BULD BRIGHT UNIVERSITY

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Faculty of Science and Technology

Understanding Virus and Attack Techniquesប្រ�ធាន�ទ :

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Type of Computer Viruses

What is a computer virus?

• Exist over the past few years• There are over 10,000 known computer

viruses• Over 200 new viruses are being discovered

every month• hidden program, which invades your computer• Has the potential to cause damage and/or

perform unwanted/unauthorized functions.

How does a virus work?

• A computer virus performs two basic functions

– It copies itself from machine to machine (self reproducing)

– It executes the instructions the perpetrator has planned.

A computer virus exhibits three characteristics:

• a replication mechanism• an activation mechanism • an objective

What damage can a virus do?

• computer virus can cause unwanted alteration• computer virus can loss of data• annoy the user• destroy all your data files• your machine can even be rendered unusable

How do they spread?

Viruses are usually spread by media/programs swapped.

Kind of viruses

• Encrypted Viruses : most difficult kind of bug to detect and the most difficult to stop

• Secret Viruses : make changes to files on your computer, or completely replace files

• Time Delay Viruses• The Anti-Virus Virus• The Multi-Headed Virus

Kind of viruses (continue)

• The Misdirection Virus• A Cloning Virus • The Author Virus • The Bad Penny Virus • Rewriting Virus • The Melissa Virus

End Type of Viruses

How to Know if Your Computer is Infected with a Virus

Viruses in USB Flash or Drive

Show file hid from USB Flash

To unhide file in USB Flash• Run=> cmd.exe• F: or G: (Drive USB Flash) : => hit Enter• F:> attrib -s -h /s /d *.* => hit Enter

Show file hid from USB Flash

Attack Techniques

What is attack ?

In computer and computer networks an attack is any attempt to destroy, expose, alter, disable, steal or gain unauthorized access to or make unauthorized use of an asset

Unauthorized Access Attack

• Spoofing• Hopping• DoS• DDoS• Spam Mail• Malicious Code• Cross Site Scripting Attack

Spoofing

Typical example•Use of other people’s user IDs/passwords without permission

Dos Attack

Attack Cross Site Scripting Attack

Resource :

• http://en.wikipedia.org• http://www.secudemy.com• http://www.google.com• Chapter03-Unauthorized.Access.Method

Q & A

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