Computer Virus What is a computer Virus? • Is a computer program that can copy itself and infect a computer. • A true virus can spread from one computer to another (in some form of executable code) when its host is taken to the target computer Why do people create computer viruses? • To gain control of or hack a computer and use it for specific tasks. • To generate money by using such malware as a cash machine • To steal sensitive information (credit card numbers, passwords, personal details, data, etc.,) • To prove that they are capable of writing a virus. • For revenge against a company • To cripple a computer or network Propagation tricks • LAN Connection • Internet Connection • Flash drive • Floppy disk • CD (compact disc) • DVD (digital video disc) Kinds of Viruses • General Viruses • Email Viruses • Trojans • Worms Four types of viruses that spread to the system • Program – this type is executed from within specific application programs. • Boot sector- this type enters your system through a floppy disc or any removable media and then infects the hard drive. • Macro – this type is written specifically for macro applications on your computer like Microsoft Word, Excel and Outlook • Email – this type spreads through email attachments Virus Symptoms • Computer Runs Slowly • Random Restarts • Anti-viral Software disabled • Printing errors • Attachment Extensions Anti-Virus Software • Anti-Virus Software is used to prevent, detect and remove malware, including computer viruses, worms and Trojans. Anti-Virus Measure • Preparation – includes making backups of all software (including operating systems) and making a contingency plan. • Prevention – includes creating awareness, implementing hygiene rules, using authorization software, or providing isolated ‘quarantine’ PCs. • Detection – involves the use of anti-virus software to detect, report and (sometimes) disinfect viruses. • Containment – involves identifying and isolating the infected items. • Recovery – involves disinfecting or removing infected items, and recovering or replacing corrupted data.
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