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W2KM_DRIDEX.BYY

February 13, 2016
 Analysis by: Rhena Inocencio
 ALIASES:

TrojanDownloader:O97M/Adnel (Microsoft), Trojan-Downloader.VBS.Agent.bev (Kaspersky), VBA/TrojanDownloader.Agent.ASC (ESET)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 REPORTED INFECTION:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

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

  TECHNICAL DETAILS

File Size:

69,664 bytes

File Type:

DOC

Initial Samples Received Date:

19 Jan 2016

Arrival Details

This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

Download Routine

This Trojan accesses the following websites to download files:

  • http://www.{BLOCKED}ectronics.{BLOCKED}o.jp/09u8h76f/65fg67n

It saves the files it downloads using the following names:

  • %User Temp%\eruseedb.exe - detected as TSPY_DRIDEX.YYSRC

(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:

9.800

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 the malware/grayware file dropped/downloaded by W2KM_DRIDEX.BYY. (Note: Please skip this step if the threat(s) listed below have already been removed.)

     
    • TSPY_DRIDEX.YYSRC

Step 3

Scan your computer with your Trend Micro product to delete files detected as W2KM_DRIDEX.BYY. 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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