TROJ_EMVIBS.A

 Analysis by: Jennifer Gumban

 ALIASES:

Trojan-Downloader.MSWord.Agent.aib (Kaspersky)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


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

It modifies the Internet Explorer Zone Settings.

  TECHNICAL DETAILS

File Size:

26,112 bytes

File Type:

DOC

Initial Samples Received Date:

26 May 2016

Arrival Details

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

Installation

This Trojan drops the following files:

  • %Temporary Internet Files%\{random folder}\{random folder}\{embedded file}.vbs

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

Web Browser Home Page and Search Page Modification

This Trojan modifies the Internet Explorer Zone Settings.

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}.{BLOCKED}.63.7/subid3.jpg?DKC=11
  • http://{BLOCKED}s.{BLOCKED}lformats.org/drawingml/2006/main

NOTES:
Document file embedded with VBS script that when user activates, it may exhibit possibly malicious activities.

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

12.552.07

FIRST VSAPI PATTERN DATE:

27 May 2016

VSAPI OPR PATTERN File:

12.553.00

VSAPI OPR PATTERN Date:

28 May 2016

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

Search and delete this file

[ 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.  
  • %Temporary Internet Files%\{random folder}\{random folder}\{embedded file}.vbs

Step 4

Reset Internet privacy settings

[ Learn More ]

Step 5

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