computer viruses

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By: mythdust (109 month(s) ago)

Hi Sir!! your presentation is so nice, may i have a copy of this Sir?

By: pak92 (109 month(s) ago)

its infected not infested my mistake

By: tweetty (92 month(s) ago)

good day sir i like your ppt, may i have this copy of this Sir.., if its okay to you??

 

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COMPUTER VIRUSES:

COMPUTER VIRUSES

WHAT IS A COMPUTER VIRUS?:

A Computer Virus is a program that may disturb the normal working of a computer. CHARACTERISTICS OF A COMPUTER VIRUS: the ability to replicate itself . the ability to attach itself to another computer file. WHAT IS A COMPUTER VIRUS?

WRONG USE OF TERM COMPUTER VIRUS:

The term "computer virus" is often used incorrectly as a catch-all phrase to include all types of Malware such as Computer Worms , Spyware , Adware , and Root kits - all of which are slightly different than Computer Viruses . WRONG USE OF TERM COMPUTER VIRUS

WORKING OF COMPUTER VIRUS:

A Computer Virus needs another program in order to be able to be activated and infect other computers files. For example, a virus might attach itself to a spreadsheet program. Each time the program runs, the virus runs too. A file containing virus is called infested file. WORKING OF COMPUTER VIRUS

Types of COMPUTER viruses :

Boot viruses Affects boot sector of a floppy or hard disk. Program viruses Infect executable program files. Multipartite viruses A hybrid of Boot and Program viruses. Directory Virus Directory viruses change the paths that indicate the location of a file Types of COMPUTER viruses

Types of COMPUTER viruses:

Stealth viruses Use certain techniques to avoid detection. Macro Viruses I nfects the macros within a document or template. Polymorphic viruses Encrypt its code in different ways Metamorphic viruses Rewrite themselves each time they infect a new file. Types of COMPUTER viruses

WHAT CAN VIRUSES DO?:

Format hard disk Copy, rename and delete files Modify files dates and extensions Display false message every few times Damage data Damage software WHAT CAN VIRUSES DO?

SYMPTOMS:

Computer runs slowly Random restarts U nknown and uninstalled icons on desktop Icons change in appearance System memory and disk space is reduced New windows open up at an alarming rate Error messages on regular basis Files mysteriously disappear SYMPTOMS

How virus spreads?:

Email Opening and downloading an email containing virus Networks Connecting with network that contains virus Removable Storage Media Floppy discs, CDs and flash devices Pirated Software Installing pirated software that contains virus How virus spreads?

WHO CREATES VIRUSES AND WHY?:

Common people: For fun Release anger Take revenge For fame Profit earners: Antivirus market Info attackers: Disrupt enemy’s information and network WHO CREATES VIRUSES AND WHY?

How to protect from virus?:

Latest antivirus should be installed Antivirus software must be upgraded regularly Unknown emails should not be opened Unauthorized software should not be installed Removable storage media should be scanned Freeware and shareware software from internet should be checked before installing How to protect from virus?

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