Analysis by: Vincent Martin Hermosura
ALIASES:

TrojanDownloader:Win32/Banload.gen!W (Microsoft), Trojan.Win32.Generic!BT (Sunbelt), TR/Dldr.Delphi.Gen (Antivir), W32/A-1bf7cea9!Eldorado (Authentium), Gen:Variant.Symmi.2669 (Bitdefender), W32/Banload.UDE!tr.dldr (Fortinet), Trojan-Downloader.Win32.Banload (Ikarus), a variant of Win32/TrojanDownloader.Banload.UDE trojan (Esset), is suspected of Trojan.Downloader.gen (Vba32)

 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

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 executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

  TECHNICAL DETAILS

File Size: 203264 bytes
File Type: DLL
Memory Resident: No
Initial Samples Received Date: 26 Aug 2014

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.

Other System Modifications

This Trojan adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Jet\4.0\Engines
SandBoxMode = "dword:00000002"

Download Routine

This Trojan saves the files it downloads using the following names:

  • %Application Data%\{random alphanumeric characters 1}\{random alphanumeric characters 1}.exe - detected as TROJ_QULKONWI.K
  • %Application Data%\{random alphanumeric characters 2}\{random alphanumeric characters 2}.exe - detected as TROJ_QULKONWI.K

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.)

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

Mobile Malware Routine

This Trojan accesses the following website(s) to send and receive information:

  • http://{BLOCKED}.{BLOCKED}.61.17/portal1/insert/index.php

NOTES:
This Trojan uses Dropbox to download files stated above.

  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

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

 
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Jet\4.0\Engines
    • SandBoxMode = "dword:00000002"

Step 4

Remove malware/grayware files that dropped/downloaded TROJ_BANLOAD.VMNH. (Note: Please skip this step if the threats listed below have already been removed.)

    • %Application Data%\{random alphanumeric characters 1}\{random alphanumeric characters 1}.exe - detected as TROJ_QULKONWI.K
    • %Application Data%\{random alphanumeric characters 2}\{random alphanumeric characters 2}.exe - detected as TROJ_QULKONWI.K

Step 5

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

Step 6

The following created files/folders/registry keys/registry entries cannot be identified by the user since there are no reference values in the created key. The only way it can be identified is by comparing the present system information with a backup. Note that the said components do not have to be deleted since it won't be harmful to the system.

  • %Application Data%\{random alphanumeric characters 1}\{random alphanumeric characters 1}.exe
  • %Application Data%\{random alphanumeric characters 2}\{random alphanumeric characters 2}.exe


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