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Danger level 7
Type: Worms
Common infection symptoms:
  • Connects to the internet without permission
  • Installs itself without permissions
  • Slow Computer
  • Slow internet connection


KELIHOS Worm is obviously related to Backdoor:Win32/Kelihos. According to computer security specialists the latter program is a malicious program that is responsible distributing spam email messages. These messages come with links to installers of the same computer malware and obviously – KELIHOS Worm. In case you get infected with these related pieces of malware, you need to remove KELIHOS Worm and all the other infections, because they can connect to remote servers, receive configuration data, and even download and execute other dangerous files.

The topics of the spam email that KELIHOS Worm arrives with can vary, but lately they have been related to the April 2013 Boston Marathon events. Cyber crooks are making use of the latest news events in order to make people curious and click their links, by employing such topics as “Runner captures Marathon Explosion” or “Explosions at Boston Marathon”. The moment a user clicks the infected link he is redirected to a website that loads Java applet, and at the same time a video file is downloaded at opened on your screen.

It is obvious that, that the cyber criminals who distribute KELIHOS Worm are exploiting Java applet security loops in order to infect as many users with the worm as possible. What is more, spam email is not the only mean of KELIHOS Worm distribution. You could also be spammed with automated messages on Twitter, containing links to malicious websites.

Therefore, you should refrain from clicking on any link that is embedded in a message, especially if they are sent by random people. If you receive a mention on Twitter form an unfamiliar person with a link in it, it would be a good idea to visit that person’s profile and check his/her tweets. If you can see that there is nothing in common between you and that person, and if his/her tweets are absolutely random, or just plain gibberish, block the person at once!

KELIHOS Worm is a dangerous infection, because it can steal your sensitive information, eventually even causing you financial damage. Consequently, in order to prevent such consequences you need to invest in a powerful computer security tool and remove KELIHOS Worm automatically. At the same time you will be able to take care of the remaining infections, and you system will be protected from harm.

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