Google announced a new outstanding feature for Google Webmaster Tools named Security Issues.
This new dashboard helps quickly know what security issues your site has, how to find the source of the issue and then how to repair your Google results after you fix the issue.
Mariya Moeva from the Google team said in a Google Webmaster Help thread explained the tool is aiming to "help webmasters whose site has been hacked pinpoint the issues and recover easily."
Here is the overview screen showing various forms of malware and hacked spam issues a site may have:
Then this screen pinpoints the issue at the source, helping you find the issue quickly on your site:
Finally, click "Request A Review" to tell Google you fixed the issue and they should put your search results back to normal.
John Mueller from Google who deals with these webmaster issues all the time said on Google+, "here's a fantastic update in Webmaster Tools to help you at least get the search-side of things back on track easier."