Analysis by: Yang Yang
 PLATFORM:

Android OS

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Trojan may be downloaded from app stores/third party app stores.

  TECHNICAL DETAILS

File Size: 4,265,491 bytes
File Type: APK
Memory Resident: Yes
Initial Samples Received Date: 04 Feb 2013

Arrival Details

This Trojan may be downloaded from app stores/third party app stores.

NOTES:

Once executed, this malicious app checks the phone. If the device is rooted, it will ask for root permission.

The routines below will be triggered when the app gets root permission:

  • Delete files (even system files)
  • Change files permission
  • Copy files to system folder and disguise them as system files
  • Kill other apps
  • Create daemon services

All the command strings, file names, service names are encrypted in its code:


Figure 1. Encrypted code


Figure 2. Decrypted strings

  SOLUTION

Minimum Scan Engine: 9.300
TMMS Pattern File: 1.487
TMMS Pattern Date: 10 Jun 2013

Scan your computer with your Trend Micro product to delete files detected as ANDROIDOS_RISKAPP.A. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.


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