Pop-Up on website requires authentification

Hello,
I have a problem with my bandpage that I can not figure out.
Everytime the site is visitid, a popup appears, demanding username and password to connect to a page called “ayobanez.de

When I open the scource code of my website, “ayobanez.de” is mentioned only in three places, within a section called “Piwik Tracking Code”. It looks like this:

[i]


<!-- Piwik -->
<script type="text/javascript">
var pkBaseURL = (("https:" == document.location.protocol) ? "https://ayobanez.de/piwik/" : "http://ayobanez.de/piwik/");
document.write(unescape("%3Cscript src='" + pkBaseURL + "piwik.js' type='text/javascript'%3E%3C/script%3E"));
</script><script type="text/javascript">
try {
var piwikTracker = Piwik.getTracker(pkBaseURL + "piwik.php", 3);
piwikTracker.trackPageView();
piwikTracker.enableLinkTracking();
} catch( err ) {}
</script><noscript><p><img src="http://ayobanez.de/piwik/piwik.php?idsite=3" style="border:0" alt="" /></p></noscript>
<!-- End Piwik Tracking Code -->

[/i]

I have never before heard of Piwik or ayobanez!!

Can you tell me how to get rid of this?
I am using Wordpress for my website, could it be some plugin that I installed unknowingly? How would I find out?

I would really appreciate any help, I am only a beginner on website/wordpress design.

In case you want to take a direct look:
www.nightliferocks.de

Thank you!

It could be a plugin, could be your site was hacked and for some reason the people who are using your domain now are tracking its useage.

If you go to ayobanez.de its a directory listing of a bunch of sites I guess were properly hosted on that domain at some time. You will also find your domain listed under the hosting directory. If you are not associated with this site and you truly did not install anything related to piwik. I would first change every password that has access to your site. Make sure they are all 25+ characters while making sure to use upper lower and special characters. I try and avoid # as some programs have issues with that in a password.

But this is all just from a few minute peak into everything and only based off the little bit that you have stated. It is fishy to me from what you have stated and I have seen, there are a bunch of sites you can get easy access to how it is right now. Check your logs very carefully

Good luck though