There are very much case about virus, worm or Trojan horse. Example: macro virus which are infected word document or Jpeg picture. Virus CIH is made to break BIOS system, this virus has broke thousand computers in the world.
Virus Mail my Love which are made many people afraid about this, and these have been found very much. Example of biggest cases: Worm limda, Code red, and sircam with their variant which are made a site and LAN enterprise in the world stagnant. The worms make a false communication.
In the beginning 2003, Worm Slammer, just need 10 minute to make chaos internet user. In first time of their spreading, amount of worm increase two times every 8,5 second. The speed is quicker than Code red which spread 18 month and increase amount two times every 37 minutes.
How they are infected computer?
Disk : this media always help virus to spread, flash disk or floppy disk.
E-mail : by attachment method, an virus can enter to computer when we click attachment of our email. Virus usually adheres in word document, or picture document, without suspicious.
Download: usually we download software from internet, especially download from unknown site. The possibility is very big, we are infected by virus, worm or Trojan.
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