Well, as the name suggests, us start learning viruses, anything that happens to a computer which
results in the abnormal behavior, the common man concludes by saying that it's a virus.
Well, if you ask your friend that or even if you tell your friend it, my piece is running slow.
There are unusual pop ups on the screen, he or she, without having a knowledge of cybersecurity.
All these threads with reply virus.
The media has turned this storm into a great they have just exaggerated the virus and people who do
not will know what virus means have started using the term as a common place.
So in this lecture we will actually see what is a virus.
We will see the stages of virus, then we will see how these viruses exactly work and how and the harm
systems.
The news, he hoped was a computer get infected by viruses, but the virus can enter into the system.
So let's get started.
What is a virus?
This is a self replicating program.
Make sure that virus itself like replicating a program that produces itself to another program, computer
sector, a document.
So the characteristics of viruses are it in fact, the programs, it transformed itself that it is still
self replicating program and all those data, it corrupts files and programs.
Viruses are generally transmitted to the downloads, infected discs, flash drives and again, Emile's.
So what can be the purposes of creating viruses?
Well, viruses are created to inflict damage to competitors.
For example, if Amazon and Flipkart are two leading service provider companies and if, let's say,
play cards, still it's going on.
People are choosing move the products.
And a company may deliver a virus or credit card for temporarily disabling the website so that users
have no other option than those in on.
The next is financial benefits, ransomware attacks are the most important point here.
Attackers believe the virus encrypt data and ask for ransom in order to decrypt the data.
If the victim doesn't give money or ransom what they call to their attacker, then that might end up
deleting the data.
The next purpose of creating virus is vandalism.
That is just to, you know, defeat someone.
Then viruses can also be used to play a prank.
For example, Bob is a cool guy and now he knows how to create a virus because of the readily available
virus tools.
He just creates a virus and then sends it to his friend.
It's just a prank.
But again, that prank may result in some harmful actions on the PC then cyber terrorism, like there
are many cyber hacking organizations which are using viruses to destroy our health, healthcare systems,
financial institutions, education institutions and many.
Then distribute political messages, damaged network or computers and gain remote access to the victim's
computer.
What are the stages of a virus like?
The first one is the design developing the virus code, using programming languages or construction
kits.
And that is why, because of these readily available construction kits and even on the Internet, even
you can create a virus.
The next is a replication virus, replicate itself for a period of time within the target system.
And then the predictive power is the launch.
It gets activated with the user performing certain actions such as running and infected programs.
The fourth stage is the detection phase.
Here, the virus is identified as a threat infecting target systems.
Food is the incorporation pardon me.
Fifth is the incorporation.
Antivirus software developers assimilate defenses against the virus and the last one is execute the
damage routine users install virus updates, antivirus updates and eliminate the virus threats.
What is the working of virus?
The working of virus takes place in two phases infection phase and the attack phase.
Right.
Viruses do not directly attack the system.
First is the infect the infected the systems.
Normally a virus infects a person, let's say, up to an incubation period for the computer virus.
It starts attacking the system.
So what happens in the infection phase?
In the infection phase, the virus replicate itself and attaches to an X file in the system, which
is an executable file.
So every time and every time the victim executes the dirty file, the virus might also get executed
attack.
These viruses are programmed with trigger events to activate and current systems trigger even means
whenever the victim clicks or does something, then it will trigger the virus to do something.
It is action somewhere to infect each time they are run and others infect.
Only you in a certain predefined condition is made such as a user's specific task day, a time or a
particular event.
In the next lecture, we will see the indications of virus attacks like how can you know that your PC
has been attacked by a virus?
And then you also see what are the ways in which a computer can get infected by viruses.