Malware
Browser Hijacker
Also known as: Search hijacker, Homepage hijacker
Definition
Software that alters browser settings without user consent to redirect traffic, change the homepage and search engine, or inject unwanted ads.
Examples
- Extensions that change the default search engine to a low-quality ad-driven service.
- Bundled toolbars that redirect new tabs and inject sponsored links into search results.
Related terms
Adware
Software that automatically displays, injects, or redirects to advertisements, often bundled with free software and frequently tracking user behavior.
Potentially Unwanted Program (PUP)
Software that is not strictly malicious but installs without clear consent, behaves intrusively, or degrades user experience — for example, bundled toolbars, adware, or aggressive optimizers.
Spyware
Malware that secretly collects information about a user, device, or organization and sends it to an external party.
Trackware
Software that monitors and reports on user activity — sites visited, apps used, keystrokes, or location — typically for advertising, analytics, or stalking.
Malvertising
The use of online advertising networks to distribute malware, exploits, or scams via legitimate-looking ads served on trusted websites.
Greyware
Software that sits in a grey area between legitimate and malicious — annoying, intrusive, or risky, but not clearly designed to harm the user.