Discovered by security company Fox-IT, this backdoor is primarily used for blackhat SEO – injecting hidden spam content into the website for search engines to read – but could also be used to take full control of the site or spam/attack others.
If you have a website, make sure you never install themes and plugins from untrustworthy sources – especially pirated ones – because they can contain a backdoor or virus. It is much safer to install from the official repositories – e.g. WordPress.org – or buy premium plugins direct from the author.
If you are worried that you may already be affected, Fox-IT have released two scripts that can be used to scan your site, and instructions for removing it. Note that simply removing the affected themes/plugins is not enough, as the script may have created additional administrator accounts which must be deleted. You should also reset all user passwords.
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