A computer virus is a program designed to harm or cause on an infected computers. Its spread through e_mail attachment, portables device, website containing malicious script and file download. A virus program contains instruction to initiate some sort of event that affects can range from harmless to devastating. A computer virus attaches itself to the host files and always activate wherever you open the infected files. The virus can replicate itself and then infect the other file on your computer causing more damage. Below is a list of different types of computer viruses and what they do:
- Macro viruses
- Memory Resident Viruses
- Overwrite viruses
- Direct Action viruses
- Directory virus
- Web scripting virus
- Multipartite Virus
- FAT virus
- Companion virus
- Polymorphic virus
1. Macro viruses
These viruses infect the files created using some program that contain macros such as doc, pps, xls and mdb. They automatically infect the files with macros and also template and documents that are contained in the file. They hide in documents shared through email and network. Macro viruses include : relax, bablas, melissa. A, 097M/Y2K
2. Memory Resident viruses
They usually fix themselves inside the computers memory. They get activated every time the OS runs and end up infecting other opened file. The hide in RAM. Memory resident viruses include : CMj, meve, randex, mrklunky
3. Overwrite viruses
These types of viruses delete any information in a file they infect, leaving them partially or completely useless once they are infected. Once in the computer, they replaces all the file content but the file size doesn’t change. Overwrite viruses include : Trj. Reboot, way, trivial. 88D
4. Directory virus
Also known as cluster virus or file system virus. They infect the computer directory by changing the path indicating file location. They are usually located in the disk but affects the entire directory. Directory’s viruses include : dir_2 virus.
5. Web scripting virus
Most web page include some complex codes in order to create an interactive and interesting contents. Such a code is often exploited to cause certain undesirable action. They mostly origniate from the infected web page or browser. Web scripting virus include : JS. Fortnight a virus that spreads via malicious emails.
6. Multipartite virus
These types of viruses spread in many different ways. Their action vary depending on the OS installed and presence of certain files. They tend to hide in the computer memeory but do not infect the hard disk. Multipartite virus include : flip, invader, tequila.
7. FAT viruses
These lardy viruses attacks the file allocations table (FAT) which is the disc part used to store every information’s about the space location of files unusable space etc. FAT viruses include : the link virus.
8. Companion viruses
These type of virus infect files just like the direct action and the resident type. Once inside the computers they accompany other existing files. Companion viruses include : asimov. 1539,stator and terrax. 1069
9. Polymorphic virus
They incode or encrypt themselves in a different way every time they infect your computer. They use different encryption and algorithms. This makes it difficult for the antivirus software to located them using signature or string search (since they are very different in each encryption). Polymorphic viruses include : marbug, tuareg, satan bug, elkern
This program is very similar to a virus and has the ability to self-replicate leading to negative affects on your computer worm viruses include : lovagte.F, SOBIG.D, trile.
11. Direct action viruses
These virus mainly replicate or take action once they are executed when a certain conditions is methttps://wp.me/pawmDN-fI the viruses will aft by infecting the files in the directory’s or the folder specified in the AUTOEXE. BAT. The v virus generally foun in the hard disk root directory, but they keep on changing. Direct action viruses include : vienna virus
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