Analysis by: Cris Nowell Pantanilla
 Modified by: Ryan Gardo


W97M/Downloader.adx(McAfee), Troj/DocDl-EU(Sophos),




  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes


Infection Channel: Via email

This is macro-based malware that employed a bogus Air Canada e-ticket with an attached .DOC file. The said .DOC file attachment pretends to contain airline information. Once users open this .DOC file, it leads to a document with a malicious macro.

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 mass-mailed by other malware/grayware or malicious users.


File Size: 76,800 bytes
File Type: DOC
Memory Resident: No
Initial Samples Received Date: 02 Mar 2015
Payload: Connects to URLs/IPs, Downloads files

Arrival Details

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


Once the malicous document is opened, the macro which contains the malware code executes and drops the following files:

  • For OS versions XP and below:
    • %Temp%\adobeacd-update.bat
    • %Temp%\adobeacd-updatexp.vbs
  • For OS versions Vista and above:
    • %User Temp%\adobeacd-update.vbs
    • %User Temp%\adobeacd-update.bat
    • %User Temp%\adobeacd-update.ps1

The file adobeacd-updatexp.vbs and adobeacd-update.ps1 accesses the following links to download files:

  • http://{BLOCKED} (For OS Version XP and below)
  • http://{BLOCKED} (For OS Version Vista and above)
  • http://{BLOCKED}.{BLOCKED}.131.73/ca/file.pif

The malware saves the file using the following filename:

  • %Temp%\444.exe - For OS Verion XP and below (Detected as TROJ_HANCITOR.VVQB)
  • %User Temp%\444.exe - For OS Verion Vista and above (Detected as TROJ_HANCITOR.VVQB)
  • %User Temp%\444.jpg - For OS Version Vista and above

For OS versions XP and below, the file adobeacd-update.bat executes adobeacd-updatexp.vbs and the downloaded file %Temp\444.exe%. It also deletes itself after execution.

For OS versions Vista and above, the file adobeacd-update.bat executes adobeacd-update.vbs, which in turn, executes adobeacd-update.ps1. The file adobeacd-update.ps1 ensures that the downloaded file is executed and deletes all dropped files after execution.


Minimum Scan Engine: 9.750
VSAPI OPR PATTERN File: 11.505.00
VSAPI OPR PATTERN Date: 28 Feb 2015

Step 1

Remove the malware/grayware file that dropped/downloaded W2KM_BARTALEX.EU. (Note: Please skip this step if the threat(s) listed below have already been removed.)


Step 2

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 3

Search and delete these components

[ Learn More ]
There may be some components 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.
  • %Temp%\adobeacd-update.bat (For OS Version XP and below)
  • %Temp%\adobeacd-updatexp.vbs (For OS Version XP and below)
  • %User Temp%\adobeacd-update.vbs (For OS Version Vista and above)
  • %User Temp%\adobeacd-update.bat (For OS Version Vista and above)
  • %User Temp%\adobeacd-update.ps1 (For OS Version Vista and above)

Step 4

Scan your computer with your Trend Micro product to delete files detected as W2KM_BARTALEX.EU. 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 the following Trend Micro Support pages for more information:

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