Top 10 Most Dangerous Viruses

Top 10 Most Dangerous VirusesDangerous Viruses are created, caught and destroyed everyday as the battle between the evil programmers and the antivirus companies continue. But it is not without some damage and fight that these dangerous viruses go out. Once an affective antidote has been made for these computer pests, they are no longer a threat as the update quickly travels to the internet users around the world. A virus is actually a hidden program with only a few set of commands to execute when run and often autoruns after being copied. From there on, it is up to its actions depend on its commands like wiping out or corrupting the hard disk or pilfering secret and sensitive data from the target. What these dangerous viruses do is to try and create havoc in the systems they have entered and to try to spread themselves as fast as possible. Huge losses have been inflicted to companies around the world due to the damaged and loss of data caused by these dangerous viruses. Some of the computer viruses which can be considered in the list of top 10 most dangerous viruses of the world are listed below.




10. Melissa


A gift from David L Smith to his fellow humans who unknowingly clicked on an email sent to them from a certain “Melissa”. Once the lovely Melissa is inside, it very conveniently makes its way over to the outlook files and sends a copy of itself to all the contacts saved there. Thus starts the vicious circle which was named in the memory of a stage performer David had a strong liking for. Melissa ranks 10th in the Top 10 Most Dangerous Viruses list.




Coming from a beautiful girl, ILOVEYOU would be the most beautiful thing you would have heard (no matter how many times) in your life.  An ILOVEYOU mail to you would not be as thrilling but would want to make you open it to find who your secret admirer is. On the contrary, finding out that the ILOVEYOU virus has spread through your system and has slowed it down to a snail’s pace has quite another other affect. The ILOVEYOU was a dangerous viruses which laboriously copied itself in each and every file and folder present in the HDD and filled all of the free space! It even overwrote and corrupted any data which unfortunately came its way making it a very dangerous virus.


8. Code Red and Code Red II

Code Red and Code Red II

Not even the White House computer system could save itself from these dangerous viruses called Code Red and Code Red II. The Code Red and Code Red II use any backdoors they can find in the system and exploit these security flaws to enter and spread inside. The Code Red and Code Red II do give the user a fair chance by fearlessly announcing their presence once their work is complete! With losses caused by Code Red and Code Red II amounting around $2.5 billion, we have ranked it 8th in the list of Top 10 Most Dangerous Viruses.


7. Nimda


Nimda (or admin spelled backwards) is a unique virus and different from the other most dangerous viruses on this list. What Nimda does is to create innumerable traffic from its affected computer to any server or web hosting it can find which will result in the slowing down of the server as well as exceeded bandwidth limit. Nimda alone caused more than $620 million in damages around the world just within half an hour! What made this a dangerous virus was that it had more ways of propagation and spreading than any other in the history of computers.


6. SQL Slammer/Sapphire

SQL Slammer Sapphire

SQL Slammer/Sapphire is 6th on the list of the Top 10 most dangerous viruses till now. SQL Slammer/Sapphire practically owned the internet when it infected around 80 thousand computers which accessed the internet within a short span of ten minutes! SQL Slammer/Sapphire achieved the unthinkable by secretly breaking into the servers of the largest internet providers of the world and then going on the spread to those users who were connected to it!


5. MyDoom


MyDoom is probably the most well known computer virus in the most dangerous viruses list because it managed to affect a large part of the internet back in the yearly 2000s! Like a real viruses or parasites, MyDoom rapid copies itself in all the directories it can find on the hard drive. After that, it propagates by attaching itself to any email being sent from that computer and downloads automatically as soon as it reaches an uninfected computer!


4. Sasser


Sasser virus infinitely loops up your operating system boot up and can cause huge hardware losses if not checked within time. The Sasser virus is much easier to stop if you have the right kind of antivirus and firewall installed in your system. The Sasser is on the most dangerous viruses list only because it attacks and causes physical damage to you computer and is not as dangerous or threatening as other computer virus on the list.


3. Leap-A/Oompa-A

Leap-A Oompa-A

Leap-A/Oompa-A is placed 3rd in the most dangerous viruses list of the world and rightly so. Leap-A/Oompa-A depends on the online interaction between chat enthusiastic who love to roam through the chat rooms looking for new friends. It is often hidden in a picture file and to the target. Once there, it starts going through your contacts and sending them messages to your contacts. They will accept any file coming from your messenger without hesitation and the virus spreads! The Leap-A/Oompa-A is somewhat similar to the Klez virus and has been included in the Top 10 Most Dangerous Viruses list.


2. Storm Worm

Storm Worm

Ranking 2nd in the Top 10 Most Dangerous Viruses list only because Duqu / Flame / Stuxnet has beaten it for the top slot, Storm Worm is one of  the most hazardous and most dangerous viruses ever and is equally unsafe to the user as well as the developers. Secretly attached to an email or picture, Storm Worm spreads rapidly like a bushfire in your hard drive, wiping out every piece of information is comes across. One can only imagine the amount of loss both financial and emotional one has to go through if the Storm Worm does get through your antivirus shield.


1. Duqu / Flame / Stuxnet

Duqu Flame Stuxnet

The latest virus to hit the streets is more of a threat than all the previous viruses combined. Duqu / Flame / Stuxnet has been named as the most dangerous viruses because it secretly enters you computer and monitors each and every single thing you do and also gives access to all your file to the one who has placed it there. Duqu / Flame / Stuxnet was accidently found in computers belonging to sensitive facilities in Iran and are said to be placed there by a rival country but no solid proof has been seen so far. Duqu / Flame / Stuxnet ranks 1st in the Top 10 Most Dangerous Viruses list.



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