TROJ_DOWNLOADER_0000119.TOMA

October 02, 2012
 ALIASES:

TrojanDownloader:Win32/Wintrim.BX (Microsoft); Downloader-BPJ.gen.b (McAfee); Trojan Horse (Symantec); Trojan-Downloader.Win32.Lipler.axkd (Kaspersky); Trojan-Downloader.Win32.Wintrim.bx (v) (Sunbelt); Adware:W32/Wintrim.gen!P (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.

  TECHNICAL DETAILS

File Size:

1,456,308 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

02 Oct 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:

  • %System Root%\DOCUME~1
  • %System Root%\DOCUME~1\ADMINI~1
  • %User Profile%\LOCALS~1
  • %User Temp%\nsr3.tmp
  • %Program Files%\Original-Solitaire
  • %Program Files%\Original-Solitaire\data
  • %Start Menu%\Programs\Original-Solitaire

(Note: %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.. %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003.. %Program Files% is the default Program Files folder, usually C:\Program Files.. %Start Menu% is the current user's Start Menu folder, which is usually C:\Windows\Profiles\{user name}\Start Menu on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu on Windows NT and C:\Windows\Start Menu or C:\Documents and Settings\{User name}\Start Menu 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\Run
lbaot = "%Application Data%\lbaot.exe lbaot"

Other System Modifications

This Trojan deletes the following files:

  • %User Temp%\nsw1.tmp
  • %User Temp%\nsr3.tmp

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003.)

It adds the following registry keys:

HKEY_LOCAL_MACHINE\Software\OriginalSolitaire

HKEY_CURRENT_USER\Software\OriginalSolitaire

HKEY_CURRENT_USER\Software\fcn

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
lbaot

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\OriginalSolitaire
dl_ams = "3"

HKEY_CURRENT_USER\Software\OriginalSolitaire
dl_ams = "3"

HKEY_LOCAL_MACHINE\SOFTWARE\OriginalSolitaire
grpid = "3508"

HKEY_CURRENT_USER\Software\OriginalSolitaire
grpid = "3508"

HKEY_LOCAL_MACHINE\SOFTWARE\OriginalSolitaire
installdt = "20100218"

HKEY_CURRENT_USER\Software\OriginalSolitaire
installdt = "20100218"

HKEY_CURRENT_USER\Software\OriginalSolitaire
uai = "http://www.{BLOCKED}al-solitaire.com/congratulation.php?grpid=3508"

HKEY_LOCAL_MACHINE\SOFTWARE\OriginalSolitaire
dl_browser = "IE"

HKEY_CURRENT_USER\Software\OriginalSolitaire
dl_browser = "IE"

HKEY_LOCAL_MACHINE\SOFTWARE\OriginalSolitaire
dl_hp_url = "http://www.{BLOCKED}lsucher.com/?t=Q1002183508&s=h"

HKEY_CURRENT_USER\Software\OriginalSolitaire
dl_hp_url = "http://www.{BLOCKED}lsucher.com/?t=Q1002183508&s=h"

HKEY_LOCAL_MACHINE\SOFTWARE\OriginalSolitaire
dl_se_name = "Schnell Sucher"

HKEY_CURRENT_USER\Software\OriginalSolitaire
dl_se_name = "Schnell Sucher"

HKEY_LOCAL_MACHINE\SOFTWARE\OriginalSolitaire
dl_se_url = "http://www.{BLOCKED}lsucher.com/result.php?t=Q1002183508&s=b&keywords={searchTerms}"

HKEY_CURRENT_USER\Software\OriginalSolitaire
dl_se_url = "http://www.{BLOCKED}lsucher.com/result.php?t=Q1002183508&s=b&keywords={searchTerms}"

HKEY_LOCAL_MACHINE\SOFTWARE\OriginalSolitaire
dl_se_icon = "http://www.{BLOCKED}lsucher.com/favicon.ico"

HKEY_CURRENT_USER\Software\OriginalSolitaire
dl_se_icon = "http://www.{BLOCKED}lsucher.com/favicon.ico"

HKEY_LOCAL_MACHINE\SOFTWARE\OriginalSolitaire
ss_res = "http://download.{BLOCKED}al-solitaire.com/ss.php?grpid=3508"

HKEY_CURRENT_USER\Software\OriginalSolitaire
ss_res = "http://download.{BLOCKED}al-solitaire.com/ss.php?grpid=3508"

HKEY_CURRENT_USER\Software\OriginalSolitaire
_status = "ok"

HKEY_CURRENT_USER\Software\OriginalSolitaire
uai = "http://www.{BLOCKED}al-solitaire.com/congratulation.php?grpid=3508&itype=1&res=1"

HKEY_LOCAL_MACHINE\SOFTWARE\OriginalSolitaire
sp_id = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\OriginalSolitaire
ApplicationVersionInstall = "1001"

