If you access to the computer or a smartphone, you must be aware of viruses. And since you are reading this article you must be reading it on your smartphone or your personal computer, so you are aware of what is a computer virus. And there are high chances that you have gone through the frustration of deleting that either slowed down your system or other irritating things like showing ads all over the desktop. But how do we define virus? A computer virus is a malicious program with an evil intention. It could either clean out the information on your hard drive, could connect to other network and be a part of zombie network for DDoS purposes.
A computer virus is not a new concept. It was first made in Pakistan in 1986 and was known as Brain Virus. The Brain was a boot sector virus and only infected 360k floppy disks. But nowaday more and more destructive viruses are made on a daily basis. So let’s look at the top 10 most destructive computer virus ever int the history of computers.
I love You possibly the most dangerous virus ever that had a feature of replicating itself like a worm. This virus sends traveled through email attachments and had the capability to crash a computer. It had crashed computer all over the world. The creative part of the makers was the name given to it. Since it was called, I LOVE YOU, and so they used the subject name as Love from your secret admirer. The attachment with the name was given LOVE-LETTER-FOR-YOU.TXT.vbs. The moment someone opened the file, the virus emailed itself to the first 50 contacts available in the PC’s Windows address book. The virus induced a total damage of around $10 billion affecting almost 10% of the world’s PCs connected to the Internet.
Melissa was the first email bombing macro virus for the new age of e-mailing which became the breaking news across the world on March 26, 1999. Based on a Microsoft Word and built by David L, Melissa was spread in the form of an email attachment by the name “list.doc.” When the attachment was clicked, the virus replicates itself and seeks for the Microsoft Outlook address book to e-mail itself to the first 50 names on the list with a message, “Here is that document you asked for…don’t show anyone else. ;-)” But later, FBI arrested David L and charged a fine of $5000 for making the fastest virus of that time.
This malicious program, which is also recognized as Sapphire, was originated in 2003. It infected around 75,000 hosts within 10 minutes. It also affected services of the Bank of America’s ATMs, Seattle’s 911 emergency response system, and the Continental Airlines. The cost of damage caused by SQL Slammer was around 1.2 billion dollars.
4. Code Red
Zeus or Zbot is Trojan horse package for all sorts of Windows version. It could be used for many malicious purposes but the most often it was used for man in the browser keystrokes logging. That means whatever credential you will pass to the server through your browser, it will go to a third party(Hacker), and then it will be forwarded to the server. So all your credentials like your credit card number, your email account, and passwords, all are being sent to a hacker. It was first identified in 2009 and had managed to infect millions of computer.