The CamScanner app for Android was discovered to contain malicious code that could show intrusive ads and sign users up for paid subscriptions without consent. It contained a Trojan Dropper module that injects malware by appearing as legitimate software. Trojan droppers avoid detection by including benign data. Users are often infected by clicking links or downloading unknown programs from untrusted sources. Malwarebytes uses real-time protection and can detect and remove Trojan droppers without user interaction.