ShadowCaptcha Targets WordPress Sites to Distribute Ransomware, Info Stealers, and Crypto Miners
August 26, 2025
Ransomware / Cryptojacking
A significant new campaign has been uncovered, impacting over 100 compromised WordPress sites. This initiative redirects visitors to fake CAPTCHA verification pages employing the ClickFix social engineering technique to disseminate information stealers, ransomware, and cryptocurrency miners. Dubbed ShadowCaptcha by the Israel National Digital Agency, this widespread cybercrime operation, first detected in August 2025, utilizes a combination of social engineering, living-off-the-land binaries (LOLBins), and multi-stage payload delivery to establish and sustain access to targeted systems. Researchers Shimi Cohen, Adi Pick, Idan Beit Yosef, Hila David, and Yaniv Goldman explain, “The ultimate aims of ShadowCaptcha include harvesting sensitive information through credential theft and browser data exfiltration, deploying cryptocurrency miners for illicit gains, and even initiating ransomware outbreaks.” The attacks commence when unsuspecting users visit a compromised site…