PLS 21 Lecture 12: PLS Lect 12
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PLS 21 Full Course Notes
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Document Summary
In past, pcs were mainly under threat from viruses and worms. Main purpose of these programs was to spread; however, some programs were also designed to cause damage to files and pcs. Such malicious software, or malware could be described as cyber vandalism. In the majority of cases, the goal of viruses and worms was to spread as much as possible, with a high infection rate leading to fame for that program: situation has changed dramatically, biggest threat today is crimeware. This is written by cyber criminals with the purpose of making money illegally. May take the form of viruses, worms, trojans or others. Adware is often built into freeware or shareware programs: if you download a freeware program, the adware is installed on your system without your knowledge or consent. Sometimes a trojan will secretly download an adware program from a website and install it on your computer: web browsers that aren"t up-to-date often contain vulnerabilities.
