top 10 viruses


10. Nimda

This virus dominates the admin of the system and this special feature has rendered the creator to address it with admin spelled from backward, thereby addressing the virus as Nimda. The specialty of this virus is to slow down the internet traffic thereby considerably hampering the business. The main targets are banking institutions, government undertakings, PSU’s, however, through emails, server vulnerabilities, file and folder transfer, the receiving device is also affected. So, it leads to infection impacting a larger niche. This virus was launched in 2001 and it was believed that the virus was an outcome of some cyber terrorism attack since it came just after 9/11 incident.

9. Conficker

Breaching the safety and security in 200 countries in 2009 and infecting 15 million Microsoft operating system, this virus program primarily targeted the government, business and home computers. The virus was planted in different systems through hard drives, smart phones and it created corrupt files in the host device for its multiplication and led to identity theft, financial data loss and cyber espionage. The most important quality of this virus was that it exploited the lacunae in the Microsoft to ensure its infection.

8. Storm Worm

Storm Worm-A Trojan Horse backed virus program wreaked havoc in 2006 and it came with the message “ 230 dead as storm batters Europe”, and from there it inherited the name storm worm. The virus created links on the computer screen and whenever the recipient clicked on any of those links, then the system was infected with this virus. So, whenever clicks were generated, the botnet allowed the creator to get access to that system and that helped the creator to send spam mails on innumerable platforms for further dissemination of the virus. It impacted almost 10 million PC’s across the globe.

7. CIH

CIH owes a $250 million bill to the world—CIH or also knows as “Chernobyl” inflicted a $250 million loss when it wreaked havoc in 1998 in Taiwan. This virus primarily targeted Windows 95 and 98 and took shelter in the system as executable files. The specialty of this virus was that it pay loaded a corrupt program in the system and overwrote the Flash BIOS Chip.  So, once the BIOS chip turns defunct, in that case, the user will not be able to boot or reboot the system. So, once this virus impacts the BIOS chip then you need reprogramming to restore the computer.

6. Melissa

Melissa- a mass mailing virus program obliterated the security and safety among millions of computers on 26th March, 1999. This virus was named as the fastest mass mailing virus and it led to a colossal loss of some $600 million. The culprit, David L. Smith, responsible for developing this virus was intercepted and apprehended subsequently by FBI and imposed with a fine of $5000 dollar along with 20 month of stay at a federal prison. The virus created a chain reaction in the system and consecutively used to send 50 mails to the first 50 person in the contact list for further dissemination. The mail read as “here is the document you asked for, don’t show anyone else” thereby striking the chord of curiosity in the takers.

5. SQL Slammer

Designed to bring down the traffic—SQL Slammer, a malicious software program infected 75000 vulnerable host in the year 2003. This virus randomly attacked the IP hosts and brought their network down on the knee. It was designed and developed primarily to attack the entire host of IP networks rendering them defunct for a while. The worst effect of this virus was seen in South Korea where online work or computer networks remained shut for 12 odd hours. Some of the sole takers that found “business not usual” on account of this virus are Bank of America, Seattle 911 Emergency Response System and Continental airlines. If one has to provide in figurative tone the amount of loss that this virus generated, in that case, it will take you by storm as the loss was to the tune of $1.2 billion on account of hindrance in productivity. As the virus was launched on a weekend, the impact was shortened as it was severely dealt with, however, had the incidence happened on any of the busy working days, in that case, the loss would have been well beyond one’s imagination.

4. Code Red

The name of this virus was justified when it wreaked havoc on the summer of 2001. This virus led to a whopping loss of $ 2.6 billion and White House servers were the worst affected along with other 400 million servers. The reason that this virus is placed on the fourth spot in the top 10 list is it doesn’t require the host to open the file or folder, or open the documents, rather, it just needs an active internet connection from where it can infect the host and the system through IP coding and decoding. The virus popped a message every time when the host was affected—“Hacked by Chinese!”

3. Sobig F

In August 2003, one of the worst viruses were launched and it represented the erstwhile Sobig clan, but this time the virus was much more developed and lethal. This virus impacted household and commercial PC’s through emails and made the receiver believe that it is from an authentic source.  So, when ignorant users were lured and they opened the file, at that point of time, the virus created a passage breaching through the walls of security and it extorted some $ 4 billion by infecting 2 million PC’s worldwide.


If you were the victim of this virus “I Love You”, in that case, these three words that are considered the sweetest words ever might have given you the most bitter experience. This computer malware was detected in 2000 and the reason that it become so popular was because of the emotional chord that it struck. Basically, it impacted those individuals that were longing for love and they were desperate to be loved. The virus came in the form of word file and it read as love letter for you.  So, no sooner the recipient out of curiosity opens the file, at that point of time, the virus flexes it muscles and sends email to 50 recipients in the email list straightway. The address book of the window along with crucial details stored in the computer was compromised. This virus inflicted a larger hole in the pockets of all those victims that experienced it for the first time and the total loss from this virus stood at $5.5 billion.

1. My Doom

Considered as the most lethal virus that was ever released, “My Doom” wreaked havoc on bright winter days on January 26th, 2004. The virus categorized as malware brought the system servers on their knees. The virus dissemination was very fast and just within seconds post its launch, it affected some two million computers and led to severe degree of espionage and identity thefts. No scams and alerts could even be generated even by the strongest anti-virus solution. This virus once penetrating the system employed a smart gimmick. So, if any of the user affected by this virus used to send any emails, the moment the users clicks on the sent button, the legitimate email bounces back and a fresh message is displayed “Mail Transaction Failed”. So, when the user tried all over again to send the mail, at that point of time, the infection multiplied and the virus spread through the networks to other system as well. Due to such unique ways of spreading, the reach of the virus was more than all other that are talked above. This virus was stored in the address book of the users and it automatically generated emails and sent them to the list at random intervals. It is on account of such quick dissemination that it almost affected every personal and professional computer linked to the internet. The loss generated on account of this virus stood at a whopping $38 billion.


Viruses now-a-days have become part and parcel of everyday computer usage, at the same time, if one has to talk about the change that has happened ever since all of these viruses hit the global village is the development of more advanced, resilient and highly effective anti-virus program. So, if you want to keep your system safe and just going, in that case, first and foremost thing that you can go for is updating your system with the best anti-virus program acquired from prominent and authorized vendors. At the same time, you must make it a point to update your anti-virus regularly. Every day the anti-virus team comes across new viruses and they update the best protection and threat removal features in their anti-virus programs. So, if you are updating your antivirus regularly, in that case, your system is well equipped to fight with any kind of virus. At the same time, if you are concerned about identity theft happening through malware, spyware and you are also cautious with respect to cybercrime, in that case, you must keep your firewall on and employ all features mentioned on the antivirus program for improving the prospects of your computer and internet usage. Now-a-days, there are many antivirus programs that comes with scam and alerts features, so go for those antiviruses that can keep you updated regarding the newest line of viruses that have hit the world. If you are adhering to these advices that are given in this solution column, in that case, your probabilities of safety and security increases manifolds.

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My name is Anurag Sharma.
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