Basic Computer Viruses

Signs Your Computer is Infected

• Functions slower than normal
• Responds slowly and freezes often
• Restarts itself often
• See uncommon error messages, distorted menus, and dialog boxes
• Notice applications fail to work correctly
• Fail to print correctly

Computer Virus History

First half of the 70'Late 60,s, early 70,s- "Rabbits" cloned themselves occupied system resources, slowing down the productivity. 

• First half of the 70'Late 60,s, early 70,s- "Rabbits" cloned themselves occupied system resources, slowing down the productivity. 
• -"The Creeper"  capable of entering a network by itself and transferring a copy of itself to the system.
• Early 80,s-Increasing number of programs written by individuals not by software companies. Programs caused miner viruses called "Trojan horses".
• 1986'Brain virus' - by Amjad and Basit Farooq Alvi.
• spread through floppy disks,
• infected boot records and not computer hard drives
• Lahore, Pakistani Brain, Brain-A and UIUC virus