What is a virus?
A computer virus is a type of malware that attaches itself to a legitimate program or file and replicates itself. When the infected program or file is executed, the virus is activated, and it can spread to other programs and files on the computer or network. The primary goal of a virus is to replicate and spread, causing damage to the infected computer or network.
Viruses can be spread through email attachments, infected websites, or file-sharing networks.
A virus can cause a range of problems, including slowing down the computer’s performance, corrupting files, and deleting important data. In some cases, a virus can also allow hackers to gain access to the infected computer, giving them access to sensitive data and personal information.
What is a worm?
A worm is a type of malware that is designed to spread quickly through a network by exploiting security vulnerabilities. Unlike a virus, a worm does not need to attach itself to a program or file to spread. Instead, it can replicate itself and spread from computer to computer, often without the user’s knowledge.
Worms can spread rapidly and cause widespread damage to computer networks, sometimes causing entire systems to crash. They can also be used to install other types of malware, such as spyware or keyloggers, on the infected computer. Worms can be spread through email, instant messaging, or through security vulnerabilities in software and operating systems.
What is a trojan?
A trojan, short for the trojan horse, is a type of malware that disguises itself as a legitimate program or file. Once the user installs or executes the trojan, it can perform a variety of malicious actions, such as stealing data, modifying files, or installing other types of malware.
Trojans can be spread through email attachments, infected websites, or software downloads. They are often used in targeted attacks, where the attacker is looking to gain access to specific systems or steal sensitive data.
How are these types of malware dangerous?
All three types of malware can be dangerous and cause significant harm to computer systems and networks. Viruses, worms, and Trojans can cause a range of problems, including:
- Slowing down the computer’s performance: Malware can use up system resources and slow down the computer’s performance.
- Corrupting files: Malware can corrupt files and make them unusable, leading to data loss and other problems.
- Stealing data: Malware can be used to steal sensitive data, such as passwords, credit card numbers, and personal information.
- Installing other types of malware: Malware can be used to install other types of malware, such as spyware or keyloggers, on the infected computer.
- Giving hackers access to the infected computer: Malware can allow hackers to gain access to the infected computer, giving them access to sensitive data and personal information.