One way to check if a website is hosting malware is to use the Google Safe Browsing diagnostic page. You'll need to replace "mysite.com" with the url you want to check. Google will then provide a malware status report for that website. If you're checking your own site and learn that it has been injected with malware (unfortunately, it does happen ), then once you've removed the malware you should request a review of your site via Google Webmasters Tools. Can anyone recommend similar tools that check for malware?