TROJAN
Trojans or Trojan Horses are programs that appear to be innocuous even beneficial, but in fact, are harmful!. Much like the historical trojan horse, these programs appear favorable to you but in reality make your system more vulnerable to attacks and malware. The harmful contents could be anything from a virus to a remote pc or server. Trojans are designed to cause loss or theft of data, and or system destruction. Trojans can be distributed as email attachments, or bundled with other software programs.
HIJACKER
Hijackers are applications that attempt to take control of the user's home page or search function and reset it with the site of the hijacker's settings. This site is almost always loaded with ads, pop-ups, and/or other make-money-fast portals. Many use stealth techniques or misleading dialogue boxes to perform installation. Hijacker programs will put a reference to themselves in the StartUp or Registry, so that the software reinstalls itself every time the computer is started. If the user tries to change any of these settings, the hijacker then changes them back upon reboot.
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