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TROJ_LIPLER.SMAO

October 10, 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); ERROR (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:

740,839 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

20 Sep 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\Wilbert
  • %User Profile%\LOCALS~1
  • %User Temp%\nsi3.tmp

(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.)

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
qlojmgjt = "%Application Data%\qlojmgjt.exe qlojmgjt"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
iexsoqmg = "%Application Data%\iexsoqmg.exe iexsoqmg"

Other System Modifications

This Trojan deletes the following files:

  • %User Temp%\nsh1.tmp
  • %User Temp%\nsi3.tmp
  • %Application Data%\qlojmgjt_navtmp.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.)

It adds the following registry keys:

HKEY_LOCAL_MACHINE\Software\Speed-Downloading

HKEY_CURRENT_USER\Software\Speed-Downloading

HKEY_CURRENT_USER\Software\fcn

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
qlojmgjt

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
iexsoqmg

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Speed-Downloading
dl_lg = "3Dde"

HKEY_CURRENT_USER\Software\Speed-Downloading
dl_lg = "3Dde"

HKEY_LOCAL_MACHINE\SOFTWARE\Speed-Downloading
grpid = "1591"

HKEY_CURRENT_USER\Software\Speed-Downloading
grpid = "1591"

HKEY_LOCAL_MACHINE\SOFTWARE\Speed-Downloading
installdt = "20100223"

HKEY_CURRENT_USER\Software\Speed-Downloading
installdt = "20100223"

HKEY_CURRENT_USER\Software\Speed-Downloading
uai = "http://www.{BLOCKED}downloading.com/congratulation.php?lg=3Dde&grpid=1591"

HKEY_LOCAL_MACHINE\SOFTWARE\Speed-Downloading
dl_browser = "IE"

HKEY_CURRENT_USER\Software\Speed-Downloading
dl_browser = "IE"

HKEY_LOCAL_MACHINE\SOFTWARE\Speed-Downloading
dl_hp_url = "http://www.{BLOCKED}lsucher.com/?t=Q100223&s=h"

HKEY_CURRENT_USER\Software\Speed-Downloading
dl_hp_url = "http://www.{BLOCKED}lsucher.com/?t=Q100223&s=h"

HKEY_LOCAL_MACHINE\SOFTWARE\Speed-Downloading
dl_se_name = "Schnell Sucher"

HKEY_CURRENT_USER\Software\Speed-Downloading
dl_se_name = "Schnell Sucher"

HKEY_LOCAL_MACHINE\SOFTWARE\Speed-Downloading
dl_se_url = "http://www.{BLOCKED}lsucher.com/result.php?t=Q100223&s=b&keywords={searchTerms}"

HKEY_CURRENT_USER\Software\Speed-Downloading
dl_se_url = "http://www.{BLOCKED}lsucher.com/result.php?t=Q100223&s=b&keywords={searchTerms}"

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

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

HKEY_LOCAL_MACHINE\SOFTWARE\Speed-Downloading
ss_res = "http://download.{BLOCKED}downloading.com/ss.php?lg=3Dde&grpid=1591"

HKEY_CURRENT_USER\Software\Speed-Downloading
ss_res = "http://download.{BLOCKED}downloading.com/ss.php?lg=3Dde&grpid=1591"

HKEY_CURRENT_USER\Software\Speed-Downloading
_status = "ok"

HKEY_CURRENT_USER\Software\Speed-Downloading
uai = "http://www.{BLOCKED}downloading.com/congratulation.php?lg=3Dde&grpid=1591&itype=1&res=1"

HKEY_LOCAL_MACHINE\SOFTWARE\Speed-Downloading
sp_id = "1"

HKEY_CURRENT_USER\Software\Speed-Downloading
ss_res = "http://download.{BLOCKED}downloading.com/ss.php?lg=3Dde&grpid=1591&res=2"

HKEY_CURRENT_USER\Software\fcn
gid = "1591"

HKEY_CURRENT_USER\Software\fcn
cnid = "DScHlhcxRj23tbAtutHsCg"

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

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

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

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

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

HKEY_CURRENT_USER\Software\fcn
idt = "201209200504"

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

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

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

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

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

It modifies the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
DirectDraw\MostRecentApplication
Name = "iexplore.exe"

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
DirectDraw\MostRecentApplication
ID = "4117b81"

(Note: The default value data of the said registry entry is 41107b81.)

