Analysis by: Al Victor de Leon
ALIASES:

W32/BanLoad.AB (Fortinet), Mal/Banload-AB (Sophos)

 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

 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, Dropped by other malware

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It accesses websites to download files. This action allows this malware to possibly add other malware on the affected computer.

  TECHNICAL DETAILS

File Size: 1,595,904 bytes
File Type: DLL
Memory Resident: Yes
Initial Samples Received Date: 22 May 2014
Payload: Connects to URLs/IPs, Downloads files

Arrival Details

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Download Routine

This Trojan accesses websites to download the following files:

  • http://{BLOCKED}evenda.com/param/primo/modr.zip

It saves the files it downloads using the following names:

  • %System Root%\ProgramData\modr.zip

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

NOTES:

The downloaded file %System Root%\ProgramData\modr.zip contains the following:

  • WindowsMediaPlayer.dll - detected as TSPY_BANKER.TOH
  • wlanagent.cpl - detected as TROJ_BANLOAD.ZCC
  • wlanguard.cpl - detected as TROJ_BANLOAD.ZCC
  • wlanuac.cpl - detected as TROJ_BANLOAD.ZCC

This Trojan then extracts the said files as the following:

  • %System Root%\ProgramData\WindowsMediaPlayer.dll
  • %System Root%\ProgramData\wlanagent.cpl
  • %System Root%\ProgramData\wlanguard.cpl
  • %System Root%\ProgramData\wlanuac.cpl

It then executes the said files. As a result, malicious routines of these files are exhibited on the affected system.

  SOLUTION

Minimum Scan Engine: 9.700
FIRST VSAPI PATTERN FILE: 10.826.02
FIRST VSAPI PATTERN DATE: 29 May 2014
VSAPI OPR PATTERN File: 10.827.00
VSAPI OPR PATTERN Date: 29 May 2014

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

Remove the malware/grayware file dropped/downloaded by TROJ_BANLOAD.SM5. (Note: Please skip this step if the threat(s) listed below have already been removed.)

    • TSPY_BANKER.TOH
    • TROJ_BANLOAD.ZCC

Step 3

Scan your computer with your Trend Micro product to delete files detected as TROJ_BANLOAD.SM5. 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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