All about computer virusMd Emon
A computer virus is a type of computer program that can be copied by itself without the user’s permission or idea. Like metamorphic viruses, they can modify the actual virus copies or the copies themselves. A virus can spread from one computer to another only when the infected computer is moved to a normal computer. For example, a user can transmit the virus through a network or spread it through a portable medium such as a floppy disk, CD, USB drive, or the Internet. Viruses can also infect a network file system, infecting other computers that use that system. Viruses are sometimes associated with computer worms and Trojan horses. A Trojan horse is a file that remains undamaged until executed.
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The way the virus enters the device
Many personal computers (PC) are now connected to the Internet and local area networks to help spread malicious code. Viruses can be transmitted through the World Wide Web, e-mail and computer file sharing. Some viruses are created by destroying a computer by destroying programs, deleting files, or rebuilding a hard disk. While many viruses do no direct damage to computers, they make countless copies of themselves that manifest their presence through text, video, or audio and text messages. Innocent Philosophy– these viruses can also create many problems for the user. These occupy the necessary memory of normal programs. Several viruses create bugs, which can lead to system crashes or data loss.
History of virus
Computer viruses, this one name is enough to make the technology users of the world tremble. As a rule of thumb, this virus is no longer just on computers, mobiles, tabs, laptops, etc., various types of gadgets can be infected by the virus. However, there are various antiviruses available in the market to control this virus. But for any user, the virus is synonymous with fear. But where did this virus come from? Who first launched this terrible virus called software?
The first computer virus was reported in 1949 by American scientist John Von Neumann. His hypothesis manifests itself as an exact duplicate of a program. Later it became known as a computer virus. In the beginning, viruses were created and tested in the laboratories of various reputed universities. The first out-of-laboratory virus to spread to other computers was created by Elk Cloner and programmed by Richard Scenta, a schoolboy in the United States at the time.
Viruses of this period spread through floppy disks. As a result, they would not be able to have much impact on security. Although the virus began to spread through the Internet in the early 1990s, the biggest attack was in 1999. It was created by David L. Smith, an American citizen. The virus, called the Melissa virus, spreads via e-mail. In this process, a word file is attached to the e-mail, which would have infected the user if it had been opened. In addition, the infected person would automatically spread the Melissa virus to 50 other people in his e-mail. As a result, users were forced to close numerous e-mail accounts due to the Melissa virus.
Then comes the attack of the worm. Worms can spread to all computers on their own, which is not possible for any other virus. In May 2000, a worm called Lovebug spread around the world. It had a letter attached to it called I Love You, which, if opened, would cause the computer to be attacked by worms. The Trojan Horse attack began in 2006. It is a kind of malware. All types of malicious software are called malware. These include viruses, worms, Trojan horses, spyware, etc. The latest and most recent computer virus we hear about is ransomware.
Symptoms of computer virus
Sometimes there is a virus in the system but no symptoms are understood. The symptoms of different viruses can be different. It all depends on the function of the virus and the purpose for which the virus was created. For example, if your computer is automatically displaying ads, pop-up pages are opening in your computer browser, other web pages or websites are opening automatically, your computer may have an “Adware Virus”
In addition, many times the virus sits silently inside your computer system and it slowly edits your system or program files and puts its code in it. In this case, you will not be able to catch such viruses but you will understand some common problems like computer restarting itself, your system hangs too much, also showing various error messages etc. These symptoms may cause you to suspect.
In addition to these,
- The internet is slow
- The computer works wonderfully
- Suddenly the computer hangs somewhere
- In addition, various applications suddenly or automatically start or stop
- Showing various system errors
- Problems with hardware or software
If you see these kinds of problems on your computer, then it can be a symptom of a virus. You can also do a thing to find out if these are symptoms of a virus: You can install antivirus on your computer and scan your computer with that antivirus to see if there is any virus in your system.
Ways to prevent computer viruses
From the above information, you have learned about the symptoms of virus infection in a computer. Learn more about ways to keep your computer virus free. Following these steps will keep your computer virus-free.
- Download and active antivirus software which will scan and remove the computer virus.
- Delete a spam email before opening it.
- Don’t download songs, movies, apps, games and files from Pirated websites.
- Scan any downloaded thing with antivirus and then open it.
- After scanning devices like pen-drives, disks, insert them into the computer.
- Avoid downloading any documents from untrusted websites.
- Do not click on all lottery or money related alluring advertisements.
List of some computer viruses
There is a list of the most dangerous computer viruses in the world below.
- Morris Worm
- SQL Slammer
- Tinba(Tiny Banker Trojan)
List of some antivirus
Antivirus is a type of software that, after detecting computer viruses and malware, removes them from the computer. Below are the most commonly used and effective antiviruses today.
- Bitdefender Antivirus Plus
- Avira Antivirus Pro
- F-Secure Antivirus SAFE
- G-Data Antivirus
- Norton Antivirus Plus
- Kaspersky Antivirus
- Trend Micro Antivirus
Hopefully, you have learned the details about computer viruses from the above information. If you have any further questions about computer viruses, you can let us know in the comments. So, after reading this article, if you have known any new topic, share it with your acquaintances and if you also know any such subject, don’t forget to comment.