It deletes the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
qlojmgjt

Dropping Routine

This Trojan drops the following files:

  • %User Temp%\nsh2.tmp
  • %User Temp%\nsi3.tmp\modern-header.bmp
  • %User Temp%\nsi3.tmp\modern-wizard.bmp
  • %User Temp%\nsi3.tmp\nsDialogs.dll
  • %User Temp%\nsi3.tmp\System.dll
  • %User Temp%\nsi3.tmp\SD_header.bmp
  • %User Temp%\nsi3.tmp\FavoritDE.rtf
  • %User Temp%\nsi3.tmp\FavoritEN.rtf
  • %User Temp%\nsi3.tmp\FavoritES.rtf
  • %User Temp%\nsi3.tmp\FavoritFR.rtf
  • %User Temp%\nsi3.tmp\FavoritIT.rtf
  • %Application Data%\qlojmgjt.exe
  • %User Temp%\nsi3.tmp\inetc.dll
  • %User Temp%\SD_setup_dat
  • %User Temp%\nsi3.tmp\ExtractDLL.dll
  • %User Temp%\Speed-Downloading_setup.exe
  • %User Temp%\nsi3.tmp\searchsolverlogo_FR.bmp
  • %User Temp%\nsi3.tmp\searchsolverlogo_EN.bmp
  • %User Temp%\nsi3.tmp\searchsolverlogo_DE.bmp
  • %User Temp%\nsi3.tmp\searchsolverlogo_ES.bmp
  • %User Temp%\nsi3.tmp\searchsolverlogo_IT.bmp
  • %User Temp%\nsi3.tmp\NSISdl.dll
  • 65826
  • %Application Data%\qlojmgjt.dat
  • %Application Data%\qlojmgjt_navps.dat
  • %Application Data%\qlojmgjt_m2s.xml
  • %Application Data%\qlojmgjt_m2s.zl
  • %Application Data%\qlojmgjt_s2m.zl
  • %Application Data%\qlojmgjt_s2m.xml
  • %Application Data%\iexsoqmg.exe
  • %Application Data%\qlojmgjt_navup.dat
  • %Application Data%\iexsoqmg.dat
  • %Application Data%\iexsoqmg_navps.dat
  • %Application Data%\iexsoqmg_nav.dat
  • %Application Data%\iexsoqmg_navup.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.)

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://download.{BLOCKED}t-network.com/binaries/download.php
  • http://download.{BLOCKED}downloading.com/Speed-Downloading_download.php?file=SD_setup_dat
  • http://download.{BLOCKED}downloading.com/sa/cpi.php?{random characters}
  • http://download.{BLOCKED}downloading.com/sa/receive_data.php
  • http://download.{BLOCKED}downloading.com/binaries/bin.php?id=0&up=1&fd=1
  • http://download.{BLOCKED}downloading.com/cn/cnconfig.php?vs=&country=&did=&grp=1591&pid=
  • http://download.{BLOCKED}downloading.com/binaries/check.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
    • Speed-Downloading
  • In HKEY_CURRENT_USER\Software
    • Speed-Downloading
  • In HKEY_CURRENT_USER\Software
    • fcn
  • In HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Uninstall
    • qlojmgjt
  • In HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Uninstall
    • iexsoqmg

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
    • qlojmgjt = "%Application Data%\qlojmgjt.exe qlojmgjt"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • iexsoqmg = "%Application Data%\iexsoqmg.exe iexsoqmg"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Speed-Downloading
    • dl_lg = "3Dde"
  • In HKEY_CURRENT_USER\Software\Speed-Downloading
    • dl_lg = "3Dde"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Speed-Downloading
    • grpid = "1591"
  • In HKEY_CURRENT_USER\Software\Speed-Downloading
    • grpid = "1591"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Speed-Downloading
    • installdt = "20100223"
  • In HKEY_CURRENT_USER\Software\Speed-Downloading
    • installdt = "20100223"
  • In HKEY_CURRENT_USER\Software\Speed-Downloading
    • uai = "http://www.{BLOCKED}downloading.com/congratulation.php?lg=3Dde&grpid=1591"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Speed-Downloading
    • dl_browser = "IE"
  • In HKEY_CURRENT_USER\Software\Speed-Downloading
    • dl_browser = "IE"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Speed-Downloading
    • dl_hp_url = "http://www.{BLOCKED}lsucher.com/?t=Q100223&s=h"
  • In HKEY_CURRENT_USER\Software\Speed-Downloading
    • dl_hp_url = "http://www.{BLOCKED}lsucher.com/?t=Q100223&s=h"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Speed-Downloading
    • dl_se_name = "Schnell Sucher"
  • In HKEY_CURRENT_USER\Software\Speed-Downloading
    • dl_se_name = "Schnell Sucher"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Speed-Downloading
    • dl_se_url = "http://www.{BLOCKED}lsucher.com/result.php?t=Q100223&s=b&keywords={searchTerms}"
  • In HKEY_CURRENT_USER\Software\Speed-Downloading
    • dl_se_url = "http://www.{BLOCKED}lsucher.com/result.php?t=Q100223&s=b&keywords={searchTerms}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Speed-Downloading
    • dl_se_icon = "http://www.{BLOCKED}lsucher.com/favicon.ico"
  • In HKEY_CURRENT_USER\Software\Speed-Downloading
    • dl_se_icon = "http://www.{BLOCKED}lsucher.com/favicon.ico"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Speed-Downloading
    • ss_res = "http://download.{BLOCKED}downloading.com/ss.php?lg=3Dde&grpid=1591"
  • In HKEY_CURRENT_USER\Software\Speed-Downloading
    • ss_res = "http://download.{BLOCKED}downloading.com/ss.php?lg=3Dde&grpid=1591"
  • In HKEY_CURRENT_USER\Software\Speed-Downloading
    • _status = "ok"
  • In HKEY_CURRENT_USER\Software\Speed-Downloading
    • uai = "http://www.{BLOCKED}downloading.com/congratulation.php?lg=3Dde&grpid=1591&itype=1&res=1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Speed-Downloading
    • sp_id = "1"
  • In HKEY_CURRENT_USER\Software\Speed-Downloading
    • ss_res = "http://download.{BLOCKED}downloading.com/ss.php?lg=3Dde&grpid=1591&res=2"
  • In HKEY_CURRENT_USER\Software\fcn
    • gid = "1591"
  • In HKEY_CURRENT_USER\Software\fcn
    • cnid = "DScHlhcxRj23tbAtutHsCg"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\qlojmgjt
    • DisplayName = "Favorit"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\qlojmgjt
    • UninstallString = "%Application Data%\qlojmgjt.exe -uninstall"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\qlojmgjt
    • NoRemove = "0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\qlojmgjt
    • NoModify = "1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\qlojmgjt
    • NoRepair = "1"
  • In HKEY_CURRENT_USER\Software\fcn
    • idt = "201209200504"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\iexsoqmg
    • DisplayName = "Favorit"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\iexsoqmg
    • UninstallString = "%Application Data%\iexsoqmg.exe -uninstall"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\iexsoqmg
    • NoRemove = "0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\iexsoqmg
    • NoModify = "1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\iexsoqmg
    • NoRepair = "1"

