TROJ_DLOADR.JS


 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • 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:

257,616 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

14 Oct 2013

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 creates the following folders:

  • %User Profile%\Application Data\Window modus

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)

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\Run
Window modus = "%User Profile%\Window modus\Window modus.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
Window modus = "%User Profile%\Window modus\Window modus.exe"

Other System Modifications

This Trojan adds the following registry keys:

HKEY_CURRENT_USER\SOFTWARE\GOMSEK.COM\
Window modus

HKEY_CURRENT_USER\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Window modus

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
AppID\{FD532C54-FC82-4C97-9E7C-FB4397203A44}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
AppID\WindowmodusUpdateService.EXE

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{2402B2ED-0F0A-4E5F-89A2-8BD09140352C}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{2402B2ED-0F0A-4E5F-89A2-8BD09140352C}\1.0

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{2402B2ED-0F0A-4E5F-89A2-8BD09140352C}\1.0\
FLAGS

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{2402B2ED-0F0A-4E5F-89A2-8BD09140352C}\1.0\
0

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{2402B2ED-0F0A-4E5F-89A2-8BD09140352C}\1.0\
0\win32

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{2402B2ED-0F0A-4E5F-89A2-8BD09140352C}\1.0\
HELPDIR

It adds the following registry entries:

HKEY_CURRENT_USER\Software\GOMSEK.COM\
Window modus
ProgID = "ABC064E82E789440B4702CDE356B5FA2"

HKEY_CURRENT_USER\Software\GOMSEK.COM\
Window modus
Owner = "k3000"

HKEY_CURRENT_USER\Software\GOMSEK.COM\
Window modus
Version = "1309300"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
Window modus
DisplayName = "Window modus"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
Window modus
Publisher = "°Ë»ö´åÄÄ"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
Window modus
UninstallString = "%User Profile%\Window modus\Window modus.exe -uninstall"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
AppID\WindowmodusUpdateService.EXE
AppID = "{FD532C54-FC82-4C97-9E7C-FB4397203A44}"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
AppID\{FD532C54-FC82-4C97-9E7C-FB4397203A44}
LocalService = "WindowmodusUpdateService"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
AppID\{FD532C54-FC82-4C97-9E7C-FB4397203A44}
ServiceParameters = "-Service"

Dropping Routine

This Trojan drops the following files:

  • %User Profile%\Window modus\Window modus.exe
  • %User Profile%\Window modus\WindowmodusUpdateService.exe

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://directkeyword.{BLOCKED}o.kr/daemon/ServiceReport.php?m=0050569F1F02&t=I&q=
  • http://directkeyword.{BLOCKED}o.kr/daemon/ServiceReport.php?m=0050569F1F02&t=B
  • http://directkeyword.{BLOCKED}o.kr/daemon/SetActiveCount_new.php?{random characters}
  • http://directkeyword.{BLOCKED}o.kr/update/install2.php?{random characters}
  • http://directkeyword.{BLOCKED}o.kr/{BLOCKED}onfig/set.ini

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.300

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

Restart in Safe Mode

[ Learn More ]

Step 3

Delete this registry key

[ 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\GOMSEK.COM
    • Window modus
  • In HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall
    • Window modus
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\AppID
    • {FD532C54-FC82-4C97-9E7C-FB4397203A44}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\AppID
    • WindowmodusUpdateService.EXE
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib
    • {2402B2ED-0F0A-4E5F-89A2-8BD09140352C}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{2402B2ED-0F0A-4E5F-89A2-8BD09140352C}
    • 1.0
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{2402B2ED-0F0A-4E5F-89A2-8BD09140352C}\1.0
    • FLAGS
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{2402B2ED-0F0A-4E5F-89A2-8BD09140352C}\1.0
    • 0
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{2402B2ED-0F0A-4E5F-89A2-8BD09140352C}\1.0\0
    • win32
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{2402B2ED-0F0A-4E5F-89A2-8BD09140352C}\1.0
    • HELPDIR

Step 4

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\Run
    • Window modus = "%User Profile%\Window modus\Window modus.exe"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    • Window modus = "%User Profile%\Window modus\Window modus.exe"
  • In HKEY_CURRENT_USER\Software\GOMSEK.COM\Window modus
    • ProgID = "ABC064E82E789440B4702CDE356B5FA2"
  • In HKEY_CURRENT_USER\Software\GOMSEK.COM\Window modus
    • Owner = "k3000"
  • In HKEY_CURRENT_USER\Software\GOMSEK.COM\Window modus
    • Version = "1309300"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Uninstall\Window modus
    • DisplayName = "Window modus"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Uninstall\Window modus
    • Publisher = "°Ë»ö´åÄÄ"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Uninstall\Window modus
    • UninstallString = "%User Profile%\Window modus\Window modus.exe -uninstall"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\AppID\WindowmodusUpdateService.EXE
    • AppID = "{FD532C54-FC82-4C97-9E7C-FB4397203A44}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\AppID\{FD532C54-FC82-4C97-9E7C-FB4397203A44}
    • LocalService = "WindowmodusUpdateService"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\AppID\{FD532C54-FC82-4C97-9E7C-FB4397203A44}
    • ServiceParameters = "-Service"

Step 5

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.
  • %User Profile%\Window modus\Window modus.exe
  • %User Profile%\Window modus\WindowmodusUpdateService.exe

Step 6

Search and delete this folder

[ 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.
  • %User Profile%\Application Data\Window modus

Step 7

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