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Well, as the name suggests, us start learning viruses, anything that happens to a computer which

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results in the abnormal behavior, the common man concludes by saying that it's a virus.

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Well, if you ask your friend that or even if you tell your friend it, my piece is running slow.

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There are unusual pop ups on the screen, he or she, without having a knowledge of cybersecurity.

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All these threads with reply virus.

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The media has turned this storm into a great they have just exaggerated the virus and people who do

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not will know what virus means have started using the term as a common place.

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So in this lecture we will actually see what is a virus.

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We will see the stages of virus, then we will see how these viruses exactly work and how and the harm

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systems.

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The news, he hoped was a computer get infected by viruses, but the virus can enter into the system.

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So let's get started.

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What is a virus?

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This is a self replicating program.

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Make sure that virus itself like replicating a program that produces itself to another program, computer

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sector, a document.

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So the characteristics of viruses are it in fact, the programs, it transformed itself that it is still

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self replicating program and all those data, it corrupts files and programs.

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Viruses are generally transmitted to the downloads, infected discs, flash drives and again, Emile's.

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So what can be the purposes of creating viruses?

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Well, viruses are created to inflict damage to competitors.

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For example, if Amazon and Flipkart are two leading service provider companies and if, let's say,

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play cards, still it's going on.

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People are choosing move the products.

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And a company may deliver a virus or credit card for temporarily disabling the website so that users

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have no other option than those in on.

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The next is financial benefits, ransomware attacks are the most important point here.

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Attackers believe the virus encrypt data and ask for ransom in order to decrypt the data.

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If the victim doesn't give money or ransom what they call to their attacker, then that might end up

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deleting the data.

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The next purpose of creating virus is vandalism.

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That is just to, you know, defeat someone.

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Then viruses can also be used to play a prank.

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For example, Bob is a cool guy and now he knows how to create a virus because of the readily available

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virus tools.

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He just creates a virus and then sends it to his friend.

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It's just a prank.

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But again, that prank may result in some harmful actions on the PC then cyber terrorism, like there

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are many cyber hacking organizations which are using viruses to destroy our health, healthcare systems,

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financial institutions, education institutions and many.

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Then distribute political messages, damaged network or computers and gain remote access to the victim's

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computer.

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What are the stages of a virus like?

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The first one is the design developing the virus code, using programming languages or construction

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kits.

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And that is why, because of these readily available construction kits and even on the Internet, even

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you can create a virus.

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The next is a replication virus, replicate itself for a period of time within the target system.

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And then the predictive power is the launch.

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It gets activated with the user performing certain actions such as running and infected programs.

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The fourth stage is the detection phase.

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Here, the virus is identified as a threat infecting target systems.

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Food is the incorporation pardon me.

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Fifth is the incorporation.

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Antivirus software developers assimilate defenses against the virus and the last one is execute the

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damage routine users install virus updates, antivirus updates and eliminate the virus threats.

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What is the working of virus?

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The working of virus takes place in two phases infection phase and the attack phase.

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Right.

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Viruses do not directly attack the system.

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First is the infect the infected the systems.

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Normally a virus infects a person, let's say, up to an incubation period for the computer virus.

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It starts attacking the system.

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So what happens in the infection phase?

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In the infection phase, the virus replicate itself and attaches to an X file in the system, which

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is an executable file.

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So every time and every time the victim executes the dirty file, the virus might also get executed

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attack.

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These viruses are programmed with trigger events to activate and current systems trigger even means

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whenever the victim clicks or does something, then it will trigger the virus to do something.

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It is action somewhere to infect each time they are run and others infect.

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Only you in a certain predefined condition is made such as a user's specific task day, a time or a

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particular event.

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In the next lecture, we will see the indications of virus attacks like how can you know that your PC

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has been attacked by a virus?

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And then you also see what are the ways in which a computer can get infected by viruses.