History of Viruses is as old as the history of computer and electronics. I’ve compiled the list of most dangerous viruses of computer till date.

Most Dangerous Computer Virus

The first IBM PC virus in the wild was a boot sector virus dubbed Brain computer virus, created in 1986 by the Farooq Alvi Brothers in Lahore, Pakistan, reportedly to deter piracy of the software they had written. Now the top 3 dangerous viruses are:

1. MYDOOM

What was it:

A worm that spread through email as what appeared to be a bounced message.

How it worked:

When the unsuspecting victim opened the email, the malicious code downloaded itself and then pilfered the new victim’s Outlook address book.

How it spread:

From there, it spread to the victim’s friends, family and colleagues. It spread faster than any worm seen prior.

DAMAGES: $38,000,000,000           PCs INFECTED: 2,000,000

2. SOBIG.F

What was it:

A worm that replicates itself, but also is a Trojan, as it disguises itself as something other than malware.

How it worked:

Once the user opened the email, it triggered the worm, which then went hunting for addresses.

How it spread:

The flood of messages it then sent were capable of succumbing other users’ inboxes or computer systems by the sheer volume of emails. It briefly brought down freight and computer traffic in Washington, D.C. to a halt, grounded Air Canada and slowed down computer systems at many major companies.

DAMAGES: $37,100,000,000              PCs INFECTED: 2,000,000

3. ILOVEYOU:

What was it:

An innocent looking email attachment labeled “I Love You.”

How it worked:

When opened, it unleashed a malicious program that overwrote the users’ image files. It was designed to steal Internet access passwords.

How it spread:

The virus emailed itself to the first 50 contacts in the user’s Windows address book.

DAMAGES: $15,000,000,000        PCs INFECTED: 500,000

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