Group name

COMPUTER VIRUS

Group members Vidyash .B (co-presenter) Rohit .M (helper) Hrishikesh . W (Leader) Nishant .R (Editor) Saklen.A Sreyash G

Virus Founder

The first computer virus popularly known as the 'Brain virus' was created in 1986 by two Pakistani brothers Amjad and Basit Farooq Alvi

Computer Virus

Types Of Computer Viruses.Computer viruses can be classified into various categories , as listed

here.Boot Sector Virus

Program VirusStealth Virus

Multipartite VirusMacro Virus

Virus types

What is a computer virus ? A computer virus is a malware program that, when executed, 

replicates by inserting copies of itself (possibly modified) into other computer programs, data files, or the boot sector of the hard drive; when this replication succeeds, the affected areas are then said to be "infected".[1][2][3][4]Viruses often perform some type of harmful activity on infected hosts, such as stealing hard disk space or CPU time, accessing private information, corrupting data, displaying political or humorous messages on the user's screen, spamming their contacts, logging their keystrokes, or even rendering the computer useless. However, not all viruses carry a destructive payload or attempt to hide themselves—the defining characteristic of viruses is that they are self-replicating computer programs which install themselves without user consent.

What a Computer virus does

A computer virus might corrupt or delete data on your computer, use your email program to spread itself to other computers, or even erase everything on your hard disk. Computer viruses are often spread by attachments in email messages or instant messaging messages

How a computer virus spreads

Computer viruses usually spread in one of three ways: from removable media; from downloads off the Internet; and from e-mail attachments. Although the Internet gets a bad rap as a source of viruses, you're no more likely to contract a virus from the Web than you are from packaged software

Types of computer virus

Boot Sector Virus Program Virus Stealth Virus Multipartite Virus Macro Virus

Boot-sector viruses infect computer systems by copying code either to the boot sector on a floppy disk or the partition table on a hard disk. During startup, the virus is loaded into memory. Once in memory, the virus will infect any non-infected disks accessed by the system

A computer virus is a malware program that, when executed, replicates by inserting copies of itself (possibly modified) into other computer programs, data files, or the boot sector of the hard drive; when this replication succeeds, the affected areas are then said to be "infected"

In computer security, a stealth virus is a computer virus that uses various mechanisms to avoid detection by antivirus softwareA stealth virus is complex malware that hides itself after infecting a computer. Once hidden, it copies information from uninfected data onto itself and ..

A multipartite virus is a computer virus that infects and spreads in multiple ways. The term was coined to describe the first viruses that included DOS executable files and PC BIOS boot sector virus code, where both parts are viral themselves

WORMS A computer worm is a standalone 

malware computer program that replicates itself in order to spread to other computers.[1] Often, it uses a computer network to spread itself, relying on security failures on the target computer to access it. Unlike a computer virus, it does not need to attach itself to an existing program.[2] Worms almost always cause at least some harm to the network, even if only by consuming bandwidth, whereas viruses almost always corrupt or modify files on a targeted computer

TROJAN HORSE

A Trojan horse, or Trojan, in computing is any malicious computer program which misrepresents itself as useful, routine, or interesting in order to persuade a victim to install it. The term is derived from the Ancient Greek story of the wooden horse.[1][2][3][4][5]

PREVENTING VIRUS INFECTION

A computer virus is program code which 'hides' in other files and can cause irreparable damage to your computer. Computer viruses spread easily between computers when people pass files to each other Virus Checkers (software programs) provide protection against viruses, new and old. However, virus writers are all too ingenious and for every block that the virus protection developers put in place, virus writers are devising new code to create nuisance. This user guide provides you with information about the steps you can take to reduce the likelihood of your computer getting infected with a virus.

ANIT – VIRUS SOFTWARE

You should always ensure that you have an anti-virus software installed and enabled on your computer. This type of software can detect and block viruses before they have a chance to cause any harm. A good anti-virus program can scan for viruses on your hard drive or any program, files, or documents. If it finds any viruses, it can remove the virus, quarantine it or delete the file safely from your computer.

Worlds best anti – virus of 2015

VIPRE 1 ST

ESET 2th AVG 3th AVIRA4th NORTON 5th

KASPERSKY 6th

BITDEFENDER 7TH

AVAST 8TH

MCAFEE 9TH

PANDA 10TH

NORTON ANTIVIRUS (NAV) Norton anti virus (NAV)is product of Symantec

corporation and is one of the most widely used anti-virus programs . Using Norton Antivirus ,you can scan files .folder or entire drive for viruses if any type of computer threat is found on a computer theft is found on a computer system, this anti-virus software removes it and disassociates its action. Norton anti –virus software removes viruses, Trojan horses and worms from a computer system it also checks incoming and out coming e-mail attachments for viruses

Scanning and removing

To find and remove viruses (if any)from your computer using Norton anti virus ,follow these steps

1. Start the Norton anti virus program from the start menu.

OR

Double click the icon ( ) on the Destop,the Norton Anti Virus main windows appear

2. Select the scan for viruses option to start the virus check The scan For Viruses windows appears

3. If you choose to scan My computer, all the removable drives or all the floppy disks, the scanning

Start automatically. If you choose to

scan drive , folders or files, dialog box appears in which choose the drives , folders or files to scan . the various

scanning options and their functions are discussed in table 6.1

Scanning option function

Scan my computer Checks all boot records and files on a computer

Scan all removable drives Checks all the removable drives like floppy drives CD drives, etc

Scan all floppy disks Checks all floppy disks

Scan drives Checks the selected hard disk and / or removable drive

Scan folder Checks the selected folder

Scan files Checks the selected files

Select any one of the given options to launch a scan . For example to scan a folder on hand disk for viruses, click the Scan Folders dialog box appear

4. Select the folder and click Scan .the

Scanning process starts and the scan process starts and

the scan

Progress window displays the status of

The scan.

5.If a virus is found ,a norton ANtiVirus alert appears on the scrren giving the information about the virus

6. After the scanning is completed , Norton Anti-virus displays a summary of the scan.

7.Click Finished to close the main windows

Repair Wizard

After antivirus defects the virus , it can Remove the virus in any of this three

different ways• Fixing the infected file: this deletes the

virus and repairs the infected file .It is the best way to remove a virus.

• Deleting the infected file: this delected both t he virus and the infected file. If norton anti-virus program cannot repair the infected

OBJECTIVE TEST

1. What is mean by the anti-virus ? The software which is use for the deleti

ng the virus The software which is use for the insert

the virus