TROJ_STARTP.SML1


 ALIASES:

TrojanDropper:Win32/Startpage.B (Microsoft); StartPage-MT (McAfee); Trojan.Gen (Symantec); Trojan-Dropper.Win32.StartPage.arr, Trojan-Dropper.Win32.StartPage.arr (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Dropped:Trojan.BHO.OHM (FSecure)

 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.

It deletes itself after execution.

  TECHNICAL DETAILS

File Size:

829,042 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

06 May 2012

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:

  • %Program Files%\xyladid
  • %Program Files%\Adobe\Motorola\Internt Explorer
  • %Program Files%\Adobe\Motorola
  • %Program Files%\Windows WinSxs\Windows msagent\Java
  • %Program Files%\Windows WinSxs
  • %Program Files%\Windows WinSxs\Windows msagent
  • %Program Files%\RealOne\Intel\Windows system
  • %Program Files%\RealOne
  • %Program Files%\RealOne\Intel
  • %Program Files%\Windows Log\Maxthon\Windows Live
  • %Program Files%\Windows Log
  • %Program Files%\Windows Log\Maxthon

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files.)

Autostart Technique

This Trojan registers itself as a BHO to ensure its automatic execution every time Internet Explorer is used by adding the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Browser Helper Objects\{0C7C23EF-A848-485B-873C-0ED954731014}

Other System Modifications

This Trojan deletes the following files:

  • install_17.jse

It adds the following registry keys:

HKEY_CLASSES_ROOT\CLSID\{0C7C23EF-A848-485B-873C-0ED954731014}

HKEY_CLASSES_ROOT\CLSID\{0C7C23EF-A848-485B-873C-0ED954731014}\
InprocServer32

HKEY_CLASSES_ROOT\.wonnbcq

HKEY_CLASSES_ROOT\ddmqj

HKEY_CLASSES_ROOT\ddmqj\ScriptEngine

HKEY_CLASSES_ROOT\ddmqj\CLSID

HKEY_CLASSES_ROOT\ddmqj\shell

HKEY_CLASSES_ROOT\ddmqj\shell\
open\command

HKEY_CLASSES_ROOT\CLSID\{1f4de370-d627-11d1-ba4f-00a0c91eedba}\
shell

HKEY_CLASSES_ROOT\CLSID\{1f4de370-d627-11d1-ba4f-00a0c91eedba}\
shell\????

HKEY_CLASSES_ROOT\CLSID\{1f4de370-d627-11d1-ba4f-00a0c91eedba}\
shell\????\Command

HKEY_CLASSES_ROOT\CLSID\{1f4de370-d627-11d1-ba4f-00a0c91eedba}\
shell\??(&R)

HKEY_CLASSES_ROOT\CLSID\{e17d4fc0-5564-11d1-83f2-00a0c90dc849}\
shell

HKEY_CLASSES_ROOT\CLSID\{e17d4fc0-5564-11d1-83f2-00a0c90dc849}\
shell\????

HKEY_CLASSES_ROOT\CLSID\{e17d4fc0-5564-11d1-83f2-00a0c90dc849}\
shell\????\Command

HKEY_CLASSES_ROOT\CLSID\{e17d4fc0-5564-11d1-83f2-00a0c90dc849}\
shell\??(&R)

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{0C7C23EF-A848-485B-873C-0ED954731014}\InprocServer32
ThreadingModel = "Apartment"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{1f4de370-d627-11d1-ba4f-00a0c91eedba}
InfoTip = "@shdoclc.dll,-880"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{1f4de370-d627-11d1-ba4f-00a0c91eedba}\shell\
????
MUIVerb = "@shdoclc.dll,-10241"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{1f4de370-d627-11d1-ba4f-00a0c91eedba}\shell\
??(&R)
Command = "rundll32.exe shell32.dll,Control_RunDLL INETCPL.CPL,,0"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{e17d4fc0-5564-11d1-83f2-00a0c90dc849}
InfoTip = "@shdoclc.dll,-880"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{e17d4fc0-5564-11d1-83f2-00a0c90dc849}\shell\
????
MUIVerb = "@shdoclc.dll,-10241"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{e17d4fc0-5564-11d1-83f2-00a0c90dc849}\shell\
??(&R)
Command = "rundll32.exe shell32.dll,Control_RunDLL INETCPL.CPL,,0"

It modifies the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{1f4de370-d627-11d1-ba4f-00a0c91eedba}
LocalizedString = "@shdoclc.dll,-880"

(Note: The default value data of the said registry entry is {random values}.)

