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TROJ_WIRELURK.A

November 07, 2014
 Analysis by: Cris Nowell Pantanilla
 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Via app stores


The Wirelurker malware was seen affecting both OS X and iOS devices.

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

This Trojan may be unknowingly downloaded by a user while visiting malicious websites. It may be downloaded from app stores/third party app stores.

  TECHNICAL DETAILS

File Size:

12489250 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

07 Nov 2014

Payload:

Connects to URLs/IPs, Steals information

Arrival Details

This Trojan may be unknowingly downloaded by a user while visiting malicious websites.

It may be downloaded from app stores/third party app stores.

Installation

This Trojan drops the following files:

  • %User Temp%\apps.ipa
  • %User Temp%\third.ipa

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

Backdoor Routine

This Trojan connects to the following URL(s) to send and receive commands from a remote malicious user:

  • http://www.{BLOCKED}baby.com

NOTES:

Once executed, it searches for the installation of iTunes. If not found, it prompts the user to install iTunes by redirecting the user to the webpage www.apple.com/cn/itunes/download.

It monitors for a device to be connected into the system. If a device is connected, it gathers the following data from the device:

  • Apple ID
  • Device Name
  • Model Number
  • Phone Number
  • Product Version
  • Serial Number

It then sends the data the following site using the following format:

http://www.{BLOCKED}baby.com/app/app.php?sn={serial}&pn={phone}&mn={model}&pv={product}&appid={id}&os=windows

  SOLUTION

Minimum Scan Engine:

9.700

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Identify and terminate files detected as TROJ_WIRELURK.A

[ Learn More ]
  1. Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
  2. If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
  3. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

Step 3

Search and delete this file

[ Learn More ]
There may be some files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
    %User Temp%\apps.ipa
    %User Temp%\third.ipa

Step 4

Scan your computer with your Trend Micro product to delete files detected as TROJ_WIRELURK.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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