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These programs are infections, first and foremost. These programs exploit security weakness, and use or even install other infections on your computer.
Rogue security software mainly relies on social engineering in order to defeat the security built into modern operating system and browser software and install itself onto victims' computers.
Most have a Trojan horse component, which users are misled into installing. The Trojan may be disguised as:
* A browser plug-in or extension
* An image, screensaver or archive file attached to an e-mail message
* Multimedia codec required to play a certain video clip
* Software shared on peer-to-peer networks
* A free online malware scanning service
Some rogue security software, however, propagate onto users computers as drive-by downloads which exploit security vulnerabilities in web browsers or e-mail clients to install themselves without any manual interaction.
Remember that it is entirely possible that once you get one of these computer infections, there are other system infections that may be running in conjunction with the one that you find.
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