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{1f4de370-d627-11d1-ba4f-00a0c91eedba}\InProcServer32
ThreadingModel = "Apartment"

(Note: The default value data of the said registry entry is Apartment.)

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{1f4de370-d627-11d1-ba4f-00a0c91eedba}\ShellFolder
Attributes = "0"

(Note: The default value data of the said registry entry is 20180000.)

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{e17d4fc0-5564-11d1-83f2-00a0c90dc849}
LocalizedString = "???"

(Note: The default value data of the said registry entry is {random values}.)

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{e17d4fc0-5564-11d1-83f2-00a0c90dc849}\InProcServer32
ThreadingModel = "Apartment"

(Note: The default value data of the said registry entry is Apartment.)

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{e17d4fc0-5564-11d1-83f2-00a0c90dc849}\ShellFolder
Attributes = "0"

(Note: The default value data of the said registry entry is 20180000.)

Dropping Routine

This Trojan drops the following files:

  • %Program Files%\xyladid\install_17.jse
  • %Program Files%\xyladid\tao.ico
  • %Program Files%\xyladid\game.ico
  • %Program Files%\xyladid\apple.dll
  • %System Root%\id.txt
  • %Program Files%\Adobe\Motorola\Internt Explorer\msexch40.jse
  • %Program Files%\Windows WinSxs\Windows msagent\Java\dxtmsft.jse
  • %Program Files%\Adobe\Motorola\Internt Explorer\1.txt
  • %Program Files%\Windows WinSxs\Windows msagent\Java\1.txt
  • %Program Files%\Windows Log\Maxthon\Windows Live\1.dat
  • %Program Files%\RealOne\Intel\Windows system\s.cmd
  • %Program Files%\Adobe\Motorola\Internt Explorer\wmsdmod.wonnbcq
  • %Program Files%\RealOne\Intel\Windows system\m.txt
  • %Program Files%\Adobe\Motorola\Internt Explorer\game.ico
  • %Program Files%\Adobe\Motorola\Internt Explorer\tao.ico
  • %Program Files%\Windows Log\Maxthon\Windows Live\d3dxof.dll
  • %Program Files%\RealOne\Intel\Windows system\a
  • %Program Files%\RealOne\Intel\Windows system\b
  • %Program Files%\RealOne\Intel\Windows system\d
  • %Program Files%\RealOne\Intel\Windows system\e
  • %User Profile%\????????\wmsdmod.wonnbcq

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files.. %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.)

Other Details

This Trojan deletes itself after execution.

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.200

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

Close all opened browser windows

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_CLASSES_ROOT\CLSID
    • {0C7C23EF-A848-485B-873C-0ED954731014}
  • In HKEY_CLASSES_ROOT\CLSID\{0C7C23EF-A848-485B-873C-0ED954731014}
    • InprocServer32
  • In HKEY_CLASSES_ROOT
    • .wonnbcq
  • In HKEY_CLASSES_ROOT
    • ddmqj
  • In HKEY_CLASSES_ROOT\ddmqj
    • ScriptEngine
  • In HKEY_CLASSES_ROOT\ddmqj
    • CLSID
  • In HKEY_CLASSES_ROOT\ddmqj
    • shell
  • In HKEY_CLASSES_ROOT\ddmqj\shell\open
    • command
  • In HKEY_CLASSES_ROOT\CLSID\{1f4de370-d627-11d1-ba4f-00a0c91eedba}
    • shell
  • In HKEY_CLASSES_ROOT\CLSID\{1f4de370-d627-11d1-ba4f-00a0c91eedba}\shell
    • ????
  • In HKEY_CLASSES_ROOT\CLSID\{1f4de370-d627-11d1-ba4f-00a0c91eedba}\shell\????
    • Command
  • In HKEY_CLASSES_ROOT\CLSID\{1f4de370-d627-11d1-ba4f-00a0c91eedba}\shell
    • ??(&R)
  • In HKEY_CLASSES_ROOT\CLSID\{e17d4fc0-5564-11d1-83f2-00a0c90dc849}
    • shell
  • In HKEY_CLASSES_ROOT\CLSID\{e17d4fc0-5564-11d1-83f2-00a0c90dc849}\shell
    • ????
  • In HKEY_CLASSES_ROOT\CLSID\{e17d4fc0-5564-11d1-83f2-00a0c90dc849}\shell\????
    • Command
  • In HKEY_CLASSES_ROOT\CLSID\{e17d4fc0-5564-11d1-83f2-00a0c90dc849}\shell
    • ??(&R)

