TROJ_BANLOAD.GB

January 16, 2014
 Analysis by: Mark Joseph Manahan
 ALIASES:

Trojan horse Delf.ANOM (AVG) ,Trojan-Dropper.Delf (Ikarus) ,Win32/Spy.Banker.AALD trojan (Eset)

 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 BANLOAD variant checks for the presence of G-buster Plugin, a plugin that prevents malicious code from running during a banking session, on the system. It does this to indicate if the system is being used for online banking. However, this malware is able to execute its payload despite the presence of the said plugin.

To get a one-glance comprehensive view of the behavior of this Trojan, refer to the Threat Diagram shown below.

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 may be downloaded by other malware/grayware/spyware from remote sites.

  TECHNICAL DETAILS

File Size:

1,005,056 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

23 Jan 2014

Payload:

Downloads files, Connects to URLs/IPs

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.

It may be downloaded by other malware/grayware/spyware from remote sites.

Installation

This Trojan drops the following non-malicious file:

  • %Application Data%\tcefni.dat

(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.)

Download Routine

This Trojan connects to the following website(s) to download and execute a malicious file:

  • http://{BLOCKED}venturoso.com.br/modulo.txt

It connects to the following URL(s) to download its configuration file:

  • http://{BLOCKED}venturoso.com.br/htp.txt

It saves the files it downloads using the following names:

  • %Application Data%\tpp.dat - config
  • %Application Data%\{random}.txt - detected as TSPY_BANKER.GB

(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.)

NOTES:

It connects to the following URL to log infection to malware server:

  • http://{BLOCKED}venturoso.com.br/log.php?tipo={type of log}&name={filename of downloaded}&dados={data collected}

  SOLUTION

Minimum Scan Engine:

9.700

FIRST VSAPI PATTERN FILE:

10.528.02

FIRST VSAPI PATTERN DATE:

08 Jan 2014

VSAPI OPR PATTERN File:

10.529.00

VSAPI OPR PATTERN Date:

08 Jan 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 malware/grayware files dropped/downloaded by TROJ_BANLOAD.GB

Step 3

Search and delete these files

[ 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.
  • %Application Data%\tcefni.dat
  • %Application Data%\tpp.dat

Step 4

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