We are investigating reports of Magento sites being targeted by Guruincsite malware (Neutrino exploit kit). We have not identified a new attack vector at this time, but have found that nearly all impacted sites checked so far were vulnerable to a previously identified code execution issue for which we released a patch in early 2015; sites not vulnerable to that issue show other unpatched issues. The malware can also take advantage of situations where an administrative account has been compromised through weak passwords, phishing, or any other unpatched vulnerability that allows for administrative access, so it is important to check for fake user accounts and for leftover demo accounts.Magento merchants are advised to follow best practices to ensure the security of their sites as well as:

  • Check their sites for Guruincsite and other malware and security vulnerabilities that could be used in future attacks at http://magereport.com. This is a very useful Magento community project that is not affiliated with Magento.
  • Search for and remove any malicious scripts that have been injected into your pages. You can then submit an unblock request to Google using Google Webmaster. Instructions from Magereport on finding and fixing these scripts can be found here.
  • Please review all admin users in your system, including accounts with the username “admin” that could be left over from sample data installations. Remove any accounts that you are not actively using.
  • Implement all available patches ASAP to close any exploitable vulnerability. Please visit the Magento Security Center for a list of patches.

More information as available will be posted at https://magento.com/security.

“Magento Security Announcement.” Message to Magento Team. 20 Oct. 2015. E-mail.