Worst computer viruses in history ever


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Since the beginning of computing for the masses, a number of viruses have been released. Today, nearly one million viruses are in circulation and thousand are created every month. List of a popular and worst computer virus:

1. The Morris worm (1988):

First of all, In 1998 Robert Morris, a university student, surreptitiously released a worm which was distributed over the internet. The worm affected nearly 10 percent of all the computers connected to the internet. It was the first computer worm to be released and gained significant media attention.
It was the first virus to infect MS Word documents. Morris later became an associate professor at MIT.

2. I Love You (2000):

The “I Love You” virus spread when it was downloaded as an attachment from e-mail. Then it would start replicating itself and hiding in the folders on the hard drives.
It did nearly $10 billion worth of damage, rapidly infecting several systems around the world.

3. Nimda (2001):

NIMDA is ADMIN spelled backward.

This virus first hit the internet on 18 September causing traffic slowdowns. Within 25 minutes of its release, it had become the most widespread worm on the internet. It broke into systems with Microsoft’s web servers, furthermore infected email and sent itself out to mail contacts.
It emerged one week after 9/11 leading to a speculation that it was created by state actors or even terrorist groups.

4. Slammer (2003):

It caused a denial of service attacks on internet hosts, which drastically slowed down the internet traffic, infecting most of its 75,000 victims within ten minutes.
While only in first Fifteen minutes, it had affected no less nearly half of the servers that hold up the internet.

5. Storm Trojan (2007):

It spread through an email attachment and overwhelmed thousands of computers creating a huge global network of computers enslaved.
Each computer would then try to affect other computers.Most noteworthy It had affected up to 10 million CPUs. Later on, it was eventually contained by antivirus companies.

6. Cryptolocker (2013):

Cryptolocker would freeze up users’ personal files including photos and documents, and demand a ransom in order to release them. Its encryption method was considered unbreakable as a result within a 3 month period a total of $27 million ransom was paid.
Later on, an encryption key was discovered and posted online. Nevertheless, it generated various clones that are still active today.


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