Threat Descriptions

Trojan:Android/SMStado

Classification

Category :

Malware

Type :

Trojan

Platform :

Android

Aliases :

Trojan:Android/SMStado, Trojan:Android/SMStado.A

Summary

Trojan:Android/SMStado sends SMS messages to Russian-specific premium-rate numbers.

Removal

Once the scan is complete, the F-Secure security product will ask if you want to uninstall the file, move it to the quarantine or keep it installed on your device.

A False Positive is when a file is incorrectly detected as harmful, usually because its code or behavior resembles known harmful programs. A False Positive will usually be fixed in a subsequent database update without any action needed on your part. If you wish, you may also:

  • Check for the latest database updates

    First check if your F-Secure security program is using the latest updates, then try scanning the file again.

  • Submit a sample

    After checking, if you still believe the file is incorrectly detected, you can submit a sample of it for re-analysis.

    Note: If the file was moved to quarantine, you need to collect the file from quarantine before you can submit it.

  • Exclude a file from further scanning

    If you are certain that the file is safe and want to continue using it, you can exclude it from further scanning by the F-Secure security product.

    Note: You need administrative rights to change the settings.

Technical Details

SMStado.A is a premium-rate SMS-sending trojan that targets Russian users. Upon execution, it connects to a remote location and forwards the following information:

  • International Mobile Equipment Identity (IMEI) number
  • Package name
  • Phone number
  • Phone model

When the app is running, it sends out SMS messages containing a hard-coded text string to specified premium-rate numbers that use the Russian country code. Additionally, the malware downloads an additional package from a remote site.

More

This malware is discussed in further detail in: Q4 2011 Mobile Threat Report (PDF).