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W97M_SHELLHIDE.B
Aliases: Trojan.Mdropper (Symantec), Troj/DocDrop-BX (Sophos)
Malware type: Trojan
Destructive: No
Platform: Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
Encrypted: No
In the wild: Yes

Overview


Infection Channel: Spammed via email

This malware leverages a macro-enabled word document as a malicious spam attachment in order to infect machines with a backdoor. The spammed email message is related to payment remittance.

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.

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

Technical Details


File size: 30,720 bytes
File type: DOC
Initial samples received date: 02 Apr 2014
Payload: Downloads files

Arrival Details

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

Download Routine

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

  • http://{BLOCKED}cu.com/{BLOCKED}ek/sb01ff.exe

It saves the files it downloads using the following names:

  • %Application Data%\APWARQFJESX.exe - detected as BKDR_NEUREVT.DCM

(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.)

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

NOTES:

This document has a malicious macro script that downloads and executes a malicious file when the document is opened.

Solution


Minimum scan engine: 9.700
VSAPI OPR Pattern Version: 10.703.00
VSAPI OPR Pattern Release Date: 03 Apr 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 malware/grayware files dropped/downloaded by W97M_SHELLHIDE.B

Step 3

Scan your computer with your Trend Micro product to delete files detected as W97M_SHELLHIDE.B. 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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Analysis By: Rhena Inocencio

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