A malicious Android app campaign called “Vapor” has been discovered, designed to trick users into revealing sensitive information through misleading ads. This campaign includes various apps posing as utilities, such as QR code scanners and health trackers, with over 60 million downloads collectively. It primarily targets users in Brazil, the United States, and Mexico. Some apps have evaded detection by not showing harmful behavior immediately after installation and by disguising themselves. They use tactics like inundating users with full-screen ads and employing scare tactics to prompt downloads of additional harmful apps. The campaign may be run by a single cybercriminal group or a coalition, utilizing shared malware development tools. Despite Google removing many harmful apps, new variants continue to emerge, highlighting the evolving nature of mobile malware.