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Four different Android banking trojans were spread via the official Google Play Store between August and November 2021, resulting in more than 300,000 infections through various dropper apps that posed as seemingly harmless utility apps to take full control of the infected devices.

Designed to deliver Anatsa (aka TeaBot), Alien, ERMAC, and Hydra, cybersecurity firm ThreatFabric said the malware campaigns are not only more refined, but also engineered to have a small malicious footprint, effectively ensuring that the payloads are installed only on smartphones devices from specific regions and preventing the malware from being downloaded during the publishing process.

Once installed, these banking trojans can surreptitiously siphon user passwords and SMS-based two-factor authentication codes, keystrokes, screenshots, and even deplete users’ bank accounts without their knowledge by using a tool called Automatic Transfer System (ATSs). The apps have since been removed from the Play Store.

The list of malicious dropper apps is below –

  • Two Factor Authenticator (com.flowdivison)
  • Protection Guard (
  • QR CreatorScanner (com.ready.qrscanner.mix)
  • Master Scanner Live (com.multifuction.combine.qr)
  • QR Scanner 2021 (com.qr.code.generate)
  • QR Scanner (com.qr.barqr.scangen)
  • PDF Document Scanner – Scan to PDF (com.xaviermuches.docscannerpro2)
  • PDF Document Scanner Free (
  • CryptoTracker (
  • Gym and Fitness Trainer (com.gym.trainer.jeux)

While Google earlier this month instituted limitations to restrict the use of accessibility permissions that allow malicious apps to capture sensitive information from Android devices, operators of such apps are increasingly refining their tactics by other means even when forced to choose the more traditional way of installing apps through the app marketplace.

images from Hacker News