If you suspect there's malware on your domain's website, you can use the following tools.
Google continually monitors sites across the internet for malware. You can see if they've detected any malware on your site through the Google Safe Browsing Status at https://www.google.com/transparencyreport/safebrowsing/diagnostic/.
However, this tool does not actively scan your website, nor does it help you remove malware.
ITEGY offers a product called Website Security that will scan your website for malware. Unlike Google's Safe Browsing tools, Website Security scans your website's files actively and can help you remove malware it finds.