New first stop for hacked site recovery via Official Google Webmaster Central Blog:

How to avoid ever needing Help for hacked sites:

Just as you focus on making a site that’s good for users and search-engine friendly, keeping your site secure — for you and your visitors — is also paramount. When site owners fail to keep their site secure, hackers may exploit the vulnerability. If a hacker exploits a vulnerability, then you might need Help for hacked sites.

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So, to potentially avoid this scenario:

  • Be vigilant about keeping software updated
  • Understand the security practices of all applications, plugins, third-party software, etc., before you install them on your server. A security vulnerability in one software application can affect the safety of your entire site
  • Remove unnecessary or unused software
  • Enforce creation of strong passwords
  • Keep all devices used to log in to your servers secure updated operating system and browser
  • Make regular, automated backups of your site

via Official Google Webmaster Central Blog: New first stop for hacked site recovery.