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S0406 Gustuff

Gustuff is mobile malware designed to steal users’ banking and virtual currency credentials.1

Item Value
ID S0406
Associated Names
Version 1.0
Created 03 September 2019
Last Modified 14 October 2019
Navigation Layer View In ATT&CK® Navigator

Techniques Used

Domain ID Name Use
mobile T1437 Application Layer Protocol -
mobile T1437.001 Web Protocols Gustuff communicates with the command and control server using HTTP requests.1
mobile T1533 Data from Local System Gustuff can capture files and photos from the compromised device.1
mobile T1628 Hide Artifacts -
mobile T1628.001 Suppress Application Icon Gustuff hides its icon after installation.2
mobile T1417 Input Capture -
mobile T1417.001 Keylogging Gustuff abuses accessibility features to intercept all interactions between a user and the device.1
mobile T1417.002 GUI Input Capture Gustuff uses WebView overlays to prompt the user for their device unlock code, as well as banking and cryptocurrency application credentials. Gustuff can also send push notifications pretending to be from a bank, triggering a phishing overlay.12
mobile T1516 Input Injection Gustuff injects the global action GLOBAL_ACTION_BACK to mimic pressing the back button to close the application if a call to an open antivirus application is detected.1
mobile T1406 Obfuscated Files or Information Gustuff obfuscated command information using a custom base85-based encoding.1
mobile T1406.002 Software Packing Gustuff code is both obfuscated and packed with an FTT packer.1
mobile T1644 Out of Band Data Gustuff can use SMS for command and control from a defined admin phone number.1
mobile T1636 Protected User Data -
mobile T1636.003 Contact List Gustuff can collect the contact list.1
mobile T1636.004 SMS Messages Gustuff can intercept two-factor authentication codes transmitted via SMS.1
mobile T1418 Software Discovery -
mobile T1418.001 Security Software Discovery Gustuff checks for antivirus software contained in a predefined list.1
mobile T1426 System Information Discovery Gustuff gathers information about the device, including the default SMS application, if SafetyNet is enabled, the battery level, the operating system version, and if the malware has elevated permissions.1
mobile T1422 System Network Configuration Discovery Gustuff gathers the device IMEI to send to the command and control server.1