribution channel for malware.
• Malicious browser extensions: Extensions that claim to offer useful features but harvest your data.
• Drive-by downloads: Visiting a compromised website automatically downloads malware.
• Infected USB drives: Connecting unknown USB devices.

Protecting Yourself from Malware

• Use reputable antivirus software and keep it updated (Windows Defender, Malwarebytes, Bitdefender).
• Only download software from official sources and developer websites.
• Avoid pirated content — the “free” version often costs you your security.
• Review browser extensions — remove any you don’t recognize or no longer need.
• Keep your operating system and software updated — patches close security holes malware exploits.
• Run Malwarebytes (free version) periodically as a second-opinion scanner.
• On mobile: only install apps from the official App Store or Google Play, and review app permissions carefully.

Browser Security Best Practices

• Use a modern browser: Chrome, Firefox, Edge, and Safari receive frequent security updates.
• Use an ad blocker: uBlock Origin (free, open source) blocks ads and malvertising. This is one of the most impactful security tools for everyday browsing.
• Check for HTTPS: Look for the padlock icon in the address bar. While HTTPS doesn’t guarantee a site is legitimate, it does mean your connection is encrypted. Avoid entering any sensitive information on HTTP sites.
• Be suspicious of browser notifications: Be selective about which sites you allow to send browser notifications. Malicious sites use these to display fake alerts.
• Use DNS filtering: Services like Cloudflare’s 1.1.1.1 or NextDNS can block known malicious domains before your browser even connects to them.