Definition of Virus
A virus is a small piece of software that piggybacks on real programs in order to get executed.
Once it’s running, it spreads by inserting copies of itself into other executable code or documents.
- Computer virus have become today’s headline news.
- With the increasing use of the Internet, it has become easier for virus to spread.
- Virus show us loopholes in software.
- Most virus are targeted at the MS Windows OS.
Virus :
A true virus is capable of self replication on a machine. It may spread between files or disks, but the defining character is that it can recreate itself on it’s own with out traveling to a new host.There are estimated 30,000 computer viruses in existence.
Over 300 new ones are created each month.
First virus was created to show loopholes in software.
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
- Denial of Service (DoS)
Virus through the Internet
Today almost 87% of all viruses are spread through the internet (source: ZDNet).
Transmission time to a new host is relatively low, on the order of hours to days "Latent virus".
Computer Virus Timeline
1949
Theories for self-replicating programs are first developed.1981
Apple Viruses 1, 2, and 3 are some of the first viruses “in the wild,” or in the public domain. Found on the Apple II operating system, the viruses spread through Texas A&M via pirated computer games.1983
Fred Cohen, while working on his dissertation, formally defines a computer virus as “a computer program that can affect other computer programs by modifying them in such a way as to include a (possibly evolved) copy of itself.”1986
Two programmers named Basit and Amjad replace the executable code in the boot sector of a floppy disk with their own code designed to infect each 360kb floppy accessed on any drive. Infected floppies had “© Brain” for a volume label.1987
The Lehigh virus, one of the first file viruses, infects command.com files.1988
One of the most common viruses, Jerusalem, is unleashed. Activated every Friday the 13th, the virus affects both .exe and .com files and deletes any programs run on that day.
MacMag and the Scores virus cause the first major Macintosh outbreaks.
MacMag and the Scores virus cause the first major Macintosh outbreaks.
Typical things that some current Personal Computer (PC) viruses do
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