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W97M_FAKEUPS.A

November 22, 2014
 Analysis by: Anthony Joe Melgarejo
 ALIASES:

TrojanDownloader:O97M/Kudsica.A (Microsoft)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • 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:

21504 bytes

File Type:

DOC

Memory Resident:

No

Initial Samples Received Date:

17 Nov 2014

Payload:

Drops files

Arrival Details

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

Installation

This Trojan drops and executes the following files:

  • %Temp%\adobeacd-update.bat - detected as BAT_LOADR.FKUPS

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

Dropping Routine

This Trojan drops the following files:

  • %Temp%\adobeacd-update.vbs - detected as VBS_LOADR.FKUPS
  • %Temp%\adobeacd-update.ps1 - detected as VBS_DLOADR.FKUPS

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

  SOLUTION

Minimum Scan Engine:

9.700

FIRST VSAPI PATTERN FILE:

11.282.06

FIRST VSAPI PATTERN DATE:

17 Nov 2014

VSAPI OPR PATTERN File:

11.283.00

VSAPI OPR PATTERN Date:

18 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_FAKEUPS.A. (Note: Please skip this step if the threat(s) listed below have already been removed.)

     
    • BAT_LOADR.FKUPS
    • VBS_LOADR.FKUPS
    • VBS_DLOADR.FKUPS

Step 3

Scan your computer with your Trend Micro product to delete files detected as W97M_FAKEUPS.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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