Android users beware — this huge fraud scam campaign hit millions of victims around the world, make sure you're not next

Man looking at smartphone.

• Trapdoor is an ad fraud campaign using 455 Android apps and 183 C2 domains
• The apps tricked users into fake updates, then secretly launched invisible WebViews to generate 659 million fraudulent ad bid requests daily
• Google removed the 24M+ downloaded apps after disclosure, with researchers warning of malvertising pipelines built from everyday installs

Security researchers have discovered and dismantled a major ad fraud and advertising operation that comprised hundreds of Android apps, and probably generated millions of dollars in profits.