A   B   C   D   E   F   H   I   K   M   O   P   R   S   T   U   V   W   Z   

H

Heuristics

A way to determining that a file might be infected due to several virus-like conditions being met. These are called heuristic flags. When certain flags or combinations of flags are set (the file is "flagged"), it is decided that the file is infected.

Hijacker

Often installing as a helpful browser toolbar, hijackers may alter browser settings or change the default home page to point to some other site.

Hijacker, Browser Hijacker

A program which sets your browser settings (such as home page, search page, etc.) to other sites without your permission.

HOSTs file

A file which contains hardcoded IP addresses for domain names. Commonly exploited by malware to keep users from reaching certain sites.