Date post: | 18-Jan-2016 |
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Computer Viruses
Presented by : vijitha.k
INTRODUCTION
Virus: definition
a virus is a self replicating program. It may spread between files or disks but the defining character is that it can recreate itself without travelling to new host
Overview
How virus infect computer SymptomsClassifying Viruses ExamplesProtection/PreventionConclusion
How virus infect computer
virus can run before infect your computer
It can attach themselves to other programs
One infected attachment can copy itself to other files
Virus risks
the internet
document and spreadsheets
programs
emailFloppy disk and cds
Symptoms of Virus Attack
Computer runs slower then usual Computer no longer boots up Screen sometimes flicker PC speaker beeps periodically System crashes for no reason Files/directories sometimes disappear
Classifying Virus - Types
Trojan HorseBack door trojansWorm Boot sector virusParasitic virusMacro
Trojan Horse
CovertLeaks informationUsually does not reproduce
Worms
Spread over network connectionWorms replicateFirst worm released on the Internet was
called Morris worm, it was released on Nov 2, 1988.
Macro
Specific to certain applications Comprise a high percentage of the virusesUsually made in WordBasic and Visual
Basic for Applications (VBA) Microsoft shipped “Concept”, the first
macro virus, on a CD ROM called "Windows 95 Software Compatibility Test" in 1995
Protection/Prevention
make users aware of the risk
Install antivirus software and update it regularly
Keep backups of all your data
Sources of viruses
e mail
internet
Anti virus softwares
scanners
Check summers
heuristics
Mobile phones and palmtops
virus spread to mobiles through internet usage
Blue tooth
precaution
scanning at the gateway or during data transfer
Virus scanning on the mobile device don’t install unexpected aplication reduce downloads
Conclusion..
Questions?
Thank you….