HKEY_CURRENT_USER\Software\OriginalSolitaire
ApplicationVersionInstall = "1001"

HKEY_LOCAL_MACHINE\SOFTWARE\OriginalSolitaire
dl_lg = "EN"

HKEY_CURRENT_USER\Software\OriginalSolitaire
dl_lg = "EN"

HKEY_CURRENT_USER\Software\fcn
gid = "3508"

HKEY_CURRENT_USER\Software\fcn
cnid = "z5FkqepiSaSX0-JwyutNVA"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
lbaot
DisplayName = "Favorit"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
lbaot
UninstallString = "%Application Data%\lbaot.exe -uninstall"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
lbaot
NoRemove = "0"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
lbaot
NoModify = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
lbaot
NoRepair = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
WBEM\WDM
%System%\advapi32.dll[MofResourceName] = "{random characters}"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
WBEM\WDM
%System%\DRIVERS\ACPI.sys[ACPIMOFResource] = "{random characters}"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
WBEM\WDM
%System%\DRIVERS\mssmbios.sys[MofResource] = "{random characters}"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
WBEM\WDM
%System%\DRIVERS\intelppm.sys[PROCESSORWMI] = "{random characters}"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
WBEM\WDM
%System%\DRIVERS\ipnat.sys[IPNATMofResource] = "{random characters}"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
WBEM\WDM
%System%\Drivers\HTTP.sys[UlMofResource] = "{random characters}"

Dropping Routine

This Trojan drops the following files:

  • %User Temp%\nsl2.tmp
  • %User Temp%\nsr3.tmp\modern-header.bmp
  • %User Temp%\nsr3.tmp\modern-wizard.bmp
  • %User Temp%\nsr3.tmp\nsDialogs.dll
  • %User Temp%\nsr3.tmp\System.dll
  • %User Temp%\nsr3.tmp\header_OS.bmp
  • %User Temp%\nsr3.tmp\FavoritDE.rtf
  • %User Temp%\nsr3.tmp\FavoritEN.rtf
  • %User Temp%\nsr3.tmp\FavoritES.rtf
  • %User Temp%\nsr3.tmp\FavoritFR.rtf
  • %User Temp%\nsr3.tmp\FavoritIT.rtf
  • %Application Data%\lbaot.exe
  • %Program Files%\Original-Solitaire\data\translation_file_original_solitaire.xml
  • %Start Menu%\Programs\Original-Solitaire\Original-Solitaire.lnk
  • %Start Menu%\Programs\Original-Solitaire\Uninstall.lnk
  • %Desktop%\Original-Solitaire.lnk
  • %User Temp%\nsr3.tmp\NSISdl.dll
  • %User Temp%\Original-Solitaire_exe.dat
  • %Application Data%\lbaot.dat

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003.. %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.. %Program Files% is the default Program Files folder, usually C:\Program Files.. %Start Menu% is the current user's Start Menu folder, which is usually C:\Windows\Profiles\{user name}\Start Menu on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu on Windows NT and C:\Windows\Start Menu or C:\Documents and Settings\{User name}\Start Menu on Windows 2000, XP, and Server 2003.. %Desktop% is the current user's desktop, which is usually C:\Windows\Profiles\{user name}\Desktop on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Desktop on Windows NT, and C:\Documents and Settings\{User Name}\Desktop on Windows 2000, XP, and Server 2003.)

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://download.{BLOCKED}t-network.com/binaries/download.php

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

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_LOCAL_MACHINE\Software
    • OriginalSolitaire
  • In HKEY_CURRENT_USER\Software
    • OriginalSolitaire
  • In HKEY_CURRENT_USER\Software
    • fcn
  • In HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Uninstall
    • lbaot

