Analysis by: Odessy Silva
ALIASES:

Trojan-Banker.Win32.ChePro.iuc (Kaspersky), W32/Banload.TFP!tr.dldr (Fortinet), Trojan-Downloader.Win32.Banload.rxb (v) (Sunbelt)

 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: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel: Downloaded from the Internet

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. It executes downloaded files whose malicious routines are exhibited by the affected system.

  TECHNICAL DETAILS

File Size: 201,728 bytes
File Type: Other
Memory Resident: No
Initial Samples Received Date: 10 May 2014
Payload: Displays message/message boxes, 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.

Installation

This Trojan displays the following fake error messages:


Download Routine

This Trojan accesses websites to download the following files:

  • http://{BLOCKED}.{BLOCKED}.67.171/pasta1/gbplugin.jpg
  • http://{BLOCKED}.{BLOCKED}.67.171/pasta1/D63A5E3246A.jpg
  • http://{BLOCKED}.{BLOCKED}.67.171/pasta1/E174D3044694.jpg

It saves the files it downloads using the following names:

  • %User Temp%\{hostname}{9 random characters}.cpl
  • %User Temp%\{hostname}{9 random characters}.dll
  • %User Temp%\{hostname}{9 random characters}bl.dll

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

It executes downloaded files :

  • %User Temp%\{hostname}{9 random characters}.cpl

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

whose malicious routines are exhibited by the affected system.

NOTES:

This Trojan hides the initially executed copy.

  SOLUTION

Minimum Scan Engine: 9.700
FIRST VSAPI PATTERN FILE: 10.786.01
FIRST VSAPI PATTERN DATE: 10 May 2014
VSAPI OPR PATTERN File: 10.787.00
VSAPI OPR PATTERN Date: 10 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

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%\{hostname}{random 9 characters}.cpl
  • %User Temp%\{hostname}{random 9 characters}.dll
  • %User Temp%\{hostname}{random 9 characters}bl.dll

Step 3

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