ICT 351 Lecture 4: Viruses and Malware
21 Jan 2019
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Document Summary
Enters a computer system without user"s knowledge, then performs an. Two types of malware with the goal of spreading. Malicious computer code that reproduces itself on the same computer. A virus attaches itself to a computer file. Virus appends itself to end of a file. Moves first three bytes of an original file to the virus code. Replaces them with a jump instruction pointing to the virus code. Original code transferred and stored inside virus code. Host code executes properly after the infection. Parts placed at random positions in a host program. Head of virus code starts at beginning of the file. Gives control to next piece of virus code. The virus replicates itself by spreading to another file. Erase files from or reformat a hard drive. Viruses can only replicate itself on the host. A means to transport it to other hosts. Drawback of antivirus software is that it must be updated to recognize new viruses.
