If Google has flagged your domain as malicious, you need to cover the steps below in order to clean it:
- Find and clean the malicious content from your site.
- Log in your Google Webmaster Tools and go to the Security Issues Report section.
- After you are sure that you have removed all the malicious content from the site, click Request a Review.
Usually the Malware reviews are completed for few days. If no malicious content is found on your site during the review, Google will remove the malware flag from your domain.