Recently, our team uncovered a particularly sneaky piece of malware tucked away in a place many WordPress users don’t even know exists: the mu-plugins folder. In fact, back in March, we saw a similar trend with hidden malware in this very directory, as detailed in our post Hidden Malware Strikes Again: MU-Plugins Under Attack. This current infection was designed to be quiet, persistent, and very hard to spot. ./wp-content/mu-plugins/wp-index.php For those unfamiliar, mu-plugins stands for ...
