Difference between virus, worm, trojan, spyware.

Malware: - (Malicious Software)
Malware refers to software programs designed to damage or do other unwanted actions on a computer system. In Spanish, "mal" is a prefix that means "bad," making the term "badware," which is a good way to remember it.

Common examples of malware include



Trojan horses


What is the full form of VIRUS ?

Virus – Vital Information Resources Under Seize

A computer virus is a computer program that can replicate itself and spread from one computer to another without your knowledge and runs against your wishes.

Effects of Virus:-

1) It can quickly use all available memory and bring the system to a halt.

2) It can result in Modification of data

3) It can erase your complete Hard drive

4) It can show annoying messages on your computer screen.


A worm is similar to a virus by design and is considered to be a sub-class of a virus. Worms spread from computer to computer, but unlike a virus, it has the capability to travel without any human action. A worm takes advantage of file or information transport features on your system

The biggest danger with a worm is its capability to replicate itself on your system, so rather than your computer sending out a single worm, it could send out hundreds or thousands of copies of itself, creating a huge devastating effect. One example would be for a worm to send a copy of itself to everyone listed in your e-mail address book. Then, the worm replicates and sends itself out to everyone listed in each of the receiver's address book

Trojan Horses :-

A Trojan horse, or Trojan, is a non-self-replicating type of malware which appears to perform a desirable function but instead drops a malicious payload, often including a backdoor allowing unauthorized access to the target's computer. These backdoors tend to be invisible to average users.

There are two main differences between Trojans and viruses or worms. Trojans can't replicate themselves or spread independently, as both viruses and worms do, and they are always created with malicious intent, while viruses and worms are sometimes benign or accidental.

Types of Trojan

• Remote Access Trojans

• Data Sending Trojans

• Destructive Trojans

• Proxy Trojans

• FTP Trojans

• security software disabler Trojans

• denial-of-service attack (DoS) Trojans

Effects of Trojan :-

Sending spam to your friend using YOUR mail

Slow (or freeze) down the computer

Might get it to crash and stop working.

Spyware :-

Spyware is usually software that is installed without the computer user’s knowledge or consent. This type of malware sends and receives information when the computer is online. This is usually poorly written software that will make a computer system malfunction. Spyware can also gather personal information that can include passwords and credit card information. One of the greatest threats that spyware brings is viruses, worms, or Trojans.

How to Avoid Getting a Computer Malware on Your Windows PC

Never click on a link or attachment in an email that you are not positive is from a trusted source

Be wary of files with a double extension such as .txt.vb or .jpg.exe.

Use USB drives with caution.

Beware of internet pop-ups.

Beware of unusual emails from companies you do business with.

Install an anti-virus program.

Install an anti-spyware program.

Use a firewall

Set up your Windows Update to automatically download patches and upgrades.

Consider switching to a different web browser

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