W97M_DLOADER.AI

November 08, 2014
 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.

It executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.

  TECHNICAL DETAILS

File Size:

260,096 bytes

File Type:

DOC

Initial Samples Received Date:

06 Nov 2014

Payload:

Drops files

Arrival Details

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

Dropping Routine

This Trojan drops the following files:

  • %Temp%\adobeacd-update.bat - used to execute VBS_POWRUN.KG
  • %Temp%\adobeacd-update.vbs - detected as VBS_POWRUN.KG. This is used to raise privilege and execute TROJ_POWDLOD.GN
  • %Temp%\adobeacd-update.ps1 - detected as TROJ_POWDLOD.GN

(Note: %Temp% is the Windows temporary folder, where it usually is C:\Windows\Temp on all Windows operating system versions.)

It executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.

  SOLUTION

Minimum Scan Engine:

9.700

FIRST VSAPI PATTERN FILE:

11.260.05

FIRST VSAPI PATTERN DATE:

06 Nov 2014

VSAPI OPR PATTERN File:

11.261.00

VSAPI OPR PATTERN Date:

07 Nov 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

Remove the malware/grayware file dropped/downloaded by W97M_DLOADER.AI. (Note: Please skip this step if the threat(s) listed below have already been removed.)

     
    • VBS_POWRUN.KG
    • TROJ_POWDLOD.GN

Step 3

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.
  • %Temp%\adobeacd-update.bat

Step 4

Scan your computer with your Trend Micro product to delete files detected as W97M_DLOADER.AI. 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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