W97M_SHELLHIDE.A

April 02, 2014
 ALIASES:

Trojan:X97M/ShellHide.gen (Microsoft) , Trojan-Dropper.MSWord.Agent.gz (Kaspersky)

 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: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Spammed via email

This malware is involved in an April 2014 attack that leveraged a macro-enabled word document as a malicious spam attachment in order to infect machines with ZBOT malware. Users affected by this malware may find their online banking accounts compromised.

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

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

  TECHNICAL DETAILS

File Size:

317,951 bytes

File Type:

DOCX

Initial Samples Received Date:

19 Mar 2014

Arrival Details

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

Installation

This Trojan drops and executes the following files:

  • %User Profile%\BrhotakdNdVMM.exe - detected as TSPY_ZBOT.DOCM

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)

NOTES:

This document has a malicious macro script that drops and execute an embedded file when the document or workbook is opened.

  SOLUTION

Minimum Scan Engine:

9.700

FIRST VSAPI PATTERN FILE:

10.674.06

FIRST VSAPI PATTERN DATE:

19 Mar 2014

VSAPI OPR PATTERN File:

10.675.00

VSAPI OPR PATTERN Date:

20 Mar 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 the malware/grayware file dropped/downloaded by W97M_SHELLHIDE.A

Step 3

Scan your computer with your Trend Micro product to delete files detected as W97M_SHELLHIDE.A 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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