Over 6,000 WordPress Hacked To Install Plugins Pushing Infostealers

WordPress sites are being compromised through malicious plugins that display fake software updates and error messages, leading to the installation of information-stealing malware. BleepingComputer reports: Since 2023, a malicious campaign called ClearFake has been used to display fake web browser update banners on compromised websites that distribute information-stealing malware. In 2024, a new campaign called ClickFix was introduced that shares many similarities with ClearFake but instead pretends to be software error messages with included fixes. However, these "fixes" are PowerShell scripts that, when executed, will download and install information-stealing malware.

Last week, GoDaddy reported that the ClearFake/ClickFix threat actors have breached over 6,000 WordPress sites to install malicious plugins that display the fake alerts associated with these campaigns. "The GoDaddy Security team is tracking a new variant of ClickFix (also known as ClearFake) fake browser update malware that is distributed via bogus WordPress plugins," explains GoDaddy security researcher Denis Sinegubko. "These seemingly legitimate plugins are designed to appear harmless to website administrators but contain embedded malicious scripts that deliver fake browser update prompts to end-users."

The malicious plugins utilize names similar to legitimate plugins, such as Wordfense Security and LiteSpeed Cache, while others use generic, made-up names. Website security firm Sucuri also noted that a fake plugin named "Universal Popup Plugin" is also part of this campaign. When installed, the malicious plugin will hook various WordPress actions depending on the variant to inject a malicious JavaScript script into the HTML of the site. When loaded, this script will attempt to load a further malicious JavaScript file stored in a Binance Smart Chain (BSC) smart contract, which then loads the ClearFake or ClickFix script to display the fake banners. From web server access logs analyzed by Sinegubko, the threat actors appear to be utilizing stolen admin credentials to log into the WordPress site and install the plugin in an automated manner.