When someone from the non-technical field sees this article title about computer viruses and its types may think that the term virus may be something which causes diseases in human being. They are definitely correct up to a certain extent that computer viruses also cause diseases, but not for humans.
Definition of Computer Virus
Sometimes a computer virus is more dangerous than a bio-virus. It is nothing more than a program coded for malpractice that can interrupt a computer system’s ordinary functioning.
These viruses can infect the host computer and in multiple harmful ways alter its workings.
They can steal information, delete or alter documents and files, steal or harm hard disk spaces, or cause a software program to work in an unwanted way.
Other damaging activities of these viruses include attaching to disk files, email attachments, USBs, and hard drives. These computer viruses can slow down the processing of your CPU overall.
The computer virus replicates itself by changing computer programs and is transmitted to other PCs and devices by transferring infected files, emails, disks, and USBs.Once these are opened on another device, they get infected too – unless there is already installed a powerful and updated antivirus program.
Every year, these malicious computer viruses cause considerable financial harm directly or indirectly by corrupting information, causing system failure and rising maintenance costs.
Computer Viruses And Its Types.
Here we are trying to define Computer Viruses And Its Types based on the target of their attack. This article does not cover all types of computer viruses.
Following are the common types of viruses on computer.
Boot Sector Virus
This sort of virus is connected to the boot storage and will begin functioning whenever you put it on your machine. This virus mainly affects floppy disks. Although they are not very prevalent today, other computer units, particularly the obsolete ones, are still caused. Polyboot. B and AntiEXE are some examples.
This hijacker virus can take over your browser and is linked to free downloads and attractive toolbars and programs. Moreover, the browser hijacker will open numerous fake websites that can damage your computer when you type a web address in your internet browser. On the other side, to keep them ahead, most trusted browsers have built-in security to fight against these type of viruses.
Direct Action Virus
This sort of virus becomes active only when the infected file or program is running. Direct action viruses attack file types, with extensions .exe and.com. This virus primary aim is to reproduce and infect documents in folders. They typically do not delete files or impact working efficiency and speed of the PC This virus can be detected by most anti-virus software.
These Viruses alter the path of files. The virus program also operates in the background when you run programs infected with directory viruses. Furthermore, once infected with file viruses, it may be hard for you to find the initial application or software.
This sort of virus utilizes malicious encrypted codes that make it difficult to detect antivirus software. Only when they decrypt themselves during replication can they be identified. Although files or folders are not deleted, they can have a serious impact on PC efficiency.
File Infector Virus
This is one of the most prevalent types of computer viruses kinds that attaches to documents and ultimately can take over the file, totally corrupting it. This virus also infects files or programs that can be executed. The file infector virus is also triggered when you run these programs, which can slow down the program and generate other harmful impacts. This category belongs to a big block of current viruses.
Memory Resident Virus
This sort of virus corrupts the memory of the computer and can delete documents in order to generate room for itself. Resident viruses live in your system’s RAM. It can interfere with the ordinary operation of the system that can lead to file and program corruption. CMJ, Meve, MrKlunky, and Randex are the most common instances of resident viruses.
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This virus attaches macro supporting documents like Microsoft Excel or Word. These viruses can perform a sequence of activities that affect program or software efficiency. O97M / Y2 K, Bablas, Melissa. A, and Relax are some examples of macro viruses. As email attachments, you may accidentally download them to your computer.
This is one of the most difficult viruses to cope with as it spreads various damaging activities in several ways. It can spread in a rapid manner, performing in your operating system, folders, and other computer programs through unlawful activities. They can infect the executable files as well as the boot area.
This sort of virus basically spreads through the Local Network Area (LAN) and the internet. These viruses reproduce through shared drives and files.
This virus overwrites a file’s content and causes the loss of the original content. It infects folders, files, and programs as well. You also need to get rid of your file to remove this virus. Therefore, the backup of your system files is essential.
As they encrypt and alter their coding, they are very hard to identify, making it difficult to pick up your antivirus software. They can also readily replicate. Satan Bug, Elkern, Tuareg and Marburg are among the polymorphic viruses.
Web Scripting Virus
In our list of computer viruses and its types, not the least but the last is Web scripting Virus. Unknown to you, a website may host malicious viruses added with a bad intent by a third party. These type of viruses inserted in some links, advertisements, images, videos, and website design itself. These can hold malicious codes that will automatically download the viruses or direct you to malicious websites when you click on them. Pay attention to the websites that you visit.
Install the latest industry-leading antivirus software to maintain your device secure from computer viruses.