First Computer virus
A virus (Vital Information Resources Under Seize) is a type of malicious software program (“malware”) that, when executed, replicates itself by modifying other computer programs and inserting its own code. When this replication succeeds, the affected areas are then said to be “infected” with a computer virus.Computer viruses currently cause billions of dollars’ worth of economic damage each year, due to causing system failure, wasting computer resources, corrupting data, increasing maintenance costs, etc. In response, free, open-source antivirus tools have been developed, and an industry of antivirus software has cropped up, selling or freely distributing virus protection to users of various operating systems.Creeper was an experimental computer program written by Bob Thomas at BBN in 1971. Its original iteration was designed to move between DEC PDP-10 mainframe computers running the TENEX operating system using the ARPANET, with a later version by Ray Tomlinson designed to copy itself between computers rather than simply move.This self-replicating version of Creeper is generally accepted to be the first computer worm.
Creeper was possibly one of the first programs that resembled an Internet worm. It ran on the old Tenex operating system and spread through the ARPANET, a predecessor of the current Internet. Creeper caused infected systems to display the message “I’M THE CREEPER : CATCH ME IF YOU CAN.”. Not only was Creeper the first rogue mobile program, but another version of it was created that could be considered the first worm, as it would spread, leaving copies of itself. Yet another similar program was created to fight the Creeper infections, named Reaper, which was the first nematode.
The Creeper program would start to print a file, but then stop, find another Tenex system, open a connection, pick itself up and transfer to the other machine (along with its external state, files, etc.), and then start running on the new machine. The program rarely if ever actually replicated itself, rather it “jumped” from one system to another. Infected systems display the text “I’M THE CREEPER : CATCH ME IF YOU CAN.”.