Do you get messages coming through yahoo messenger and Skype that are not coming from the other party or from the person you are conversing with? Be observant in getting weird messages that is totally out of topic when you are  chatting with friends using yahoo or Skype.  This is a new malware that comes in the form of instant messages   through yahoo or Skype. These messages include a link and when you click on it will lead you to the webpage or rapid share download. The Zip file contains the worm “W32.Skyhoo.Worm,” This worm will automatically send malicious links to your contacts in yahoo messenger or skype to spread the worms. This worm is known also to infect your MS Word and Excel file.  The worm can be spread through email when the victim will send word or excel file as attachment on email composed on Outlook.  This advance social engineering worm will only disappear if you do not have your yahoo messenger or Skype installed.