Viruses and its types and some examples of virus and also includes how do viruses get on your computer and what does it do.

1. AND
ITS TYPES

2. What is a Virus on a
computer?
•
•

3. What is a Virus on a
computer?
•

4. • A virus is simply a computer program--
it can do anything that any other
program you run on your computer can
do. Some viruses are designed to
deliberately damage files, and others
may just spread to other computers.
Do you wonder..

5. • Viruses infect computers discreetly, and they’re
often designed to destroy personal files or gain
control of devices. Making copies of themselves,
computer viruses spread across devices and
networks like biological viruses passing from one
person to the next. And just like the biological
versions, some computer viruses are simply
annoying while others can cause major damage.

6. • In the early days of computers, viruses were spread between
devices using floppy disks. It spread through almost any method of
file sharing, as long as the virus can avoid detection by antivirus
programs.
• Nowadays, viruses can still be spread via hard disks and Universal Serial Bus
(USB) devices, but they are more likely to be passed between devices
through the internet and by malicious online downloads.
• Computer viruses can be spread via email, with some even capable of
hijacking email software to spread themselves. Others may attach to
legitimate software, within software packs, or infect code, and other
viruses can be downloaded from compromised application stores.

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14. • Slow or stuttering performance
• Corrupted or deleted files
• Incessant pop-ups or adware
• Program failure and operating system crashes
• A constantly spinning hard drive
• Malfunctioning apps, files, and other programs
• Steal personal data — such as usernames, passwords, and credit card details
• Spam all of your contacts and try to trick them into downloading the virus

15. Common Types of Computer
Viruses

16. 1. File-infecting Virus
A virus that attached itself to an executable program.
Itisalsocalledaparasiticviruswhichtypicallyinfects
files with .exe or .com extensions. Some file infectors
can overwrite host files and others can damage your
harddrive’sformatting.

17. 2. Macro Virus
This type of virus is commonly found in programs such
as Microsoft Word or Excel. These viruses are usually
stored as part of a document and can spread when the
files are transmitted to other computers, often through
emailattachments.

18. 3. Browser Hijacker
This virus targets and alters your browser setting. It is
often called a browser redirect virus because it
redirects your browser to other malicious websites
thatyoudon’thaveanyintentionofvisiting.Thisvirus
can pose other threats such as changing the default
homepageofyourbrowser.

19. 4.Web Scripting Virus
A very sneakyvirusthattargetspopularwebsites.What
this virus does is overwrite code on a website and insert
links that can install malicious software on your device.
Webscriptingvirusescanstealyourcookiesandusethe
information to post on your behalf on the infected
website.

20. 5. Boot Sector Virus
These viruses are once common back when computers are
booted from floppy disks. Today, these viruses are found
distributed in forms of physical media such as external hard
drives or USB. If the computer is infected with a boot sector
virus, it automatically loads into the memory enabling
controlofyourcomputer.

21. 6. Polymorphic Virus
This virus has the capability to evade anti-
virus programs since it can change codes
everytimeaninfectedfileisperformed.

22. 7. Resident Virus
A resident virus stores itself on your computer’s
memory which allows it to infect files on your
computer. This virus can interfere with your
operating system leading to file and program
corruption.

23. 8. Multipartite Virus
A type of virus that is very infectious and can easily
spread on your computer system. It can infect multiple
parts of a system including memory, files, and boot
sectorwhichmakesitdifficulttocontain.

24. • Worm
• ILOVEYOU
• Stuxnet
• Welchia
• Tinba

25. • A computer worm is a type of trojan horse
malware that, unlike traditional viruses,
does not require the user's intervention to
spread from device to device. After
breaching a system, it can spread from one
computer to another without human
intervention.

26. • The ILOVEYOU virus is an overwrite virus. This
virus disguised itself as a love letter from one of its
victims' contacts and spread via email.
• It was the most damaging malware event of all time
when it occurred in 2000. In just about 10 days, it
reached an estimated 45 million users and caused
$10 billion in damages.

27. • Stuxnet is a highly sophisticated
computer worm that was designed to
attack Iran's nuclear facilities but has
since mutated and spread to other
industrial and energy-producing
facilities.

28. • The Welchia worm, also known as Nachi, is
a Nematode that deletes Blaster and fixes
the vulnerabilities that allow them to exist.
While it has no malicious intent, it does tend
to slow down computers and networks. On
August 18th, 2003, it was first reported.

29. • Tinba is a trojan that infects end-user
devices and attempts to compromise and
steal funds from their financial accounts.
The Trojan was discovered in 2012 and
initially infected thousands of Turkish
computers.

30. THANK YOU FOR
LISTENING!!
We hope you
learned something new.