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Edit Comment Close Premium member Presentation Transcript Computer Virus : Computer Virus BY Ravi Pareek 7/25/2009 1 What is a Computer Virus : What is a Computer Virus A kind of software programs produced by unknown people and harmful to the computers Some varieties of these software are the Viruses, Worms and Trojan horses 7/25/2009 2 What is a Computer Virus : What is a Computer Virus The term “Virus" is often used in common to describe all kinds of malware (malicious software) 7/25/2009 3 Damages done by Viruses : Damages done by Viruses Sometimes display unwanted messages Some tend to destroy programs or data Clog computer memory and hence sometimes result in system crashes Format hard disks, Damage programs, Delete files 7/25/2009 4 Viruses Damages done by Viruses : Damages done by Viruses Simply replicate themselves Presents text, video, or audio messages making the user know their presence Bug-ridden, and these bugs may lead to system crashes and data loss 7/25/2009 5 Virus spreading methods : Virus spreading methods A viruses can copy itself and infect a computer without permission or knowledge of the user attaches itself to other software programs or data files 7/25/2009 6 Virus spreading methods : Virus spreading methods Spreads from computer to computer when the host is taken to the uninfected computer over a network such as over the Internet or carrying it on a removable medium - a floppy disk, CD, or USB drive 7/25/2009 7 Virus spreading methods : Virus spreading methods Many viruses are existed in the Internet today and new ones are discovered every day. spread via downloaded software and data files, and email attachments, etc 7/25/2009 8 Virus spreading methods : Virus spreading methods Some old viruses are installed themselves into the disk boot sector runs when the user boot the computer from the disk 7/25/2009 9 Virus spreading methods : Virus spreading methods Some viruses spread through instant messaging A virus, in an infected machine, may send a web-address-link as a message to other contacting machines Thinking the link is from a friend (a trusted source), the recipient may sometimes follow the link to the websit. 7/25/2009 10 How Viruses are borne : How Viruses are borne Unlike biological viruses, computer viruses do not simply evolve by themselves deliberately created by programmers, or by people who use virus creation software 7/25/2009 11 How Viruses are borne : How Viruses are borne Viruses are written as research projects, pranks, vandalism, to attack the products of specific companies, to distribute political messages, and financial gain from identity theft, spyware, and cryptoviral extortion. 7/25/2009 12 How Viruses are borne : How Viruses are borne Some virus writers consider their creations to be works of art See virus writing as a creative hobby 7/25/2009 13 Releasing computer viruses is a crime in most jurisdictions Viruses can avoid detection : Viruses can avoid detection To avoid detection by users, viruses employ different deception methods They do not make themselves to change the date of last modified increase file sizes damage the files 7/25/2009 14 Viruses can avoid detection : Viruses can avoid detection They kill the tasks associated with antivirus software before it can detect them 7/25/2009 15 How Antivirus software works? : How Antivirus software works? Detect using a list of virus signature definitions comparing the files stored on fixed or removable drives (hard drives, floppy drives), against a database of known virus "signatures". 7/25/2009 16 How Antivirus software works? : How Antivirus software works? Use a heuristic algorithm to find viruses based on common behaviors Examin the content heuristics of the computer's memory (its RAM, and boot sectors) 7/25/2009 17 How Antivirus software works? : How Antivirus software works? Some anti-virus programs gives you a real time protection Examin files as they are being opened, downloaded, copied, accessed, and transmitted etc 7/25/2009 18 How Antivirus software works? : How Antivirus software works? They need regular updates in order to gain knowledge about the latest threats 7/25/2009 19 Damage prevention & data recovering : Damage prevention & data recovering Take regular backups (including OS) on different media, unconnected to the system (most of the time) 7/25/2009 20 How to prevent damages caused by viruses? Damage prevention & data recovering : Damage prevention & data recovering Use backups on optical media like CD and DVD (read-only), as they can no longer be affected by viruses. Use an OS on a bootable, to start the computer if the installed OS become unusable. 7/25/2009 21 How to prevent damages caused by viruses? Keep your computer Virus free : Keep your computer Virus free Install reliable anti-virus software the most important step you can take towards keeping your computer clean of viruses Update your anti-virus software regularly variations of viruses and new ones can be slipped if your software is not current 7/25/2009 22 Keep your computer Virus free : Keep your computer Virus free Get immediate protection Configure your anti-virus software to boot automatically on start-up and run at all times 7/25/2009 23 Keep your computer Virus free : Keep your computer Virus free Don't automatically open attachments ensure that you examine and scan email and other attachments before they run as they might contain viruses Scan all incoming email attachments Do not open any email attached files if the subject line is questionable, unexpected or the source (address) is unknown, suspicious or untrustworthy 7/25/2009 24 Keep your computer Virus free : Keep your computer Virus free Delete chain emails and junk email Do not forward or reply to any of them, they clogs up the network Some viruses can replicate themselves and spread through email as a chain 7/25/2009 25 Keep your computer Virus free : Keep your computer Virus free Be careful when downloading files from the Internet Ensure that the source is a legitimate and reputable one save all downloads to one folder and test them with your own anti-virus software before use 7/25/2009 26 Keep your computer Virus free : Keep your computer Virus free Always scan new files for viruses before you use them 7/25/2009 27 Keep your computer Virus free : Keep your computer Virus free Backup your files on a regular basis 7/25/2009 28 Keep your computer Virus free : Keep your computer Virus free If your computer is on a network, make sure you have security steps in place to prevent unauthorized users putting files on your computer 7/25/2009 29 Keep your computer Virus free : Keep your computer Virus free Take care using USB flash cards, CDs, zip and floppy disks The more computers flash cards, CDs, zip cards and floppies have been used on, the better the chance of a virus infecting them – clean them before use 7/25/2009 30 THANK YOU : THANK YOU 7/25/2009 31 You do not have the permission to view this presentation. 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