You have found this post because you’re trying to find out about an attack from 7speed.info a malware site that has somehow infected your web site causing virus alert warnings from programs such as Avast. I struggled to find out information searching Google for an answer when it happened to me yesterday. I fumbled around and eventually found the way to resolve it thanks to Scott of MTMinds.
First make your site secure using new stronger passwords on your server access point and when using ftp. Change these passwords immediately. Use passwords with 8 to 12 character length that are not meaningful words just a string of letters (upper & lower), punctuation and numbers. I now use this site to generate ones automatically for me: PC Tools Secure Password Generator.
If you take all this out the problem is resolved. Back up just in case you make a mistake.
I have several sites and found the easiest way to see if my site was infected was to use the information menu on FireFox Web Developer extension. And then searched for 7speed.info. It highlighted any code on the site. I could then locate the page via ftp and delete the code.
In my experience it was Index.html and index.php pages infected on basic sites
Header.php and Footer.php on basic sites with include files.
On Drupal templates you need to go into the directory of the theme you are using and locate the page.tpl.php file
On PHP Fusion edit the subheader.php and footer.php files
On WordPress go into the theme directory and edit the header.php and footer.php files.
Hope that helps.