Analysis by: Christopher Daniel So
ALIASES:

TrojanDownloader:Win32/Banload.IB (Microsoft), PWS-Banker.de (McAfee), Trojan-Downloader.Win32.Agent.cglc (Kaspersky)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • 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.

As of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size: 71,680 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 12 Jan 2012

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 creates the following folders:

  • %System Root%\drivers

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

Download Routine

This Trojan accesses the following websites to download files:

  • http://{BLOCKED}2.hpg.ig.com.br/ree1.html
  • http://{BLOCKED}3.hpg.ig.com.br/ree2.html
  • http://{BLOCKED}4.hpg.ig.com.br/nl2.html
  • http://{BLOCKED}5.hpg.ig.com.br/nl3.html
  • http://{BLOCKED}5.hpg.ig.com.br/nl4.html
  • http://{BLOCKED}5.hpg.ig.com.br/nl5.html
  • http://{BLOCKED}5.hpg.ig.com.br/nl6.html
  • http://{BLOCKED}5.hpg.ig.com.br/nl7.html

It saves the files it downloads using the following names:

  • %System Root%\drivers\ree1.txt
  • %System Root%\drivers\ree2.txt
  • %System Root%\drivers\nl2.txt
  • %System Root%\drivers\nl3.txt
  • %System Root%\drivers\nl4.txt
  • %System Root%\drivers\nl5.txt
  • %System Root%\drivers\nl6.txt
  • %System Root%\drivers\nl7.txt

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

As of this writing, the said sites are inaccessible.

  SOLUTION

Minimum Scan Engine: 9.200
FIRST VSAPI PATTERN FILE: 8.712.05
FIRST VSAPI PATTERN DATE: 16 Jan 2012
VSAPI OPR PATTERN File: 8.713.00
VSAPI OPR PATTERN Date: 17 Jan 2012

Step 1

For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

Step 2

Search and delete this folder

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %System Root%\drivers

Step 3

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