Advance Computer

Skills

Computer VIRUSModule

By: Mayday R Cruda

Objectives

• Name some Computer Virus

• List different attacks of computer viruses

HISTORYOF

COMPUTERVIRUS

1966 70’s 80’s 90’s 2000

Johnvon Newman

RABBITFork Bomb

CreeperANIMAL

ELK cloner

BRAINBoot sector

Ping Pong

Morris Ghostball

Melissa

LOVE BUG

Anna Kournikova

CODE RED

Netsky and Sasser

Storm worm

COMPUTER VIRUS

Program that spread,replicateandInterferes computer operation

How does it

AFFECTComputers?

Viruses can

• slow down your computer• corrupt your system files• make some programs faulty or corrupt• damage your boot sector• Tie up Internet traffic• turn your computer into a slave• steal important information from your computer• change the power ratings and blast your computer• worst case can make your computer unusable

Viruses behave in different ways

• Hide in the system• Replace files• Replicate files• Delete files• Run programs• Send files and info• Deny access• Reboot computers• Clog your memory

How virus spreads

Email attachmentsRogue WebsitesNetworksInfected storage disksInfected SoftwareFake Anti Virus SoftwarePirated programsFrom Mobile Devices

Different types of

Computer Virus

• Memory Resident Virus• Direct Action Viruses• Overwrite Viruses• Boot Sector Virus• Macro Virus• Directory Virus• Polymorphic Virus

• Companion Viruses• FAT Virus• Multipartite Virus• Web Scripting Virus• Worms• Trojans• Logic Bombs• Rootkits

• Memory Resident Virus• Direct Action Viruses• Overwrite Viruses• Boot Sector Virus• Macro Virus• Directory Virus• Polymorphic Virus

• Companion Viruses• FAT Virus• Multipartite Virus• Web Scripting Virus• Worms• Trojans• Logic Bombs• Rootkits

OVERWRITE VIRUS

deletes information contained in the files that it infects and sometimes reboot the system

EX. WayTrj.RebootTrivial.88.D

DAMAGE: files may be partially or totally useless

DIRECTORY VIRUS (CLUSTER)changing the path that indicates the location of a file and renaming all

executable to non-executable extensions. When you run the program, you first run the virus

EX. Dir-2 virus (creeping death)

DAMAGE: Once infected, it becomes impossible to locate the original files.

FAT virus

Damaged the part of a disk used to store all the information about the location of files, available space, unusable space, etc.FILE ALLOCATION TABLE

Ex. Link Virus

Damage: cause serious damage to computer reformat needed.

WEB scripting Virus

originated from websites used for social networking. Attached a link that could lead to other harmful sites.

SymptomsYahoo and Google search will be re-directedHomepage of web browser, desktop background often get

changed automatically

Damage: slow down the performance of the machine

Trojans• Disguise as a useful program• steal end-user information (credit card info, banks etc.)

• perform destructive harm on the target computer• download additional computer malware

Took its name From the Greek myth ‘Trojan Horse’ex. Chernobyl virus 1998

Damage: perform destructive features on the computer.

Wormsreplicates itself in order to spread to other computerssends out hundreds or thousands of copiescreating a huge devastating effect

Ex. Morris worm – worth damaged between $10,000,000 and $100,000,000 ILOVEYOU virus - Onel A. de Guzman, $5.5 billion to $8.7 billion in damages. 10% of all Internet-connected computers were hit.

Damageconsumes too much system memory(or network bandwidth), causing Web servers, network servers and individual computers to stop responding

Rootkitallow viruses and malware to “hide in plain sight” by disguising as necessary files that your antivirus software will overlookWorst case:

control your computer and turn it into ‘Zombie’

“secretly compromised by hacking tools which allow a third party to control the computer and its resources remotely”

HOW TO COUNTER

COMPUTER VIRUS

SCAN EMAIL ATTACHMENTS

USE WINDOWS FIREWALL

INSTALL A RELIABLE ANTIVIRUS

AVOID SUSPICIOS WEBSITE

WATCH YOUR DOWNLOADS

ANY

recap

Computer Virus• Memory Resident Virus• Direct Action Viruses• Overwrite Viruses• Boot Sector Virus• Macro Virus• Directory Virus• Polymorphic Virus

• Companion Viruses• FAT Virus• Multipartite Virus• Web Scripting Virus• Worms• Trojans• Logic Bombs• Rootkits

Viruses can

• slow down your computer• corrupt your system files• make some programs faulty or corrupt• damage your boot sector• Tie up Internet traffic• turn your computer into a slave• steal important information from your computer• change the power ratings and blast your computer• worst case can make your computer unusable

END