Here is the list of most dangerous computer viruses which may prove horrible for your PC. These viruses were most active in the year 2012. These viruses are Sirefef, Reveton, Dorkbot, DNSChanger and W32/iFrame are guilty at the moment. These viruses steal, extort, cheat and destroy. Sometimes they go to attack your most sensitive data. An unprotected PC is oh so easy to attack by these little creatures.

The elite of malicious software (also called malware) exploit vulnerabilities in popular applications to propagate and carry out harmful actions over several months or years.

Suggested Reading : Top 10 Computer Viruses of all time

For each of these viruses, we recommend vaccines and preventive actions. And if you see one on your PC, arm yourself with an urgent anti-virus!

Deadliest Computer Viruses of 2012 are :

Sirefef, the rootkit that turns your PC into a zombie (Botnet)

zeroaccess_chart

But what is a rootkit? Its other name is more explicit but less reassuring rootkit activity …Elusive and complex Sirefef, also known as the ZeroAccess or  Max + +, is a virus whose main purpose is to transform a PC into a zombie infected PC by connecting it to a node in a vast network of computers (botnets).

Through the infected network, the goal is to earn money by clicking ads or install fake antivirus a fee for cleaning immediate and supposedly miraculous.

The user does not notice, but the use of the connection is constant and can reach more than 32 GB per month (equivalent to 45 films). And in the worst case, the zombie PC can participate in activities of cyber war.

The best remedy against Sirefef is a preventive vaccine with one of these two options:

In most cases, the infection occurred during the execution of suspicious files, most of which were presented as famous codec packs (K-Lite or DivX). So always check the authenticity of files or executables in a Sandbox .

Reveton virus, the police (Ransomware)

The vulnerability of Java has since the beginning of 2012, millions of computers to be “kidnapped” by a virus masquerading as police, nothing less … Under various pretexts (downloading illegal files, for example) virus asked to pay a sum of money via payment systems Ukash or other payment systems.

The virus in question is known by different names: Reveto-n, FBI Moneypak Troj / Ransom, Rannoh.

virus

 

If you are taken “hostage” by the virus, here are three ways to get rid of your kidnappers:

As a preventive measure, update Java tools regularly that prevent applications at first sight.

W32/iFrame the thief passwords (phishing)

The large family of viruses’ iFrame is proof that even a website can be W32 iframe virusdangerous. These viruses take advantage of the HTML tag <iframe> used to insert pages or other multimedia elements in other pages, to inject malicious code on seemingly innocuous sites.

Among the observed damage due to iFrame virus type, we can enumerate the theft of personal information (phishing), fraudulent purchases or unsolicited or attack to other sites via techniques of denial of service (Denying Access).

The elimination of this type of malware is the responsibility of the owners of infected websites. If they do not clean their codes at sites and do not update the server software, the infection will still remain there. It is also important to set passwords if you use a content management system like WordPress or Drupal.

For the user, the best defense is to use reputation as auditors Wot and secure browser like Chrome, or also open each page via an isolated environment such as in a virtual machine.

Dorkbot virus, Skype (Chat)

Dorkbot virus

The Trojan Dorkbot is a perfect example of “social” virus Dorkbot. This malware is a variant of the worm Dorkbot, a ransomware that passes through backdoor seeps on your PC and blocks all access to your personal data. Everything will be in order if you pay the $ 200 within the next 48 hours…

The mode of transmission is still the same. One of your contacts calls you on Skype to laugh at your new profile picture. The original message is like this:

lol is this your new profile pic?

http://goo.gl/ [encrypted message]? img = [username]”

By clicking the user downloads a zipped file named Skype_datedujour_image.zip containing the virus in an executable file. This exe file copy itself into the user data as the Jqfsfb.exe, ready to be launched at Windows startup.

Disinfection can be performed with the LiveCD antivirus (virus prevented from reaching the desktop).

In case of infection, it is recommended to use an anti-virus CD to perform a thorough disinfection and the virus does not have the time to protect himself or steal private data. Among this category of software include for example:

DNSChanger, the saboteur connections (Hijacker)

This is probably the virus that has received the most media coverage!changer-virus

Trojan type, DNSChanger is designed to change the DNS settings of your computer without your knowledge.

The infection can be stopped by using simple anti-virus software. DNS is used by computers around the world connected to the Internet to transform the IP addresses (like 48.57.66.25) in web addresses (like http://ftechblog.com).

The DNS Changer Malware maliciously change the DNS settings of your computer to return all your web traffic on own servers creators of this virus. This is dangerous because the criminals behind DNS Changer would be able to divert your research and direct you to malicious sites.

If your PC is one of the unfortunately infected PCs, you can still take action. The anti-virus will most known case:

And this Kaspersky tool is specifically designed to thwart this type of malware: Kaspersky TDSSKiller

Conclusion

The safest way to protect yourself from these nasty critters is to use an anti-virus program and clean your computer regularly with solutions such as CCleaner. But the best protection is to keep a modicum of common sense when your computer asks you to do something unusual)

Have you suffered a virus attack? Tell us about your experience in the comments!”

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Last Updated on April 17, 2014

Comments:
  1. Rajkumar Jonnala

    Dorkbot virus, Skype can cause the worst effect globally. As people around the world are making most business conversations in Skype.

    • yogesh

      You are right Rajkumar and everyone should have one live cd with him so that it can be healed also.

  2. Ravi D’souza

    Yes Skype virus is the deadliest I am still waiting to see if someone can infect google chat as well, there have been many, viruses infecting yahoo chat in the past.

  3. Custom Essays

    Amazing and interesting articles this very harmful thanks to share this post.

  4. Swayam

    Valuable information. Thanks for sharing.

  5. Anshul

    Really dangerous viruses for the computer.useful information thanks for sharing..

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