Analysis by: Rika Joi Gregorio
ALIASES:

VBS/Dridex.A(FProt)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel: Downloaded from the Internet, Dropped by other malware

This Trojan may be downloaded by other malware/grayware from remote sites. It may be dropped by other malware.

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

  TECHNICAL DETAILS

File Size: 4,127 bytes
File Type: VBS
Memory Resident: No
Initial Samples Received Date: 27 May 2015
Payload: Connects to URLs/IPs, Downloads files

Arrival Details

This Trojan may be downloaded by the following malware/grayware from remote sites:

  • http://pastebin.com/download.php?i=x0XTHK8D

It may be dropped by the following malware:

  • W2KM_BARTALEX.FR

Download Routine

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

  • {BLOCKED}.{BLOCKED}.46.99/bt/bt/get.php - detected as TSPY_DRIDEX.UL
  • {BLOCKED}c.ru/7051856.png - detected as TSPY_DRIDEX.UK

It saves the files it downloads using the following names:

  • %User Temp%\99948845.exe

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

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

  SOLUTION

Minimum Scan Engine: 9.750
FIRST VSAPI PATTERN FILE: 11.694.09
FIRST VSAPI PATTERN DATE: 27 May 2015
VSAPI OPR PATTERN File: 11.695.00
VSAPI OPR PATTERN Date: 28 May 2015

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

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

Remove the malware/grayware file dropped/downloaded by VBS_BARTALEX.UK. (Note: Please skip this step if the threat(s) listed below have already been removed.)

    • TSPY_DRIDEX.UK
    • TSPY_DRIDEX.UL

Step 4

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.  
  • %User Temp%\99948845.exe

Step 5

Scan your computer with your Trend Micro product to delete files detected as VBS_BARTALEX.UK. 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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