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W2KM_DLOADER.AUSBX

October 28, 2016
 Analysis by: Michael Jay Villanueva
 ALIASES:

Troj/DocDl-FHB (Sophos); TrojanDropper:O97M/Zdowbot.A (Microsoft)

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

  TECHNICAL DETAILS

File Size:

148,480 bytes

File Type:

DOC

Memory Resident:

Yes

Initial Samples Received Date:

27 Oct 2016

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 adds the following processes:

  • explorer.exe

Download Routine

This Trojan saves the files it downloads using the following names:

  • %User Temp%\{random}.tmp

(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.)

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://api.{BLOCKED}y.org/
  • http://{BLOCKED}utat.com/ls5/gate.php
  • http://{BLOCKED}amuch.ru/ls5/gate.php
  • http://{BLOCKED}ginuse.ru/ls5/gate.php

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

12.862.07

FIRST VSAPI PATTERN DATE:

27 Oct 2016

VSAPI OPR PATTERN File:

12.863.00

VSAPI OPR PATTERN Date:

28 Oct 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

Restart in Safe Mode

[ Learn More ]

Step 4

Remove malware/grayware files dropped/downloaded by W2KM_DLOADER.AUSBX. (Note: Please skip this step if the threats listed below have already been removed.)

    Step 5

    Restart in normal mode and scan your computer with your Trend Micro product for files detected as W2KM_DLOADER.AUSBX. 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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