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
    • lbaot = "%Application Data%\lbaot.exe lbaot"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\OriginalSolitaire
    • dl_ams = "3"
  • In HKEY_CURRENT_USER\Software\OriginalSolitaire
    • dl_ams = "3"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\OriginalSolitaire
    • grpid = "3508"
  • In HKEY_CURRENT_USER\Software\OriginalSolitaire
    • grpid = "3508"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\OriginalSolitaire
    • installdt = "20100218"
  • In HKEY_CURRENT_USER\Software\OriginalSolitaire
    • installdt = "20100218"
  • In HKEY_CURRENT_USER\Software\OriginalSolitaire
    • uai = "http://www.{BLOCKED}al-solitaire.com/congratulation.php?grpid=3508"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\OriginalSolitaire
    • dl_browser = "IE"
  • In HKEY_CURRENT_USER\Software\OriginalSolitaire
    • dl_browser = "IE"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\OriginalSolitaire
    • dl_hp_url = "http://www.{BLOCKED}lsucher.com/?t=Q1002183508&s=h"
  • In HKEY_CURRENT_USER\Software\OriginalSolitaire
    • dl_hp_url = "http://www.{BLOCKED}lsucher.com/?t=Q1002183508&s=h"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\OriginalSolitaire
    • dl_se_name = "Schnell Sucher"
  • In HKEY_CURRENT_USER\Software\OriginalSolitaire
    • dl_se_name = "Schnell Sucher"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\OriginalSolitaire
    • dl_se_url = "http://www.{BLOCKED}lsucher.com/result.php?t=Q1002183508&s=b&keywords={searchTerms}"
  • In HKEY_CURRENT_USER\Software\OriginalSolitaire
    • dl_se_url = "http://www.{BLOCKED}lsucher.com/result.php?t=Q1002183508&s=b&keywords={searchTerms}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\OriginalSolitaire
    • dl_se_icon = "http://www.{BLOCKED}lsucher.com/favicon.ico"
  • In HKEY_CURRENT_USER\Software\OriginalSolitaire
    • dl_se_icon = "http://www.{BLOCKED}lsucher.com/favicon.ico"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\OriginalSolitaire
    • ss_res = "http://download.{BLOCKED}al-solitaire.com/ss.php?grpid=3508"
  • In HKEY_CURRENT_USER\Software\OriginalSolitaire
    • ss_res = "http://download.{BLOCKED}al-solitaire.com/ss.php?grpid=3508"
  • In HKEY_CURRENT_USER\Software\OriginalSolitaire
    • _status = "ok"
  • In HKEY_CURRENT_USER\Software\OriginalSolitaire
    • uai = "http://www.{BLOCKED}al-solitaire.com/congratulation.php?grpid=3508&itype=1&res=1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\OriginalSolitaire
    • sp_id = "1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\OriginalSolitaire
    • ApplicationVersionInstall = "1001"
  • In HKEY_CURRENT_USER\Software\OriginalSolitaire
    • ApplicationVersionInstall = "1001"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\OriginalSolitaire
    • dl_lg = "EN"
  • In HKEY_CURRENT_USER\Software\OriginalSolitaire
    • dl_lg = "EN"
  • In HKEY_CURRENT_USER\Software\fcn
    • gid = "3508"
  • In HKEY_CURRENT_USER\Software\fcn
    • cnid = "z5FkqepiSaSX0-JwyutNVA"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\lbaot
    • DisplayName = "Favorit"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\lbaot
    • UninstallString = "%Application Data%\lbaot.exe -uninstall"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\lbaot
    • NoRemove = "0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\lbaot
    • NoModify = "1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\lbaot
    • NoRepair = "1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WBEM\WDM
    • %System%\advapi32.dll[MofResourceName] = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WBEM\WDM
    • %System%\DRIVERS\ACPI.sys[ACPIMOFResource] = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WBEM\WDM
    • %System%\DRIVERS\mssmbios.sys[MofResource] = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WBEM\WDM
    • %System%\DRIVERS\intelppm.sys[PROCESSORWMI] = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WBEM\WDM
    • %System%\DRIVERS\ipnat.sys[IPNATMofResource] = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WBEM\WDM
    • %System%\Drivers\HTTP.sys[UlMofResource] = "{random characters}"

Step 5

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.
  • %User Temp%\nsl2.tmp
  • %User Temp%\nsr3.tmp\modern-header.bmp
  • %User Temp%\nsr3.tmp\modern-wizard.bmp
  • %User Temp%\nsr3.tmp\nsDialogs.dll
  • %User Temp%\nsr3.tmp\System.dll
  • %User Temp%\nsr3.tmp\header_OS.bmp
  • %User Temp%\nsr3.tmp\FavoritDE.rtf
  • %User Temp%\nsr3.tmp\FavoritEN.rtf
  • %User Temp%\nsr3.tmp\FavoritES.rtf
  • %User Temp%\nsr3.tmp\FavoritFR.rtf
  • %User Temp%\nsr3.tmp\FavoritIT.rtf
  • %Application Data%\lbaot.exe
  • %Program Files%\Original-Solitaire\data\translation_file_original_solitaire.xml
  • %Start Menu%\Programs\Original-Solitaire\Original-Solitaire.lnk
  • %Start Menu%\Programs\Original-Solitaire\Uninstall.lnk
  • %Desktop%\Original-Solitaire.lnk
  • %User Temp%\nsr3.tmp\NSISdl.dll
  • %User Temp%\Original-Solitaire_exe.dat
  • %Application Data%\lbaot.dat

Step 6

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.
  • %System Root%\DOCUME~1
  • %System Root%\DOCUME~1\ADMINI~1
  • %User Profile%\LOCALS~1
  • %User Temp%\nsr3.tmp
  • %Program Files%\Original-Solitaire
  • %Program Files%\Original-Solitaire\data
  • %Start Menu%\Programs\Original-Solitaire

Step 7

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_DOWNLOADER_0000119.TOMA. 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 8

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.

  • %User Temp%\nsw1.tmp
  • %User Temp%\nsr3.tmp


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