What is a virus?
A computer virus, much like an influenza virus, has the capacity to propagate and reproduce itself from host to host. Similarly, computer viruses can’t be reproduced and spread without programming like a file or a paper, as flu viruses can’t replicate without a host cell.
More technically speaking, a computer virus is a sort of harmful code or software designed to disrupt the functioning of a computer and propagate it from one computer to another. A virus works by injecting or connecting to a legal application or document to enable the execution of its code using macros. In the course of doing so, a virus might produce unanticipated or harmful consequences, such as corruption or destruction of data, on system software.
Viruses are generally duplication-capable programs that inflict harm, such system corruption or data destruction. Viruses of many kinds exist:
Worm is an independent software program that duplicates itself and spreads to other computers through network depending on the network security.
Trojan Horse is a type of malware that often looks like a legal software through which the hackers access the user’s systems.
Adware is the type of virus which downloads various applications in a user’s system without the user’s knowledge.
Viruses infect the system and result in slow performance, data loss and system crashes.
What is antivirus and why do we need it?
Anti-viruses are used to guard against viruses. Software that is antiviral is a tool that aims at preventing, searching, detecting and removing software viruses and other malware, such as worms, trojan horses, adware, and so on.
Viruses are developed to harm the equipment of the user, deprive a user of data access, or control the computer of the user. An antivirus has thus been designed to safeguard the system. Antivirus Software will check for any malware or malware patterns in particular files and folders. It also allows users to automatically schedule scans and at any moment start scans of a particular file or device and informs users of any dangerous file or code. Users should ensure that antivirus protection software is up to date and that they are more likely to stay safe from cyber criminals.
How does a computer virus attack?
Once a virus has been attached to a program, file or document successfully, the infection will remain dormant until the computer or device exercises its code under circumstances. To infect a virus, you need to start the infected application which in turn leads to the execution of the viral code.
This implies a virus might sleep without exhibiting any significant indications or symptoms on your computer. However, the virus can infect other computers on the same network once the infection has infected your computer. Could you steal your passwords or data, track the keystrokes, damage your files, spambots your email connections and even get your computer over?
Although certain viruses can be played intentionally and effectively, others may cause deep and harmful consequences. This includes data deletion or irreversible damage to your hard drive. Worse still, some infections have financial gains.
How do computer viruses spread?
In a society that is continuously linked, a computer virus may be contracted in various ways, with some becoming more visible. It is possible to transmit viruses through email and text message attachments, download of Internet files, and social media fraud links. You can get mobile viruses infected via dodgy app downloads on your mobile devices and smartphones. Viruses may hide as socially shared material attachments such as humorous pictures, greeting cards, or audio and video files.
It is necessary to be precautionary when you surf the Web, download files, and click links or attachments to avoid interaction with a virus. Do not download text or email attachments, or files from online pages you don’t trust, to help you remain safe.
What are the signs of a computer virus?
A computer virus attack can produce a variety of symptoms. Here are some of them:
- Frequent pop-up windows. Pop-ups might encourage you to visit unusual sites. Or they might prod you to download antivirus or other software programs.
- Changes to your homepage. Your usual homepage may change to another website, for instance. Plus, you may be unable to reset it.
- Mass emails being sent from your email account. A criminal may take control of your account or send emails in your name from another infected computer.
- Frequent crashes. A virus can inflict major damage on your hard drive. This may cause your device to freeze or crash. It may also prevent your device from coming back on.
- Unusually slow computer performance. A sudden change of processing speed could signal that your computer has a virus.
- Unknown programs that start up when you turn on your computer. You may become aware of the unfamiliar program when you start your computer. Or you might notice it by checking your computer’s list of active applications.
- Unusual activities like password changes. This could prevent you from logging into your computer.
How to help protect against computer viruses?
How can you help safeguard your computer equipment from viruses? Here you may perform some things to keep your machine secure.
- Use a trusted antivirus product, such as Norton AntiVirus Basic, and keep it updated with the latest virus definitions. Norton Security Premium offers additional protection for even more devices, plus backup.
- Avoid clicking on any pop-up advertisements.
- Always scan your email attachments before opening them.
- Always scan the files that you download using file sharing programs.
What are the different types of computer viruses?
1. Boot Sector Virus
This type of virus can take control when you start — or boot — your computer. One way it can spread is by plugging an infected USB drive into your computer.
2. Web Scripting Virus
This type of virus exploits the code of web browsers and web pages. If you access such a web page, the virus can infect your computer.
3. Browser Hijacker
This type of virus “hijacks” certain web browser functions, and you may be automatically directed to an unintended website.
4. Resident Virus
This is a general term for any virus that inserts itself in a computer system’s memory. A resident virus can execute anytime when an operating system loads.
5. Direct Action Virus
This type of virus comes into action when you execute a file containing a virus. Otherwise, it remains dormant.
6. Polumorphic Virus
A polymorphic virus changes its code each time an infected file is executed. It does this to evade antivirus programs.
7. File infector virus
This common virus inserts malicious code into executable files — files used to perform certain functions or operations on a system.
8. Multipartite virus
This kind of virus infects and spreads in multiple ways. It can infect both program files and system sectors.
9. Macro virus
Macro viruses are written in the same macro language used for software applications. Such viruses spread when you open an infected document, often through email attachments.
How to remove computer viruses
Two ways to eradicate a computer infection can be used. One is the manual way to do it yourself. The alternative is to enroll the aid of a well-known application for antivirus.
Would you like to do it yourself? When it comes to eradicating a computer virus, there may be many variables. Usually, this procedure starts with an online search. A large list of actions may be requested. You’ll need time and probably some expertise to complete the process.
You typically can eradicate a computer infection using an antivirus software application if you prefer a simpler way.