WHAT IS COMPUTER VIRUS?
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| Computer Viruses and Antivirus Software: Types, Prevention and Protection |
A computer virus is a type of malicious software that is designed to replicate itself and spread to other computers. It can cause harm to a computer system, such as deleting files, stealing personal information, or displaying unwanted advertisements. Viruses typically spread through email attachments, infected software downloads, or by being transferred from infected external storage devices. The best way to protect against viruses is to keep your operating system and antivirus software up to date, and to be cautious when opening email attachments or downloading software from the internet.
The word VIRUS is sometimes expanded in teaching materials as “Vital Information Resources Under Siege.” This is a mnemonic, not the technical origin or a formal acronym for the word virus.
How to prevent from Computer Virus?
There are several steps you can take to prevent your computer from getting infected with a virus:
- Keep your operating system and software up to date: Make sure to install updates and patches as they become available, as they often include security fixes that can help protect against known viruses.
- Use antivirus software: Antivirus software can help detect and remove viruses that may already be on your computer, as well as prevent new viruses from being downloaded.
- Be cautious when opening email attachments: Be wary of opening email attachments, especially if they are from an unknown sender or contain unexpected content.
- Be careful when downloading software: Only download software from reputable sources and be sure to read the terms and conditions before installing.
- Keep your Firewall on: A firewall is a software that monitors your incoming and outgoing network traffic, and can help to block malicious traffic.
- Avoid clicking on suspicious links: Be cautious when clicking on links in emails or on websites, as they may lead to malware-infected sites.
- Regularly backup your important files: Backing up your important files regularly can help you to recover them in case your computer is infected with a virus and you need to wipe it clean.
- Educate yourself about the latest threats: Keep yourself informed about the latest computer viruses and the ways they can infect your computer.
Following above steps can help you to protect your computer from viruses, but it is important to note that no method is foolproof, and new viruses are constantly being created.
Types of Computer Viruses
There are several types of computer viruses, each with their own unique characteristics and methods of infection. Some common types of viruses include:
- File Infectors: These viruses infect executable files and can spread when the infected files are run or opened.
- Boot sector viruses: These viruses infect the boot sector of a hard drive, which is the area of the disk that contains the code that starts the operating system.
- Macro viruses: These viruses infect Microsoft Office documents and spread when the infected document is opened.
- Trojan horses: These are not viruses but are malicious programs that disguise themselves as legitimate software and can be used to steal personal information, delete files, or take control of a computer.
- Worms: These are self-replicating programs that can spread quickly through networks, email, and instant messaging.
- Ransomware: This is a type of malware that encrypts a victim's files, making them inaccessible, and demands a ransom payment in exchange for the decryption key.
- Adware: These are software that displays unwanted ads, pop-ups and can track the user's browsing habits and personal information.
- Rootkits: These are a type of malware that is designed to conceal the presence of other malicious software, such as viruses and Trojans, by hiding files, processes, and registry keys.
It's important to note that these are just a few examples of the many different types of viruses that exist, and new types are constantly being created.
Virus, Worm and Trojan Horse: What Is the Difference?
Viruses, worms and Trojan horses are all forms of malware, but they behave differently. A virus attaches itself to a host file or program and usually spreads when that host is executed. A worm is a standalone malicious program that can spread automatically between computers or networks, often by exploiting security weaknesses. A Trojan horse disguises itself as legitimate or useful software and relies on a user installing or running it; it does not self-replicate in the same way as a virus.
How Malware Spreads
Opening or running an infected file, application or attachment. Sharing infected documents or executable files through email, messaging services, cloud storage or removable drives. Using infected or untrusted USB drives and other removable media. Visiting compromised websites or downloading software from untrusted sources. Exploiting unpatched operating systems, applications or network services.
How to Protect a Computer from Viruses and Malware
- Use reputable security software: Install trusted antivirus or endpoint-security software, keep it enabled, and allow it to update automatically. Use real-time protection where available.
- Keep software updated: Install security updates for the operating system, browser, office applications and other software. Updates fix vulnerabilities that attackers may exploit.
- Scan downloads and removable media: Scan files downloaded from the internet and removable drives before opening or using them. Do not assume that a file is safe simply because it came from someone you know.
- Be careful with email and messages: Avoid unexpected attachments and links. Check the sender and context, and confirm unusual requests through another trusted channel. Never forward virus warnings without verifying them.
- Back up important data: Maintain regular backups of important documents and files. Keep at least one backup separate from the computer, such as an offline or protected cloud backup, and periodically test that files can be restored.
- Use standard user accounts: Use a standard account for everyday work when practical, and provide administrator permissions only when necessary.
- Use strong authentication: Use unique passwords and multi-factor authentication for important accounts. This helps reduce the damage caused by stolen credentials.
- Enable built-in protections: Use the firewall and built-in security features provided by your operating system, and avoid disabling them unless there is a clear, trusted reason.
What Is Antivirus Software?
Antivirus software is a security program designed to detect, block, quarantine and help remove malicious software. Modern security products may also include protection against spyware, ransomware, phishing, malicious websites and other threats. Detection methods can include known malware signatures, behavior monitoring, reputation checks and cloud-based analysis. No security product can guarantee that every threat will be detected, so safe user behavior, updates and backups remain important.
Examples of Antivirus and Security Products
- Microsoft Defender Antivirus
Important Safety Reminder
Antivirus software is only one part of computer security. Keep devices and applications updated, download software from trusted sources, think carefully before opening links or attachments, use strong authentication, and maintain reliable backups. If you suspect an infection, disconnect the affected device from networks when appropriate, run a full scan using trusted security software, and seek qualified technical support if important data or business systems may be at risk.
