TAILIEUCHUNG - Viruses Worms

A computer virus is a computer program that can copy itself and infect a computer without permission or knowledge of the user. “a program that replicates by “infecting” other programs, so that they contain a copy of the virus” | Viruses & Worms CS431 Dick Steflik A Couple of Definitions: A computer virus is a computer program that can copy itself and infect a computer without permission or knowledge of the user. “a program that replicates by “infecting” other programs, so that they contain a copy of the virus” How Viral code is attached or “inserted” into the order of execution so that when the legitimate code is run the viral code is also run or run instead of the legitimate code. May be “tacked” on to the end of an executable file or inserted into unused program space. Legitimate code must be modified so that the viral code is branched/vectored to. Most viruses: Do not damage the original program or damage the hardware May damage data files “trash” firmware Mess up boot records But, some do For this reason most can be cleaned up with anti-virus software. The Normal Virus works like this: User call for a legitimate program The virus code, having inserted itself in the order of execution, executes instead or

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