Don, a student, came across a gaming app in a third-party app store and Installed it. Subsequently, all the legitimate apps in his smartphone were replaced by deceptive applications that appeared legi

SMS phishing involves tricking users via text messages to reveal information or click malicious links, which is not the attack vector described here.

A SIM card attack compromises the Subscriber Identity Module, typically to intercept communications or data, which differs from the app replacement and ad injection scenario.

The Agent Smith attack specifically involves replacing legitimate applications with malicious versions that appear genuine, often injecting advertisements or facilitating other harmful activities, which precisely matches the scenario described.

Clickjacking is a technique to trick users into clicking on invisible elements, often embedded in a webpage, rather than replacing installed applications or injecting ads.