1- What is a computervirus?
A computer virus is software that can replicate and spread from one computer to another. Infected files can include program, system and document files. Infecting your computer can slow down your computer’s performance, cause damage to the files inside, delay data transfer, or disrupt your computer’s normal operation.
You can also allow the virus to use your computer for illegal ads and spam email sending. (SpyWare). Some viruses may use your computer to create bot networks (virtual computer networks) that attack other servers, websites, etc.
2- Types of viruses found on Windows-based computers
Computer viruses can cause problems with your computer’s performance. These are just a few of the many types of viruses that can infect your computer.
Trojan Horse: This email virus is caused by an attachment to an email. It can search your hard drive looking for personal and financial data, such as account numbers, social security numbers, and PIN numbers, if it is opened. Once it has your information, it sends it via the internet to hackers or thieves.
Macro virus: This computer virus infects Visual Basic language documents used to create applications like Microsoft Word, Excel and others. This virus can cause serious damage, such as the deletion of data from your hard drive.
Worms: This program can self-replicate. It can travel from one computer to the next and then replicate in your computer system. Once it is done, hundreds of copies of itself will be distributed to other computers. This could lead to widespread damage.
Rootkit Virus is a virus that can cover files, processes and data in your computer Registry. This database is used to save Windows programs and settings. Rootkit is used to conceal the actions of viruses or other processes that could harm your computer. It’s used to allow hackers to control the system.
Bootsector virus: A virus that attaches to the first portion of the hard drive that is being read by the computer when it boots up. They are usually spread via floppy disks.
Logic Bombs is a program that sends many data to one email address, and can overwhelm the system or stop the server connection. It can also be used to menace others (e.g. mail bomb). ).
Memory Resident Virus (MRV): This virus lives in RAM. It can then override and disrupt the system’s operations. It can also corrupt files and programs, such as those that have been opened, closed or copied.
Multipartite virus: These viruses can spread in many ways. It can take different actions depending on where it is installed and whether certain files are present.
3- How can you prevent getting a virus?
These are three common ways your computer could be infected with viruses.
Email: An email you receive from someone contains viruses. The viruses can infect files if the attachment is opened. You might also receive emails from the viruses automatically, if they are not already in your email address books or folders. You should never open any unknown attachments or scan them after you have opened them.
Internet: Viruses can be transmitted to your computer if you download an executable file or a file from the Internet. Sometimes, viruses can be found in free software programs downloaded from the Internet. This is especially true if they are downloaded from sites like Torrent and Usenet news groups. If you feel the need to download files from trusted sources, it is best to do so.
Peripheral devices are devices like the MP3 player, USB thumb drive and Memory card. These devices can also spread viruses. After they have been connected to your computer, make sure you run a virus scan.
4 Symptoms of a virus infection
These are just a few symptoms that could indicate virus activity.
* Your computer is experiencing unusual activity (e.g. Programs are slowing down or crashing frequently.
* Unexpectedly, messages or images that are not related to your current task may come up.
* Programs can start unexpectedly
* Your firewall tells you that an application is trying to connect with the Internet. This information is not related to what you are doing.
* Friends claim they receive emails from you, but you have not sent any.
* You get many system error messages. (Note: This could also be caused by a hardware problem, or genuine system errors)
Windows will not start when you open your computer. (Note: This could also be caused by a hard drive problem.
* You realize that folders or files have been deleted or modified.
* Even though you don’t have any programs running, you can see that your hard drive is accessible (a small light blinks).
* An abnormal indication in your web browser is that it opens an unknown website page or that you can’t close the browser tabs.
* Advertising pages pop up, desktop wallpaper changes.
* Exe files exist and have the exact same names as folders.
* In the upper right corner of your computer you will see a small symbol that says “Your computer has been infected” or “Virus alert”, etc.
Unknown files like Autorun.inf, New Folder.exe, etc. will appear when you open a USB thumb drive. appear.
* You are being warned by Administrator that you cannot press Control + Alt + delete (Task manager)
* Folder Options disappears.
* When you shut down your computer, it keeps restarting.
* Windows accounts cannot be logged in without the correct logon details.
5- What to do if you are infected
* Make sure your Antivirus software has the most recent update. You can also download the latest update from another computer, and then manually update it.
* Disconnect from the Internet (LAN)
* Windows may not be running. To start Windows in Safe Mode, press F8 when the computer is turned on. Then, select ‘Safe Mode’ from your Menu.
* Run a full Anti-Virus scan.
* Run a scan of your computer with the latest Antivirus software if it is infected and you still have files or documents. If the virus detection is successful, you can delete all files and then open each ancillary drive (USB, Thumb drive, etc.). Look for Autorun.inf files, and then delete them. Afterward, restart your computer.
* You can ask your Internet Security Software Supplier for help in finding the right tool to get rid of bad programs.
* Follow the instructions provided by your Internet Security Software Supplier if you find a problem program. A good security software will offer options like disabling infected file, isolating potentially infected file, and Worms or Trojans removal.
Format your disk if you don’t have any important files. Then reinstall Windows and your applications. This can be a very difficult and time-consuming process so it is recommended that you back up your computer settings before starting. After the scan is complete, close any other ancillary drives (USB, Thumb drives, etc.). Install the Antivirus software and run a scan. Once you are done, delete Autorun.inf files. After that, restart your computer.
* Your computer may not be infected if the Anti-Virus software finds nothing. Make sure your hardware and any software installed on your computer meet the specifications of the Operating System. To save resources, delete unwanted programs and make sure you have updated Windows OS via Windows Update.