Analysis by: Homer Pacag
 PLATFORM:

Windows

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

  TECHNICAL DETAILS

File Size: 77,080 bytes
File Type: DOCX
Memory Resident: No
Initial Samples Received Date: 10 Jun 2016
Payload: Connects to URLs/IPs, Downloads files

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 component file(s):

  • %Application Data%\{random number}.vbs - component responsible for accessing a URL to download a file

(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming 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.)

Download Routine

Trend Micro detects the dowloaded file as:

Other Details

This Trojan connects to the following URL(s) to check for an Internet connection:

  • http://www.adobe.com

It does the following:

  • The dropped component %Application Data%\{random number}.vbs connects to the URL http://{BLOCKED}dalcontadino.com/abtuc.jpg?Pc=6862 to download and execute a file

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 12.582.07
FIRST VSAPI PATTERN DATE: 10 Jun 2016
VSAPI OPR PATTERN File: 12.583.00
VSAPI OPR PATTERN Date: 11 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

Remove the malware/grayware file dropped/downloaded by W2KM_CERBER.BZG. (Note: Please skip this step if the threat(s) listed below have already been removed.)

Step 4

Search and delete these files

[ 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.  
  • %Application Data%\{random number}.vbs

Step 5

Scan your computer with your Trend Micro product to delete files detected as W2KM_CERBER.BZG. 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 6

Enable the macro virus protection in Microsoft Office Applications

[ Learn More ]


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