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ANDROIDOS_RUSMS.A
Malware type: Trojan
Threat sub-type: Premium Service Abuser
Destructive: No
Platform: Android OS
In the wild: Yes

Overview


This malware is related to the SMS spam attack that affected users in Taiwan. Once installed, the malicious app may send SMS, as well as intercept incoming ones. As such, this may incur charges without the user's knowledge.

To get a one-glance comprehensive view of the behavior of this Trojan, refer to the Threat Diagram shown below.

Technical Details


File size: 253833 bytes
File type: APK
Memory resident: Yes
Initial samples received date: 04 Jun 2014
Payload: Intercepts SMS

Arrival Details

This Trojan arrives via SMS messages that contain the following details:

  • http://goo.gl/W{BLOCKED}TBf

NOTES:
Once installed, it may send text messages without the user's knowledge and/or authorization. It uses an electronic payment method named Micropayment to charge the user of the affected device.

Since this malware intercepts certain incoming text messages, the user is left unaware of the charges incurred.

The malware blocks text messages from certain SMS addresses that contain the specific characters below. An SMS address is the originating address, or email address if the message came from an email gateway.

  • 6279
  • 1232111
  • mopay
  • boku
  • 66245
  • bezahlcode
  • holyo
  • 55498
  • 55496
  • 33235
  • 46645

The blocked SMS is forwarded to http://{BLOCKED}.{BLOCKED}.13.43/sms/SMSHandler1.ashx.

It also sends contacts and phone numbers to a remote server.

Solution


Minimum scan engine: 9.700

Step 1

Remove unwanted apps on your Android mobile device

[ Learn more ]

Step 2

Trend Micro Mobile Security Solution

Trend Micro Mobile Security Personal Edition protects Android smartphones and tablets from malicious and Trojanized applications. The App Scanner is free and detects malicious and Trojanized apps as they are downloaded, while SmartSurfing blocks malicious websites using your device's Android browser.

Download and install the Trend Micro Mobile Security App via Google Play.


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Analysis By: Yang Yang

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