computer systems are vulnerable to many threats ranging from errors, harming stored data, and information, or corrupting programs installed on the computers.
The following are some common types of threats to the computer:
A computer virus is the most common and well-known computer security threat. A computer virus is a program written internationally to alter the way a computer operates, without the permission or knowledge of the user.
A virus replicates and executes itself by attaching the copies to other files such as program files or documents. When activated a virus may:
Examples of viruses are NYB, Anti-Exe, Cascade, FRODO, Win95, and Zmist A, etc.
Computer worms are malicious programs that replicate and spread independently and harm the computer. Worms spread through the network and over the internet to computers that are connected to the internet.
Worms are also spread by copying themselves from disk to disk or by E-Mail. SQL Slammer, The Blaster Worm, Sasser Worms, Melissa, and ILOVEYOU are examples of computer worms.
Computer worms can:
Adware is software that automatically plays, displays, or downloads advertisements to computers usually without the user’s knowledge. These advertisements can be in the form of a pop-up. They record users’ behavior on the internet; display ads and can even download other malicious software on the computer.
They may also be in the user interface of the software or on a screen presented to the user during the installation process.
Hacking can be defined as the unauthorized use of a computer, network, and resources. People who indulge themselves in computer hacking activities are called Hackers. Hackers are computer experts who use their expertise for malicious purposes.
there are different ways through which a virus, worms, and adware spread from one computer to the other. A virus, worm, and adware can be spread through:
Flash drives and disks are convenient, popular, and easy-to-use storage devices. Flash drives and disks are the main sources of spreading viruses among computers. Once an infected flash drive or a disk is connected to a healthy computer, it becomes infected with viruses. In this way, the virus spread from one computer to the other.
It is a file that can be sent with an email from one computer to the other. An E-Mail virus is a computer code sent as an E-Mail attachment. If activated, it may cause some harmful effects, such as destroying certain files on the hard disk and causing the attachment to be forwarded to anyone in the address book. E-Mail Viruses distribute themselves automatically by E-Mail.
These viruses require the user to double-click on the attachment containing viruses. This causes the malicious code to mail itself to other people from that computer. The best defense against E-mail Viruses is to never open an unknown E-Mail.
A website that is set up to spread a virus or for some other unethical purpose is an insecure website. These websites engage in questionable or unethical practices and attempt to:
The software which has been duplicated and distributed without authorization is called Pirated Software. Pirated software may be faulty or loaded with malware and may contain viruses.
Pirated software can threaten the safety of computer users. These software products may be used to steal personal information, loaded a computer with viruses, or engage in activities that can harm the computer.
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