5 The most dangerous computer viruses

computer-viruses

Getting a computer virus went on to several users in some fashion or another. To most, it's simply a slight inconvenience, requiring cleanup and so installing that antivirus program that you’ve been assuming to install however never got around to. however, in different cases, it may be a complete disaster, with your pc turning into a really expensive brick which that no amount of antivirus will protect.

In this list, we'll highlight some of the worst and infamous computer viruses that have caused a lot of harm in reality. And since people sometimes equate general malware like worms and trojan horses as viruses, we’re together with them furthermore. This malware has caused tremendous damage, amounting to billions of dollars and disrupting critical reality infrastructure.

Here are the 5 most dangerous computer viruses.

1. ILOVEYOU

ILOVEYOU is a computer viruses that needs to be taken into account as one of the most virulent computer viruses ever made and it is not difficult to know the reason. This virus managed to destroy interference with computer systems everywhere in the world, causing total damage worth around $ 10 billion. 100% of internet-connected computers in the world are believed to have been infected. so dangerous that the government and large companies make their mail delivery system offline to prevent infection.

The virus was created by 2 Filipino programmers, Reonel Ramones, and Onel de Guzman. What it did was use social engineering to induce people to click on the attachment; during this case, a love confession. The attachment was truly a script that poses as a TXT file, because of Windows at the time activity the actual extension of the file. Once clicked, it'll send itself to everybody within the user’s mailing list and proceed to overwrite files with itself, creating the computer unbootable. the two were ne'er charged, as there have been no laws about malware. This led to the enactment of the E-Commerce Law to address the matter.

2. Code Red

Code Red 1st surfaced in 2001 and was discovered by 2 eEye Digital Security employees. it had been named Code Red because the pair were drinking Code Red Mountain condensate at the time of discovery. The worm targeted computers with Microsoft IIS web server installed, exploiting a buffer overflow problem within the system. It leaves little trace on the hard disk because it is able to run entirely on memory, with a size of 3,569 bytes. Once infected, it'll proceed to create 100 copies of itself however due to a bug within the programming, it'll duplicate even a lot of and ends up intake a lot of the resources of the system.

It will then launch a denial of service attack on several IP addresses, famous among them the web site of the White House. It conjointly allows backdoor access to the server, allowing for remote access to the machine. the foremost memorable symptom is that the message it leaves behind on affected web pages, "Hacked By Chinese!", that has become a meme itself. A patch was later discharged and it had been estimated that it caused $2 billion in lost productivity. a complete of 1-2 million servers were affected, which is wonderful when you consider there have been 6 million IIS servers at the time.

3. Melissa

Named after an exotic dancer from Florida, it had been created by David L. Smith in 1999. It started as an infected Word document that was announced up on the elevation. sex Usenet cluster, claiming to be a listing of passwords for pornographic sites. This got people curious and once it was downloaded and opened, it'd trigger the macro within and unleash its payload. These computer viruses will mail itself to the highest 50 people within the user’s email address book and this caused an increase of email traffic, disrupting the email services of governments and companies. It conjointly sometimes corrupted documents by inserting a Simpsons reference into them.
Smith was eventually caught after they traced the Word document to him. The file was uploaded using a taken AOL account and with their help, enforcement was ready to arrest him less than every week since the outbreak began. He cooperated with the FBI in capturing different virus creators, famous among them the creator of the Anna Kournikova virus. For his cooperation, he served solely 20 months and paid a fine of $5000 of his 10-year sentence. The virus reportedly caused $80 million in damages.

4. Sasser

A Windows worm first discovered in 2004, it had been created by computing student Sven Jaschan, World Health Organization also created the Netsky worm. whereas the payload itself is also seen as simply annoying (it slows down and crashes the computer while making it hard to reset while not cutting the power), the results were improbably disruptive, with millions of computers being infected, and vital, crucial infrastructure affected. The worm took advantage of a buffer overflow vulnerability in native Security Authority Subsystem Service (LSASS), that controls the protection policy of native accounts causing crashes to the computer. it'll also use the system resources to propagate itself to different machines through the internet and infect others automatically.

The effects of the virus were widespread as whereas the exploit was already patched, several computers haven’t updated. This led to quite 1,000,000 infections, eliminating critical infrastructures, like airlines, news agencies, public transportation, hospitals, public transport, etc. Overall, the harm was estimated to possess cost $18 billion. Jaschen was tried as a minor and received a twenty-one month suspended sentence.

5. Zeus

Zeus may be a trojan horse created to infect Windows computers so it'll perform various criminal tasks. the foremost common of those tasks are sometimes man-in-the-browser keylogging and form grabbing. the bulk of computers were infected either through drive-by downloads or phishing scams. first identified in 2009, it managed to compromise thousands of FTP accounts and computers from large international companies and banks such as Amazon, Oracle, Bank of America, Cisco, etc. Controllers of the Zeus botnet used it to steal the login credentials of social network, email and banking accounts.


In the US alone, it had been estimated that over 1 million computers were infected, with 25th within the US. the complete operation was refined, involving people from around the world to act as cash mules to smuggle and transfer money to the ringleaders in eastern Europe. regarding $70 million were stolen and in possession of the ring. 100 people were inactive in the affiliation of the operation. In late 2010, the creator of Zeus announced his retirement however several experts believe this to be false.

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