Computer Virus and its Types (Mob View)
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A computer virus is a self-replicating program that can damage data, degrade system performance, and steal information. There are various types of viruses categorized by their behavior, including boot sector, file, macro, and multipartite viruses, each with specific methods of infection and examples. Notable examples include the stoned virus (boot sector), cascade (file), melissa (macro), and ghostball (multipartite).
Computer Virus and its Types (Mob View)
- 2. VIRUS Full form: Vital Information Resources Under Seize. A computer virus is a program that reproduces itself. It may be attached to other programs, or it may create copies of itself. It may damage or corrupt data, change data, or degrade the performance of your system by utilising resources such as memory or disk space. It can also hack your computer system and share the information with the hacker's systems. A computer virus may be categorised as:
- 3. Boot Sector Virus Boot sector virus infects the computer by copying the code to the boot sector. It replaces the valid contents with its own infected version. When the computer starts, the virus is loaded into the computer memory. Then it easily infects the disks. Example: Parity Boot, which displays the message PARITY CHECK and freezes the operating system. Other examples include, Disk Killer, Stoned virus.
- 4. File Virus File Virus infects the files on the computer system. It resides in the root of a host file and then begins its operation when the file is executed. When the file is opened, it overwrites the file. It can also infect files with .exe, .com,.sys file extensions. Example: Sunday, Cascade.
- 5. Macro Virus Macro Virus infects Microsoft Word or Microsoft applications that provide support for Macros Whenever the application runs, the virus gets activated and damages the formatting of the document. Since these files are sent through mails, a computer network can be easily infected by these viruses They are relatively harmless. Example: Melissa, W97M.
- 6. Multipartite Virus Multipartite Virus is called a multi-part virus or hybrid virus. It infects computer systems multiple times and at different times. It can infect both program files and boot sectors, thus causing more damage than any other kind of virus. To eradicate the entire virus, it must be removed from the system. Example: The first multipartite virus was the Ghostball virus and was discovered in 1989 by Fridrik Skulason.