The first computer virus

Prank starts 25 years of security woes

Excerpt:

What began as a ninth-grade prank, a way to trick already-suspicious friends who had fallen for his earlier practical jokes, has earned Rich Skrenta notoriety as the first person ever to let loose a personal computer virus.
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"Elk Cloner" — self-replicating like all other viruses — bears little resemblance to the malicious programs of today. Yet in retrospect, it was a harbinger of all the security headaches that would only grow as more people got computers — and connected them with one another over the Internet.

Skrenta's friends were already distrusting him because, in swapping computer games and other software as part of piracy circles common at the time, Skrenta often altered the floppy disks he gave out to launch taunting on-screen messages. Many friends simply started refusing disks from him.

So during a winter break from the Mt. Lebanon Senior High School near Pittsburgh, Skrenta hacked away on his Apple II computer — the dominant personal computer then — and figured out how to get the code to launch those messages onto disks automatically.

He developed what is now known as a "boot sector" virus. When it boots, or starts up, an infected disk places a copy of the virus in the computer's memory. Whenever someone inserts a clean disk into the machine and types the command "catalog" for a list of files, a copy gets written onto that disk as well. The newly infected disk is passed on to other people, other machines and other locations.

Comment: Symantec and McAfee should pay this guy! Here's the Source for it (harmless!)