TROJ_BANLOAD.ZAA

August 18, 2014
 Analysis by: Christopher Daniel So
 Modified by: Vincent Martin Hermosura
 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:

  • 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:

207,872 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

11 Apr 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 files:

  • WindowsMediaPlayer.dll detected as TROJ_INJECT.ZCC
  • wlanagent.cpl detected as TROJ_BANLOAD.ZCC
  • wlanguard.cpl detected as TROJ_BANLOAD.ZCC
  • wlanuac.cpl detected as TROJ_BANLOAD.ZCC

It 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

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.ZAA. (Note: Please skip this step if the threat(s) listed below have already been removed.)

    • TROJ_INJECT.ZCC
    • TROJ_BANLOAD.ZCC

Step 3

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