qgroessl, please read the thread before you post........
There are extremely detailed posts (which would have answered your questions) and removal instructions (which you also asks for) already posted some time ago.
Yes, the program sends messages to your contacts, again as explained in posts in this thread. You didn't had to give an example; Everything about that is already said before in much detail (look at Segosa's post).
Tip: and unless you have set the security in your browser in a bad way, nothing will ever be executed on its own when you click a link.
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