Analysis by: Anthony Joe Melgarejo
ALIASES:

RDN/PWS-Banker!bv (McAfee), W32/Banload.RXB!tr.dldr (Fortinet), a variant of Win32/TrojanDownloader.Banload.SAH 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:

  • 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.

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

  TECHNICAL DETAILS

File Size: 868,864 bytes
File Type: DLL, Other
Initial Samples Received Date: 30 Apr 2013

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.

Download Routine

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

  • http://{BLOCKED}costa009.com/winmicro.gif

It saves the files it downloads using the following names:

  • %AppDataLocal%\winmicro.zip

(Note: %AppDataLocal% is the Local Application Data folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local 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.

NOTES:

In the same directory (%AppDataLocal%), it extracts the following contents of the .ZIP file:

  • libmysql.dll
  • winmicrosoft.exe