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TROJ_ADOBDOCRO.A

May 28, 2014
 Analysis by: Jimelle Monteser
 ALIASES:

TrojanDownloader:W97M/Adobdocro.A (Microsoft), Trojan.Mdropper (Symantec), Trojan-Downloader.W97M.Adobdocro (Ikarus), DOC/TrojanDownloader.Agent.A (NOD32)

 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:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Dropped by other malware


This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

As of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size:

32,256 bytes

File Type:

MACRO, DOC

Memory Resident:

No

Initial Samples Received Date:

11 Mar 2014

Payload:

Displays message/message boxes

Arrival Details

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation

This Trojan creates the following folders:

  • %Application Data%\YQJPBOYJNVJ

(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.)

Download Routine

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

  • http://{BLOCKED}ia-films.com/cache/march10.exe

It saves the files it downloads using the following names:

  • %Application Data%\YQJPBOYJNVJ\EPOFYZMFZGJ.com

As of this writing, the said sites are inaccessible.

Other Details

This is the Trend Micro detection for Microsoft Word documents that are compromised through the insertion of a malicious macro.

NOTES:

Upon execution of the document, it displays the following message:

Resume
Please enable Editing and Macros to see resume.
*If you're previewing this online, you need to download and open it in Microsoft Office*

The message above is used to trick users to enable and execute the malicious macro.

  SOLUTION

Minimum Scan Engine:

9.700

FIRST VSAPI PATTERN FILE:

10.658.07

FIRST VSAPI PATTERN DATE:

11 Mar 2014

VSAPI OPR PATTERN File:

10.659.00

VSAPI OPR PATTERN Date:

12 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

Search and delete these folders

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.  
  • %Application Data%\YQJPBOYJNVJ

Step 3

Enable the macro virus protection in Microsoft Office Applications

[ Learn More ]

Step 4

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