Malicious actors have been surreptitiously adding a growing number of banking trojans to Google Play Store via malicious droppers this year, proving that such a technique is effective in evading detection. Additionally, because there is a high demand for novel ways to distribute mobile malware, several malicious actors claim that their droppers could help other cybercriminals disseminate their malware on Google Play Store, resulting in a dropper-as-a-service (DaaS) model.
In the latter part of 2021, we found a malicious campaign that uses a new dropper variant that we have dubbed as DawDropper. Under the guise of several Android apps such as Just In: Video Motion, Document Scanner Pro, Conquer Darkness, simpli Cleaner, and Unicc QR Scanner, DawDropper uses Firebase Realtime Database, a third-party cloud service, to evade detection and dynamically obtain a payload download address. It also hosts malicious payloads on GitHub. As of reporting, these malicious apps are no longer available on Google Play Store.
Source: Trend Micro