A complete guide to learn the history of computer viruses. A virus is a malware program that infects the computers to steal information from users. Download Free Antivirus here: Useful Resource: https://antivirus.comodo.com

1. History of Computer Virus

2. Introduction to Computer Virus
Definition:
A virus a type of self-replicating malware program
that spreads from one computer to another.
Malware:
It is a blanket term used to describe all
harmful files, including virus.

3. The Interesting History of Virus
1981 - “Elk Cloner” strikes Apple DOS. It showed a
poem on the computer screen.
1986 - Two Pakistani brothers wrote a code called
“Brain” to protect their medical software. It
replaced a floppy's boot sector and disk label
with it's name in IBM PCs (MS DOS).
1990 – Ralf Burger develops “Chameleon,” the first
ever polymorphic virus. Same year, Symantec
launches Norton Antivirus, the first
commercially available AV.

4. The Interesting History of Virus
1999 – Happy99 attaches to emails with a Happy
New Year message; affects Windows 95 and
Windows 98.
2000 – ILOVEYOU virus hits computers and deletes
JPEGs, MP2, and MP3 files.
2001 – Anna Kournikova virus spreads through
Microsoft Outlook and sends malicious files to
people in compromised address book.

5. The Interesting History of Virus
2006 – OSX/Leap-A becomes the first known
malware discovered in Mac OS X.
2007 – Zeus Trojan steals login credentials from
banking websites and commits financial
fraud.
2008 – Koobface targets Facebook and MySpace
users.
2013 – Cryptolocker ransomware encrypts files and
demands a ransom to unlock files.

6. Types of Virus

Trojan disguises itself as a normal file to trick
users into downloading it.

Potentially Unwanted Programs (PUPs) installs
itself on target computers without a user's
consent.

Adware bombards computers with unsolicited ads
when victims browse the internet.

Spyware hides in a user's browser and collects
important data stealthily.

7. Cost of Damage

ILOVEYOU (2001) virus inflicted a global loss of
$15 billion.

Sobig virus (2003) wreaked havoc over $37
billion.

Mydoom (2004) virus caused a loss of $38
billion.

8. Scale of Damage

32% of computers worldwide are infected with
some kind of virus.

As of 2014, over 30% of households in the
US were infected by malware.

China ranks first in the list of top ten
countries that have the worst case of virus
infection.

9. Virus Prevention & Safety Measures

Make a habit of browsing secure https:// websites

Install and keep antivirus & firewall (or an
internet security suite that has both) turned on

Keep all software up-to-date

Back up your data

10. Virus Prevention & Safety Measures

Don't open attachments or click on links coming through
suspicious emails

Use public wi-fi networks with caution

Be wary of file-sharing websites

Perform monetary transactions only through trusted
payment gateways

11. How to Remove Virus?
1. Restart PC in Safe Mode
2. Delete Temporary Files
3. Download Comodo Free Antivirus and run a scan
4. Delete and uninstall unauthorised programs
5. Fix browser settings and connections

12. Useful Resources
Malware Search Engine – https://file-intelligence.comodo.com/
What is Antivirus Software -
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