Security firm Sucuri reports that Google has blacklisted over 11,000 malware-infected WordPress domains, and over 100,000 sites in total have been affected by a new malware campaign from SoakSoak.ru.
By using a vulnerability found in the WordPress plugin RevSlider, SoakSoak modifies a file in a site’s WordPress installation and loads Javascript malware.
RevSlider is often used in WordPress themes, so many site owners may not even know they’re using the plugin, let alone that they need to update it to prevent a malware attack. Moreover, it’s not a plugin that’s easily updated, as Sucuri’s Daniel Cid points out:
“The biggest issue is that the RevSlider plugin is a premium plugin, it’s not something everyone can easily upgrade and that in itself becomes a disaster for website owner. Some website owners don’t even know they have it as it’s been packaged and bundled into their themes”
Visitors of infected sites may be redirected to a webpage that will attempt to download malware onto their computers. Google’s decision to block infected sites shortly after the vulnerability became known will hopefully prevent the malware from spreading any further.
If you believe your WordPress site has been infected by the SoakSoak malware, there is a list of resources in this WordPress Support thread that can help you correct the problem.
If you’re in the clear, then let this be a reminder that it’s incredibly important to keep your WordPress plugins updated in order to be fully protected against security vulnerabilities. Updating your plugins is just as important as keeping your WordPress installation updated to the most current version.
