🚀 Agentic AI vs Machine Learning: Not Just Different — They Operate at Completely Different Layers

                Understanding Computer Viruses: How They Work and How to Stay Safe

Introduction:

A computer virus is a type of malicious software program specifically designed to disrupt the normal functioning of a computer. The word "virus" stands for Vital Information Resources Under Siege. These harmful programs have the ability to replicate and spread from one system to another, often without the user's knowledge. Once a virus infects a computer, it can damage or delete important data, alter program settings, and, in some cases, steal sensitive information from the user. Stolen data is often transmitted back to the creator or controller of the virus. Over time, computer viruses have evolved to become more sophisticated, targeting not just individual computers but also networks and large organizations. Understanding how viruses operate is the first step in protecting your devices and data from these ever-present threats.

Recent data reveal the seriousness of this issue:-

• Around 560,000 new malware programs are detected every day worldwide.
• Over 1 billion malware programs have been created in the last decade.
• Mobile malware attacks have increased by 25%, targeting smartphones and tablets.
• About 70% of ransomware attacks target small and medium-sized businesses.
• More than 60% of organizations worldwide report experiencing malware attacks at least once a year.

Let's explore the various types of computer viruses and understand how each one operates:

(i) Polymorphic Virus:- Polymorphic viruses are named for their ability to take on many forms. These viruses can continually alter their code or appearance, making each subsequent version distinct from the previous one. Because they lack a consistent signature pattern, they are especially challenging for antivirus software to detect and remove.

(ii) Encrypted Virus:- This type of virus uses encryption to conceal its code, making it much harder for antivirus programs to detect and analyze. By encrypting their form, these viruses can disguise their true nature and evade traditional signature-based detection methods. Each time the virus infects a new system, it may use a different encryption key, further complicating efforts to identify and remove it. This technique allows the virus to remain hidden and continue spreading without being easily discovered

(iii) Boot Sector Virus:- The boot sector is a critical part of a storage device that contains the files and instructions needed to start the operating system. A boot sector virus infects this area, allowing it to load into memory before the operating system starts running. These viruses typically enter a system during the boot process and can damage storage devices such as floppy disks and hard drives, potentially corrupting essential system files and making the device unusable.

(iv) E - mail Virus:- This type of virus is often delivered through a hyperlink, which can be embedded in an email and sent to many recipients. When someone clicks on the malicious link, their system can become instantly infected with the virus. In some cases, clicking the link may not immediately cause harm but could instead trigger actions that allow attackers to steal sensitive data or gain unauthorized access to the user’s device.

(v) Malware:- The term “malware” is a combination of the words “malicious” and “software.” It is a broad term used to describe any program designed to infiltrate a computer system and cause harm without the user’s knowledge. Malware can disrupt the normal functioning of a computer, corrupt files, and steal sensitive information, often operating silently in the background to avoid detection.

Some types of malware are given below:-

• Bancos:- This type of malware is designed to steal sensitive information. It silently waits for the user to visit banking websites, and while the user is browsing, it captures confidential data such as login credentials or financial details.
• Gator:- This malware covertly tracks the user's web browsing activities and sends the collected information to a remote server. Based on this data, the server then delivers targeted pop-up advertisements to the user's device.
• Logic Bombs:- A logic bomb is a type of malicious program that requires an external component, known as a trigger, to activate. Its primary purpose is to cause harm to the computer system, often targeting hardware components. The logic bomb remains dormant and undetected until the specified trigger is received. Once activated, it executes its destructive payload, potentially damaging the system much like an exploding bomb.
• Ransomware:- This type of malware, known as ransomware, steals sensitive information and data from a victim’s system and demands payment in exchange for restoring access. It typically uses encryption to lock the victim’s files, making them inaccessible. Only after the victim pays the demanded amount to the attackers is access to the data or system usually restored.
• Rootkits:- This type of malware creates a backdoor by compromising the operating system, allowing attackers to gain unauthorized access to the victim’s system. Through this hidden entry point, cybercriminals can easily infiltrate the computer to alter or damage system files.

Now let us talk about the symptoms of virus:-

• The computer may begin to perform actions on its own, such as moving the cursor unexpectedly or randomly opening and closing applications without any user input.
• Malfunctioning may be noticed in many applications.
• The processing speed of the computer will drop.
• The computer may start and shut down frequently.

Now, let’s discuss how computer viruses spread in a system:-

(i)When an infected removable storage device is placed in a system.

(ii)The computers are interconnected with each other on the internet, due to which there is an increased chance of a virus attack.

(iii) Many e-mail attachment consist of a malicious link that is being sent to many people, and when the user opens it so virus gets entered into the system.

Now, let’s explore the various methods for preventing computer virus infections.

• Install a reliable antivirus program on your PC and ensure it is regularly updated to provide the best protection against threats.
• Install firewall to manage incoming and outgoing network traffic.
• Scan the downloaded file before opening it.
• Take  backup of your data regularly.
• Avoid downloading pirated software.

In conclusion, computer viruses and other forms of malware continue to pose serious threats to individuals, businesses, and organizations worldwide. Understanding the various types of viruses, how they spread, and the damage they can cause is essential for protecting your data and devices. By staying informed, practicing safe browsing habits, and maintaining up-to-date security software, users can significantly reduce the risk of infection. Ultimately, vigilance and proactive measures are the key to maintaining a secure and resilient digital environment.