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\Microsoft\DirectDraw\MostRecentApplication
    • From: Name = "iexplore.exe"
      To: Name = ""iexplore.exe""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\DirectDraw\MostRecentApplication
    • From: ID = "4117b81"
      To: ID = ""41107b81""

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.
  • %User Temp%\nsh2.tmp
  • %User Temp%\nsi3.tmp\modern-header.bmp
  • %User Temp%\nsi3.tmp\modern-wizard.bmp
  • %User Temp%\nsi3.tmp\nsDialogs.dll
  • %User Temp%\nsi3.tmp\System.dll
  • %User Temp%\nsi3.tmp\SD_header.bmp
  • %User Temp%\nsi3.tmp\FavoritDE.rtf
  • %User Temp%\nsi3.tmp\FavoritEN.rtf
  • %User Temp%\nsi3.tmp\FavoritES.rtf
  • %User Temp%\nsi3.tmp\FavoritFR.rtf
  • %User Temp%\nsi3.tmp\FavoritIT.rtf
  • %Application Data%\qlojmgjt.exe
  • %User Temp%\nsi3.tmp\inetc.dll
  • %User Temp%\SD_setup_dat
  • %User Temp%\nsi3.tmp\ExtractDLL.dll
  • %User Temp%\Speed-Downloading_setup.exe
  • %User Temp%\nsi3.tmp\searchsolverlogo_FR.bmp
  • %User Temp%\nsi3.tmp\searchsolverlogo_EN.bmp
  • %User Temp%\nsi3.tmp\searchsolverlogo_DE.bmp
  • %User Temp%\nsi3.tmp\searchsolverlogo_ES.bmp
  • %User Temp%\nsi3.tmp\searchsolverlogo_IT.bmp
  • %User Temp%\nsi3.tmp\NSISdl.dll
  • 65826
  • %Application Data%\qlojmgjt.dat
  • %Application Data%\qlojmgjt_navps.dat
  • %Application Data%\qlojmgjt_m2s.xml
  • %Application Data%\qlojmgjt_m2s.zl
  • %Application Data%\qlojmgjt_s2m.zl
  • %Application Data%\qlojmgjt_s2m.xml
  • %Application Data%\iexsoqmg.exe
  • %Application Data%\qlojmgjt_navup.dat
  • %Application Data%\iexsoqmg.dat
  • %Application Data%\iexsoqmg_navps.dat
  • %Application Data%\iexsoqmg_nav.dat
  • %Application Data%\iexsoqmg_navup.dat

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.
  • %System Root%\DOCUME~1
  • %System Root%\DOCUME~1\Wilbert
  • %User Profile%\LOCALS~1
  • %User Temp%\nsi3.tmp

Step 8

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

  • %User Temp%\nsh1.tmp
  • %User Temp%\nsi3.tmp
  • %Application Data%\qlojmgjt_navtmp.dat

Step 10

Restore these deleted registry keys/values from backup

*Note: Only Microsoft-related keys/values will be restored. If the malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.

  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall
    • qlojmgjt


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