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_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{0C7C23EF-A848-485B-873C-0ED954731014}\InprocServer32
    • ThreadingModel = "Apartment"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{1f4de370-d627-11d1-ba4f-00a0c91eedba}
    • InfoTip = "@shdoclc.dll,-880"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{1f4de370-d627-11d1-ba4f-00a0c91eedba}\shell\????
    • MUIVerb = "@shdoclc.dll,-10241"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{1f4de370-d627-11d1-ba4f-00a0c91eedba}\shell\??(&R)
    • Command = "rundll32.exe shell32.dll,Control_RunDLL INETCPL.CPL,,0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{e17d4fc0-5564-11d1-83f2-00a0c90dc849}
    • InfoTip = "@shdoclc.dll,-880"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{e17d4fc0-5564-11d1-83f2-00a0c90dc849}\shell\????
    • MUIVerb = "@shdoclc.dll,-10241"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{e17d4fc0-5564-11d1-83f2-00a0c90dc849}\shell\??(&R)
    • Command = "rundll32.exe shell32.dll,Control_RunDLL INETCPL.CPL,,0"

Step 5

Restore this modified 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_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{1f4de370-d627-11d1-ba4f-00a0c91eedba}
    • From: LocalizedString = "@shdoclc.dll,-880"
      To: LocalizedString = ""{random values}""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{1f4de370-d627-11d1-ba4f-00a0c91eedba}\InProcServer32
    • From: ThreadingModel = "Apartment"
      To: ThreadingModel = ""Apartment""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{1f4de370-d627-11d1-ba4f-00a0c91eedba}\ShellFolder
    • From: Attributes = "0"
      To: Attributes = ""20180000""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{e17d4fc0-5564-11d1-83f2-00a0c90dc849}
    • From: LocalizedString = "???"
      To: LocalizedString = ""{random values}""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{e17d4fc0-5564-11d1-83f2-00a0c90dc849}\InProcServer32
    • From: ThreadingModel = "Apartment"
      To: ThreadingModel = ""Apartment""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{e17d4fc0-5564-11d1-83f2-00a0c90dc849}\ShellFolder
    • From: Attributes = "0"
      To: Attributes = ""20180000""

Step 6

Search and delete these files

[ Learn More ]
There may be some component 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.
  • %Program Files%\xyladid\install_17.jse
  • %Program Files%\xyladid\tao.ico
  • %Program Files%\xyladid\game.ico
  • %Program Files%\xyladid\apple.dll
  • %System Root%\id.txt
  • %Program Files%\Adobe\Motorola\Internt Explorer\msexch40.jse
  • %Program Files%\Windows WinSxs\Windows msagent\Java\dxtmsft.jse
  • %Program Files%\Adobe\Motorola\Internt Explorer\1.txt
  • %Program Files%\Windows WinSxs\Windows msagent\Java\1.txt
  • %Program Files%\Windows Log\Maxthon\Windows Live\1.dat
  • %Program Files%\RealOne\Intel\Windows system\s.cmd
  • %Program Files%\Adobe\Motorola\Internt Explorer\wmsdmod.wonnbcq
  • %Program Files%\RealOne\Intel\Windows system\m.txt
  • %Program Files%\Adobe\Motorola\Internt Explorer\game.ico
  • %Program Files%\Adobe\Motorola\Internt Explorer\tao.ico
  • %Program Files%\Windows Log\Maxthon\Windows Live\d3dxof.dll
  • %Program Files%\RealOne\Intel\Windows system\a
  • %Program Files%\RealOne\Intel\Windows system\b
  • %Program Files%\RealOne\Intel\Windows system\d
  • %Program Files%\RealOne\Intel\Windows system\e
  • %User Profile%\????????\wmsdmod.wonnbcq

Step 7

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.
  • %Program Files%\xyladid
  • %Program Files%\Adobe\Motorola\Internt Explorer
  • %Program Files%\Adobe\Motorola
  • %Program Files%\Windows WinSxs\Windows msagent\Java
  • %Program Files%\Windows WinSxs
  • %Program Files%\Windows WinSxs\Windows msagent
  • %Program Files%\RealOne\Intel\Windows system
  • %Program Files%\RealOne
  • %Program Files%\RealOne\Intel
  • %Program Files%\Windows Log\Maxthon\Windows Live
  • %Program Files%\Windows Log
  • %Program Files%\Windows Log\Maxthon

Step 8

Scan your computer with your Trend Micro product to delete files detected as TROJ_STARTP.SML1. 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.

Step 9

Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.

  • install_17.jse


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