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Malware

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Submitted By BlakeyB
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Malware
1. Trojan Horses
For a malicious program to accomplish its goals, it must be able to run without being detected, shut down, or deleted. When a malicious program is disguised as something normal or desirable, users may unwittingly install it. This is the technique of the Trojan horse or Trojan. In broad terms, a Trojan horse is any program that invites the user to run it, concealing harmful or malicious executable code of any description. The code may take effect immediately and can lead to many undesirable effects, such as encrypting the user's files or downloading and implementing further malicious functionality.
2. Rootkits
Once a malicious program is installed on a system, it is essential that it stays concealed, to avoid detection. Software packages known as rootkits allow this concealment, by modifying the host's operating system so that the malware is hidden from the user. Rootkits can prevent a malicious process from being visible in the system's list of processes, or keep its files from being read. Some malicious programs contain routines to defend against removal, not merely to hide them.
3. Adware
Adware is a form of malware which presents unwanted advertisements to the user of a computer. The advertisements produced by adware are sometimes in the form of a pop-up. While some sources rate adware only as an "irritant" others classify it as an "online threat" or even rate it as seriously as computer viruses and Trojans. The precise definition of the term in this context also varies. Adware that observes the computer user's activities without their consent and reports it to the software's author is called spyware. In addition, almost all commercial antivirus software currently detect adware and spyware, or offer a separate spyware detection...

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