Computer Virus Definition & Its Types

Virus: A Threat to Every Computer.

A computer virus is a malicious software program that replicates itself to spread from one computer to another. Data storage devices such as USB flash drives, external hard disks, SD cards, etc., can transfer viruses from one device to another when plugged into the computer.

When the virus reaches the device, it may corrupt or delete data stored on it. Data protection is one of the most important aspects of computer use; to safeguard data, users must take precautions such as not opening attachments from unknown sources or clicking on pop-up ads (potential sources of viruses), which they are unsure about.

How Does A Computer Virus Attack?

Computer virus attacks can come from two sources: a user inadvertently running a malicious program (for example, opening an email attachment) and as part of another program (such as when one downloads software). 

The vast majority of viruses target systems like Microsoft Windows. Data storage devices such as USB flash drives, external hard disks, and SD cards can transfer viruses from one device to another when plugged into the computer.

Some signs that your computer may be infected with a virus are:

  • Computer programs running or installing themselves without user input.
  • Slow performance.
  • An antivirus program detects a virus on the computer.
  • Pop-up alerts or changes to settings that are inconsistent with user input.

The most common types of viruses are:

  • Data, which enters the device through an attachment in an email or downloaded software. Data viruses can be categorized as simple, complex, multipartite, stealth, and parasitic.
  • Macro, which affects spreadsheet programs like Microsoft Excel. These viruses can either be file-based (attaching to document files) or memory-resident (running in the computer’s random access memory).
  • Script, which affects the running of a program. They are similar to boot sector viruses, except they affect application programs instead of operating systems. Script viruses rely on their host program to spread.
  • Boot sector, which affects the operation of the computer. Boot sector viruses install themselves in the boot sector of a disk, which is typically the first sector on a disk and contains information about how partitions are formed.

Computer Virus Protection

In today’s world, data storage and security have become increasingly important for individuals and businesses. It’s an investment, but you must remember that the cost of not having it would be greater. 

Data protection can avoid viruses from destroying your important files and giving you sleepless nights. Data breaches can result in huge financial losses for your company because it damages reputation, exposes trade secrets, or destroys your competitive advantage.

You might not be able to see it, but your business could be under attack. You can consult us at Upstart Cyber to facilitate a thorough audit and make the best moves forward. 

With over 10 years of experience in cybersecurity issues, we are more than ready to help you.


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