The SlopAds operation is a sophisticated ad fraud campaign impacting 224 Android apps, generating billions of fraudulent ad bids through hidden WebViews and steganographically concealed payloads. It cleverly evades detection by activating fraud only after app installs from ad clicks, masking its activity as organic growth. Reaching 2.3 billion daily bid requests and 38 million downloads globally, SlopAds demonstrates a significant scale of malicious monetization.