TROJ_BANLOAD.GB

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.

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}