After fully cleaning up your site infection, you must inform Google to remove the blacklist warning. To do this, you must have a Google Search Console account (formerly Webmaster Tools). This way, the malware warning can quickly be removed.

To verify ownership of your website in Google Search Console:

1. Open Google Webmaster Central.
2. Click Search Console and sign in with your Google account.
3. Click Add a site.
4. Type in your site’s URL and click Continue.
5. Verify your site using the Recommended method or Alternate methods options.
6. Click Add a site.
7. Click Verify.
8. Check the Messages section to review any warnings.