TROJ_MOTMOT.B

October 09, 2012
 Analysis by: Sabrina Lei Sioting
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes


  TECHNICAL DETAILS

File Size:

1,051,528 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

05 Jul 2011

Installation

This Trojan drops the following files:

  • %Application Data%\Microsoft\IME\V2005\PHIME2002A.exe

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Windows\Profiles\{user name}\Application Data on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Application Data on Windows NT, and C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003.)

It creates the following folders:

  • %Application Data%\Microsoft\IME
  • %Application Data%\Microsoft\IME\V2005

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Windows\Profiles\{user name}\Application Data on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Application Data on Windows NT, and C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003.)

Autostart Technique

This Trojan adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\RunOnce
{file name}.exe = "{folder where malware is executed}\{file name}.exe"

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}codecenter.org/major/images/view.php
  • http://{BLOCKED}codecenter.org/major/txt/read.php
  • http://{BLOCKED}icalcomfort.net/major/images/view.php

  SOLUTION

Minimum Scan Engine:

8.900

FIRST VSAPI PATTERN FILE:

8.268.06

FIRST VSAPI PATTERN DATE:

05 Jul 2011

VSAPI OPR PATTERN File:

8.269.00

VSAPI OPR PATTERN Date:

05 Jul 2011

Step 1

For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

Step 2

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunOnce
    • {file name}.exe = {folder where malware is executed}\{file name}.exe

Step 3

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%\Microsoft\IME

Step 4

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