Worst Computer Viruses Part 2

Apr 10, 2017 | IT Services

Part two of some of the worst computer viruses ever created.

Worst Computer VirusesCode Red and Code Red II

Code Red and Code Red II are worms that exploit vulnerabilities on machines running Windows 2000 and Windows NT. The payload of the worm included defacing the affected website display, trying to spread itself by looking for more IIS servers on the internet, and launching denial of service attacks on several fixed IP addresses.


A file was infecting computer worm that utilizes several types of propagation techniques, and this caused it to become the most widespread virus/worm within 22 minutes, surpassing the economic damage caused by previous outbreaks such as Code Red.

SQL Slammer/Sapphire

A computer worm that caused a denial of service on some Internet hosts and dramatically slowed down general Internet traffic. It spread rapidly, infecting most of its 75,000 victims within ten minutes.


MyDoom is a computer worm affecting Microsoft Windows that became the fastest-spreading e-mail worm ever exceeding records set by the ILOVEYOU virus.

Leap Worm

The Leap Worm arrives over the iChat instant messaging program, and for the worm to take effect, the user must manually invoke it by opening the tar file and the running the disguised executable within.

Storm Worm

A backdoor Trojan horse that affects computers using Microsoft operating systems that began attacking thousands of computers in Europe and the United States using an email message with a subject line about a recent weather disaster.

Elk Cloner

One of the first known microcomputer viruses created that spread outside the computer system or laboratory. Designed as a prank by a 15-year-old high school student, Elk Cloner attached itself to the Apple II operating system to spread by floppy disk attached to a game.


The first multipartite virus that infects both executable.COM-files and boot sectors on MS-DOS systems, capturing specific information entered or saved by the user.

The Michelangelo Virus

A virus designed to infect DOS systems. The virus overwrites the first one hundred sectors of the hard disk with nulls, and while the user’s data would still be on the hard drive, it is irretrievable for the average user.

Pikachu Virus

A computer virus geared at children distributed via email with the message “Pikachu is your friend.” Within the broadcast is a program that adds a command to remove contents of directories at a computer’s restart.

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