07-12-2012, 02:34 PM
Computer Virus
Computer Virus[.ppt (Size: 477 KB / Downloads: 28)
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
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
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
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
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
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.
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