Massive WordPress Redirect Campaign Targets Vulnerable tagDiv Themes and Ultimate Member Plugins

This August, we’ve seen a new massive wave of WordPress infections that redirect visitors to unwanted sites. When redirected, users see annoying pages with random utroro[.]com addresses and fake reCAPTCHA images. The messages and content try to convince visitors to verify and subscribe to browser notifications without disclosing the purpose of this behavior. Alternative redirect…

Unwanted Ads via Baidu Links

The malware attack that began as an installation of malicious Injectbody/Injectscr WordPress plugins back in February has evolved since then. Some of the changes were documented asUpdates at the bottom of the original blog post, however, every week we see minor modifications in the way they obfuscate the scripts or the files they inject them into.…

Obfuscation Through Legitimate Appearances

Recently, I analyzed a malware sample provided by our analyst Edward C. Woelke and noticed that it had been placed in a core WordPress folder. This seemed suspicious, since no such core WP file like it exists: ./wp-includes/init.php Deceiving Appearances I started with a standard analysis and my first thought was, this has to be…

WordPress Security – Unwanted Redirects via Infected JavaScript Files

We’ve been watching a specific WordPress infection for several months and would like to share details about it. The attacks inject malicious JavaScript code into almost every .js file it can find. Previous versions of this malware injected only jquery.js files, but now we remove this code from hundreds of infected files. Due to a…