Coding Language That Is Considered To First Fully Use Object-Oriented Computer Viruses and How to Deal With Them

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Computer Viruses and How to Deal With Them

1- What is a computer virus:

A computer virus is a software program that is capable of replicating and spreading from one infected computer to another. Infected objects can be system, program or document files. After infecting your computer, it could slow down, damage the contents of infected files, mislay data or impair the normal operation of your computer system.

The virus can also use your computer to spread illegal advertisements and send spam emails that exploit security (adWare), steal your personal information such as bank account number, credit card number, etc. (SpyWare). Some types of viruses may use your computer to create a bot network (virtual computer network) to attack other server systems and websites, etc.

2- Type of virus on Windows based computers:

There are a number of computer viruses that can stop your computer from working. Here are some of the different types of viruses:

Trojan Horse: It is an email virus that is created from a file attached to the email. If it is opened, it can scan your hard drive for any personal and financial information such as your social security, account and PIN numbers. Once your information is collected, it is sent via the Internet to a hacker or thief.

Macro Virus: It is a computer virus that infects documents in Visual Basic language for applications such as Microsoft Word, Microsoft Excel etc. This type of virus can cause damage (like removing data on the hard disk for example).

Worms: It is a program that has the ability to self-replicate itself. It can move from one computer to another and replicate itself in your computer system then spread hundreds of its copies to other computers that could cause widespread damage.

Rootkit Virus: It is a program that is possible to cover the processes, files and data in the Registry of the computer (a database that is used to save the Windows system and program settings). Rootkit is generally used to hide the activity of viruses and processes that damage your computer. It is to help a hacker to control the system.

Bootsector Virus: A virus that attaches itself to the first part of the hard drive that is read by the computer at startup. These are normally scattered from diskettes.

Logical bombs: It is a program that is used to send multiple data to the same email address and over the system or block the server connection. It is also used to threaten others (for example, mail bomb etc.).

Memory Resident Virus: This type of virus resides in the RAM. From there it can override and interrupt the operations performed by the system. It can corrupt files and programs that are opened, closed, copied, renamed etc.

Multipartite Viruses: These viruses spread in many ways. It could vary in its action depending on where it is installed and the presence of certain files.

3- How to get a virus and Prevention:

Here are 3 common ways your computer can become infected with viruses:

E-mail: You have an e-mail from a person that contains one or more viruses. If the attachment is opened, viruses can infect the files on the computer. Viruses can also send emails to people from your email address book or email folders automatically. Therefore, you should not open unknown attachments in e-mails or perform a virus scan after opening them.

Internet: If you download an exe file or a data file from the Internet or other common networks, viruses could be transferred to your computer. Sometimes free software programs on the Internet have viruses especially if you download them from sources like Torrent or Usenet newsgroups. Therefore, if necessary, you should download files from trusted resources.

Peripheral devices: Devices such as an MP3 player, a USB drive, a memory card or a CD Rom are also means of spreading viruses. So, remember to do a virus scan for them after they are connected to your computer.

4- Symptoms of viral infection:

Here are some of the symptoms that may indicate virus activity:

• Your computer has unusual activity (eg programs crashing a lot or running slowly).

• Messages or images (unrelated to your current task) come unexpectedly.

• A program can start unexpectedly.

• Your firewall reports that a certain application is trying to connect to the Internet (unrelated to what you are working on).

• Your friends say they get emails from you, but you haven’t sent them.

• You receive many system error messages. (Note: This can also come from another activity like a hardware problem or a real system error)

• Windows does not run when you start your computer. (Note: This can also come from a hard drive problem)

• You realize that folders and files have been deleted or changed.

• You will find that there is access to your hard disk (one of the small lights is flashing) even if there are no programs running.

• Your web browser has abnormal indications, for example it opens an unknown web page or you cannot close the browser tabs.

• Advertising pages pop up, change the desktop wallpaper.

• Exe files occur and have the same names as the folders.

• On the right corner of your computer, there is a small symbol written “Your computer is infected” or “Virus Alert” etc.

• When you open a USB drive, unknown files like Autorun.inf, New Folder.exe etc.

• Can not press Control + Alt + Delete (Task Manager) and you are warned that Administrator prohibited.

• Folder Options disappears.

• Your computer keeps restarting when you try to shut it down.

• You can’t log in to your Windows account with the right login details.

5- What to do when infected:

• Make sure that your Antivirus program is the latest update. If necessary, download the update from another computer and update manually.

• Disconnect from the Internet or Local Area Network (LAN).

• If Windows is not running, start in Safe Mode (when you turn on your computer, hold down F8 as soon as the computer starts running, then choose “Safe Mode” from the Menu).

• Run a full Anti-Virus scan.

• If your computer is quite infected, but you have important files or documents on it, run a full scan with your updated Antivirus software. If it finds viruses, delete them all, open any ancillary disk (USB, Thumb drive etc.) and look for the Autorun.inf files and delete them. Then, restart your computer.

• If you have any difficulty finding a way to remove bad programs, refer to your Internet Security Software Supplier to look for an indispensable tool dedicated to removing them.

• If you find a bad program, follow the instructions of your Internet Security Software Supplier. A good Security software provides options like disabling infected files, isolating possibly infected files, removing Worms and Trojans.

• If you don’t have important files on your computer disks, format the disk and then reinstall your Windows and applications. This is an extreme and lengthy process and it is recommended to back up your computer settings before starting. When it’s finished, don’t open it on any auxiliary disk (USB, Thumb drives, etc.), install the Antivirus software, do a full scan, find the Autorun.inf files and delete them. Restart your computer afterwards.

• If the Anti-Virus program does not find anything, your computer is possibly not infected. Check that your hardware and the software that is installed on your computer meet the hardware specifications of the Operating System. Remove unnecessary or unwanted programs to save resources and make sure you have updated your Windows operating system via Windows Update.

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