Summary
Trojan:Android/Zsone.A sends SMS messages to premium-rate numbers related to subscription for SMS-based services.
Removal
You can set the F-Secure app to scan your device for viruses and other threats automatically. Once the app has completed its scan of the files on your device, you may assess any detected file or files and opt to remove it.
Trojan:Android/Zsone.A can be uninstalled by following the steps below:
Go to Settings
Go to Applications
Go to Manage Applications
Select the application
Press "Clear data"
Press "Uninstall"
Select "OK" when asked for confirmation and wait
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Technical Details
The detection Trojan:Android/Zsone.A identifies a number of trojanized applications that were found on the Google Android Market in May 2011.
At the time of writing, these applications were already removed from the official Android Market, but could still be found in various forums and unofficial Android application distribution sites, most commonly catering to users in mainland China.
Installation
On installation, the affected applications display the following permissions requests:
Payload
Trojan:Android/Zsone.A's malicious routine starts when the application itself is launched. On the fifth click/action performed in the app, Zsone.A's SMS-sending payload is triggered.
The trojan will silently send SMS messages to the following hard-coded premium-rate phone numbers:
- 10626213
- 10621900
- 106691819
- 1066185829
- 10665123085
The SMS messages observed so far contain the following text strings:
- aAHD
- 921X1
- 921X2
- 28AHD
- 95pAHD
- M6307AHD
These strings are used within Chinese mobile networks for subscribing to various paid SMS services. The trojan's behavior may result in registering the user's device to a service, thereby incurring unsolicited charges.
The trojan hides its SMS-sending activity from the user by aborting SMS messages received from the following numbers:
- 10086
- 10000
- 10010
- 1066133
- 10655133
- 10621900
- 10626213
- 106691819
- 1066185829
- 10665123085
- 10665123085
Zsone.A maintains a record of its SMS-sending status in an XML file in the shared preferences folder. When an SMS message is sent, the trojan saves a 'Y' ('Yes') in the XML file.
Other variant
- Trojan:Android/Zsone.C
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