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Computerviruses

Computerviruses. Created by: Zoltán Homoki. It operates just like a real virus It destroys Frideric Cohen made the first virus in 1983 They wanted to use it in the army The result was shocking. Definition of viruses. Enter to the system without permission Can reproduce itself

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Computerviruses

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  1. Computerviruses Created by: Zoltán Homoki

  2. It operates just like a real virus • It destroys • Frideric Cohen made the first virus in 1983 • They wanted to use it in the army • The result was shocking

  3. Definition of viruses • Enter to the system without permission • Can reproduce itself • Destroy if the conditions materialize

  4. Why are they noxious ? • Use lot of source of energy • Cause program or data losing • Cause detriment • Need to work with itself

  5. Groups of the noxious programs • Viruses : - system virus - program virus - application virus • Other noxious programs : ( spyware, trojan horses, worms, ZIP-bomb, mutation viruses, hoax viruses ect. )

  6. System viruses • It starts first (before the loading of the operation system) • It attacks the Master Boot Record • Prevention: - Checking of the MBR ( you can adjust it in the BIOS ) - Use anti-virus program • Restoration: FDISK/MBR, anti-virus program

  7. Program virus • The virus can infect these files : - ( exe, com, sys, dll, pif, dot ect.) • The parts of the computer virus: - reproduction routine - activation routine - objective ( punitive ) routine

  8. Program virus

  9. Groups of the computerviruses according to : • Generations • Speed of infection • Objective ( punitive ) routine • Place ( in memory, in file )

  10. According to generations • First generation virus (simple spreading, easy decoding) • Stealth virus ( all is shown uninfected ) • Mutation virus ( while spreading it can change itself)

  11. According to speed of infection • Viruses with slow infection : - just one or two victim • Viruses with fast infection : - it infects all opened files

  12. According to objectiv routin • Destroyer : - physically destroying - strongly destroying - partially destroying - selectively destroying • Not Destroyer : - show a text, a music, a picture - change the keys on the keyboard - there is not objective routin in it

  13. According to place • Resident: ( it there is in the memory till the computer is running ) • Not Resident • Mixed: ( objective routine resident, reproduction routine resident )

  14. Other noxious programs • Trojan horse ( Backdoor virus ): - It masks itself a normal program - It opens a backdoor in the operation system • For example.: SubSeven, NetBus, Backdoor.Amasso ect.

  15. Other noxious programs • Worm : - It use the operation system’s mistakes - It want to get information - It is not deleted - Just the operation system’s mistakes are fixed

  16. Other noxious programs • Virusgenerator : - You not have to be a programmer

  17. Other noxious programs • IN THE WILD ( ITW ) virus : • Circulates on the Internet • It is the most dangeruos

  18. Other noxious programs • ZOO - virus : • These viruses are made in the laboratories • It helps with making of better anti-virus software • There aren’t perfect anti-virus programs

  19. Other noxious programs • Hoax – virus : - These viruses make defective reports - They can’t cause mistakes

  20. Other noxious programs • ZIP- bomb : • In fact it is a very huge file • It is packed excellently • 1050 piece A type

  21. Other noxious programs • Spyware : ( Adware, Keylogger ) • Collectes information about you and your habits • Causes trouble ( frost the system, starts the IE with unknown home page, popup windows, strange icons on the desk ) • They are in Freeware and Shareware programs

  22. Adware • In the most of case its serves the aim of advertisment • Sends pieces of information about the users

  23. Keylogger • It can watch what you do on the computer • It registers the pressed down buttons • It sends the information to the sender • For example: BigBrother. FamilyCam

  24. Other noxious programs • SPAM: • Undesirable advertisment e-mails • The quantity of spam mails always grow • The e-mail traffic’s 75 per cent is spam - It is expensive to filter the spams

  25. Tricks of the spam senders • Open – relay ( mail server ) • Proxy server • WEB BUG • SPAM mails cheat the spam filters

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