understanding viruses

7/28/2019 Understanding Viruses

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Understanding Viruses


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Computer Viruses

A true virus can only spread from one computer toanother in some form of executable code when its host is

taken to the target computer; for instance because a user

sent it over a network or the Internet, or carried it on a

removable medium such as a floppy disk, CD, DVD, orUSB drive.


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How Computer Viruses Work

i. Infection Phase:

ii. Attack Phase:


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Different Types of Computer Viruses

1) Resident Viruses

2) Direct Action Viruses

3) Overwrite Viruses

4) Boot Virus

5) Macro Virus

6) Directory Virus

7) Polymorphic Virus

8) File Infectors

9) Companion Viruses

10) FAT Virus


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Popular Viruses

1) Anna Kournikova

2) Autorun

3) Michelangelo


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WORMS

In a computer, a worm is a self-replicating virus thatdoes not alter files but resides in active memory and

duplicates itself.


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Types of Worms

a) Email Worms

b) Instant Messaging

Worms

c) Internet Worms

d) IRC Worms

e) File-sharing Networks

Worms


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Some Popular Worms

1) ILOVEYOU

2) Melissa

3) My Doom

4) Conficker


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Trojans

A Trojan infection can allow total remote access to yourcomputer by a third party.


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Objectives of Trojans

Using the Trojaned machine as part of a Botnetto stage another attack like DDOS etc.

Trojans can install Softwares so that they canupload or download files and data directly from

your computer. Trojans can modify or delete your files.

Trojans also supports Keystroke logging andthey can monitor people without theirknowledge.

Wasting computer storage space.

Crashing the computer.


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Types of Trojan

i. Remote Access Trojans

ii. Password Sending Trojans

iii. Key loggers Trojans

iv. Proxy/Wingate Trojans


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Name of The Trojan Software

i. Net Bus

ii. Subseveen

iii. Beast

iv. Prorat

v. Poison Ivy

vi. Turkojan


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Malwares

Malware is a category of malicious code that includesviruses, worms, and Trojan horses. Destructive malware

will utilize popular communication tools to spread,

including worms sent through email and instant

messages, Trojan horses dropped from web sites, andvirus-infected files downloaded from peer-to-peer

connections. Malware will also seek to exploit existing

vulnerabilities on systems making their entry quiet and

easy.


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Some Famous Malware

i. Stuxnet

ii. ZeuS 2.0


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Spyware

Spyware is software that sends your personal informationto a third party without your permission or knowledge.

This can include information about Web sites you visit

or something more sensitive like your user name and

password.


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Name of Spywares

1) CoolWebSearch

2) Internet Optimizer

3) Key Logger

i. Hardware Key-Logger

ii. Software Key-Logger


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Some Famous Software Key-Logger

i. Ardamax Keylogger

ii. Actual Spy Keylogger

iii. Spytector Keylogger

iv. Ultimate Keylogger


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THE END

understanding viruses

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