The Concept of Computer Viruses | Antivirus

Computer viruses are programs made intentionally with the purpose of changing the properties of the files they infect in order to carry out some commands either to remove, modify, sabotage, or hack and similar operations, and try to reproduce within them, and it is not necessary that the goal is to disable the program, but in most cases, the virus is transmitted from the computer to computer Else when running an infected program or opening infected files.

The word VIRUS, meaning in the term computer, is (malicious software) in general, and it is a group of programs programmed by a group of professionals in a certain way to work on sabotaging operating systems and programs or to spy on user information and steal it, and it has several types that I will mention in detail.

Types of Viruses:

1- Multiple transformable viruses (deceptive): These viruses have the dynamic ability to convert and change their code when moving from one file to another in order to be difficult to detect.

2- Operating sector viruses: These viruses settle in the places that the computer reads on the hard disk when it is booted up (turned on) to settle in the memory and execute its code.

3- Macro viruses: It is the latest type of virus, and it is a virus written in the Word language that infects data files. It also recommends office files

4- Multiple-file viruses: This virus starts in the device in an initial format and then turns to other formats to infect other files.

5- Hidden viruses: These viruses hide in the memory and then confront me with any request for diagnosis and examination of the operating sector to send a report that the operating sector is healthy and not infected.

6- Executable file viruses: These viruses affix themselves to executable program files such as command.com and win.com

7- Multipart (or multi-tasking) viruses: This virus infects the boot sector (started) and files simultaneously.

8- Boot Sector viruses: It is the most dangerous type of viruses that infect the operating sector in the hard disk.

9 - Parasitic viruses: These viruses stick to the executable files to settle in the memory when one of the infected programs is running, then they wait in the memory until the user runs another program and then infects him and transmits the infection to him.

10- Advanced viruses: so-called because they also change their code, but when moving from one device to another

Components of the Virus

1- The Replication Mechanism

2- The Protection Mechanism

3- The Trigger Mechanism

4- The Payload Mechanism

Types of Viruses That Infect the Computer:

Computer viruses such as warms and this virus only spread through Internet networks through the email address book.

Trojan horses and this virus is associated with a program without the user's knowledge.

Droppers download programs, which are designed to evade anti-virus programs as they often rely on encryption to prevent their discovery, usually work to transfer and install viruses, and spread the virus when a certain command occurs on the computer.

Logic bombs are designed so that they work when executing specific commands and lead to wiping or disrupting the system, and it can be one of the types of Trojans.

Computer Virus Damage:

• Viruses do harm, but many of them are harmless in a direct way, and they are called harmless viruses.
• High consumption of storage space.
• Exploiting a large portion of computer memory
• • Infringement of intellectual property rights by modification without the consent of the owners of the programs or files.
• Processing energy space.
• • You need to run virus detection software, which creates a burden on the user, the device, and the cost.
• Cause inconvenience and anxiety.
• To prevent viruses:
• Use virus detection software in the device.
• Keep backup copies of programs and files on the computer.
• Performing the examination on the software downloaded (downloaded) or transferred from the Internet before running it.
• Use antivirus software.
• Use the GNU / Linux operating system, as it is considered safer and has few viruses, unlike the Windows operating system.
• Do not run any program or file that you do not know exactly.
• Beware of unknown source emails and check them before opening them.