I don’t think you have an ‘active’ infection, seems to be something more passive.

I think it’s more likely that the malware tried to do one of the following: Changed browser startup page, Install browser extensions, change DNS and or Proxy settings, tampered with the HOSTS file.

  1. Check browser’s startup page.

  2. It may be a spyware extension in your browser(s), try to disable all of them or start the browser in safe mode. If the problem goes away enable one by one to find the offending extension.

  3. Some program might have changed your DNS or Proxy settings for your network connections, reset them, or try to use OpenDNS or Google DNS.

  4. Your HOSTS file might have been tampered with ( http://www.tekrevue.com/tip/edit-hosts-file-mac-os-x/ ).

If you need further assistance please reply.