BeatBanker Android Malware Uses Fake Starlink App to Deliver BTMOB RAT

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Summary

Kaspersky reports BeatBanker campaigns targeting users in Brazil with a fake Starlink app. The malware uses stealth and persistence techniques, mines Monero, and its latest version deploys BTMOB RAT for remote device access.

Key points

  • Kaspersky found BeatBanker campaigns targeting users in Brazil; fake Google Play Store sites use a Starlink-themed app to lure users into sideloading an APK.
  • The APK decrypts and loads hidden DEX code in memory, checks for analysis environments, and delays malicious activity.
  • The latest version deploys BTMOB RAT instead of the banking module, enabling capabilities including keylogging, screen and camera access, GPS tracking, and credential capture.
  • BeatBanker uses a modified ARM build of XMRig to mine Monero and can start or stop mining based on device conditions.
  • Firebase Cloud Messaging telemetry reports device battery, temperature, charging, and usage status to help adjust mining activity.
  • A nearly inaudible five-second MP3 loop keeps a foreground service active to help prevent the malware from being suspended.

Article Details

Attack Vectors
  • BeatBanker is distributed as an APK on websites impersonating the Google Play Store and posing as a Starlink app, prompting users to sideload it.
  • A fake Play Store update screen tricks victims into granting permissions to install additional payloads.
  • The latest reported version deploys BTMOB RAT, which enables remote device control, keylogging, screen recording, camera access, GPS tracking, and credential capture.
  • BeatBanker mines Monero using a modified XMRig miner and adjusts mining activity according to device conditions.
  • The malware uses Firebase Cloud Messaging to send device status information to its command-and-control server.
Defensive Notes
  • Avoid sideloading APKs from outside the official Google Play Store unless the publisher or distributor is trusted.
  • Review granted permissions and be cautious of risky permissions unrelated to an app’s functionality.
  • Perform regular Play Protect scans.

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