Analysis by: Pearl Charlaine Espejo
ALIASES:

Exploit.MSWord.CVE-2012-0158.fx (Kaspersky); Exploit:Win32/CVE-2012-0158 (Microsoft); MSOffice/CVE_2015_1641.A!exploit (Fortinet); Exploit.CVE-2012-0158.Heur (Bkav)

 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.

  TECHNICAL DETAILS

Tamaño del archivo 487,123 bytes
Tipo de archivo RTF
Residente en memoria No
Fecha de recepción de las muestras iniciales 02 Jun 2016

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 Temp%\system.exe
  • %User Temp%\{random numbers}.bat

(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.)

  SOLUTION

Motor de exploración mínimo 9.800
Primer archivo de patrones de VSAPI 12.564.03
Primera fecha de publicación de patrones de VSAPI 02 Jun 2016
Versión de patrones OPR de VSAPI 12.565.00
Fecha de publicación de patrones OPR de VSAPI 03 Jun 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

Scan your computer with your Trend Micro product to delete files detected as TROJ_CVE20151641.BZC. 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.

Step 4

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.  
  • %User Temp%\system.exe
  • %User Temp%\{random numbers}.bat


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