TROJ_LIPLER.SMI
TrojanDownloader:Win32/Wintrim.BX (Microsoft); Downloader-BPJ (McAfee); Downloader (Symantec); Trojan-Downloader.Win32.Lipler.iml (Kaspersky); Trojan-Downloader.Win32.Wintrim.bxa (v) (Sunbelt); Adware:W32/Wintrim.gen!P (FSecure)
Windows 2000, Windows XP, Windows Server 2003
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
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%\nsb3.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:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.. %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, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)
Other System Modifications
This Trojan deletes the following files:
- %User Temp%\nsw1.tmp
- %User Temp%\nsb3.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, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)
It adds the following registry keys:
HKEY_LOCAL_MACHINE\Software\Speed-Downloading
HKEY_CURRENT_USER\Software\Speed-Downloading
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\SearchScopes\{random key}
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Speed-Downloading
dl_lg = "de"
HKEY_CURRENT_USER\Software\Speed-Downloading
dl_lg = "de"
HKEY_LOCAL_MACHINE\SOFTWARE\Speed-Downloading
grpid = "1865"
HKEY_CURRENT_USER\Software\Speed-Downloading
grpid = "1865"
HKEY_LOCAL_MACHINE\SOFTWARE\Speed-Downloading
installdt = "20090806"
HKEY_CURRENT_USER\Software\Speed-Downloading
installdt = "20090806"
HKEY_CURRENT_USER\Software\Speed-Downloading
uai = "http://www.{BLOCKED}downloading.com/congratulation.php?lg=de&grpid=1865&tag_id=635"
HKEY_LOCAL_MACHINE\SOFTWARE\Speed-Downloading
dl_browser = "FF"
HKEY_CURRENT_USER\Software\Speed-Downloading
dl_browser = "FF"
HKEY_LOCAL_MACHINE\SOFTWARE\Speed-Downloading
dl_hp_url = "http://www.{BLOCKED}lsucher.com/?t=Q0908061865&s=h"
HKEY_CURRENT_USER\Software\Speed-Downloading
dl_hp_url = "http://www.{BLOCKED}lsucher.com/?t=Q0908061865&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/?t=Q0908061865&s=b&keywords={searchTerms}"
HKEY_CURRENT_USER\Software\Speed-Downloading
dl_se_url = "http://www.{BLOCKED}lsucher.com/?t=Q0908061865&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_CURRENT_USER\Software\Speed-Downloading
_status = "ok"
HKEY_CURRENT_USER\Software\Speed-Downloading
uai = "{random characters}"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\SearchScopes\{random key}
URL = "http://www.{BLOCKED}lsucher.com/?t=Q0908061865&s=b&keywords={searchTerms}"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\SearchScopes\{random key}
DisplayName = "Schnell Sucher"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\SearchScopes\{random key}
FaviconPath = "{random characters}"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\SearchScopes
DefaultScope = "{0F36E18A-6296-4333-9D99-269AAFE3D111}_Schnell Sucher"
HKEY_LOCAL_MACHINE\SOFTWARE\Speed-Downloading
sp_id = "1"
It modifies the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main
Start Page = "http://www.{BLOCKED}lsucher.com/?t=Q0908061865&s=h"
(Note: The default value data of the said registry entry is http://www.microsoft.com/isapi/redir.dll?prd=ie&pver=6&ar=msnhome.)
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.)
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
SystemCertificates\CA\Certificates\
FE622EA7B33CA46519AB39736A66B8F6E41FF157
Blob = "{random values}"
(Note: The default value data of the said registry entry is {random values}.)
Dropping Routine
This Trojan drops the following files:
- %User Temp%\nsw2.tmp
- %User Temp%\nsb3.tmp\modern-header.bmp
- %User Temp%\nsb3.tmp\modern-wizard.bmp
- %User Temp%\nsb3.tmp\nsDialogs.dll
- %User Temp%\nsb3.tmp\System.dll
- %User Temp%\nsb3.tmp\SD_header.bmp
- %User Temp%\nsb3.tmp\FavoritDE.rtf
- %User Temp%\nsb3.tmp\FavoritEN.rtf
- %User Temp%\nsb3.tmp\FavoritES.rtf
- %User Temp%\nsb3.tmp\FavoritFR.rtf
- %User Temp%\nsb3.tmp\FavoritIT.rtf
- %User Temp%\nsb3.tmp\FindProcDLL.dll
- %Application Data%\Microsoft\Internet Explorer\Services\search_{0F36E18A-6296-4333-9D99-269AAFE3D111}_Schnell Sucher.ico
- %User Temp%\nsb3.tmp\inetc.dll
- %User Temp%\SD_setup_dat
- %User Temp%\nsb3.tmp\ExtractDLL.dll
- %User Temp%\Speed-Downloading_setup.exe
(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, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.. %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.)
Other Details
This Trojan connects to the following possibly malicious URL:
- http://download.{BLOCKED}t-network.com/binaries/download.php
- http://www.{BLOCKED}downloading.com/nilog.php?{random characters}
- http://www.{BLOCKED}lsucher.com/favicon.ico
- http://download.{BLOCKED}downloading.com/Speed-Downloading_download.php?file=SD_setup_dat
This report is generated via an automated analysis system.
SOLUTION
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
Delete this registry key
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\Microsoft\Internet Explorer\SearchScopes
- {random key}
Step 3
Delete this registry value
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
- dl_lg = "de"
- In HKEY_CURRENT_USER\Software\Speed-Downloading
- dl_lg = "de"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Speed-Downloading
- grpid = "1865"
- In HKEY_CURRENT_USER\Software\Speed-Downloading
- grpid = "1865"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Speed-Downloading
- installdt = "20090806"
- In HKEY_CURRENT_USER\Software\Speed-Downloading
- installdt = "20090806"
- In HKEY_CURRENT_USER\Software\Speed-Downloading
- uai = "http://www.{BLOCKED}downloading.com/congratulation.php?lg=de&grpid=1865&tag_id=635"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Speed-Downloading
- dl_browser = "FF"
- In HKEY_CURRENT_USER\Software\Speed-Downloading
- dl_browser = "FF"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Speed-Downloading
- dl_hp_url = "http://www.{BLOCKED}lsucher.com/?t=Q0908061865&s=h"
- In HKEY_CURRENT_USER\Software\Speed-Downloading
- dl_hp_url = "http://www.{BLOCKED}lsucher.com/?t=Q0908061865&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/?t=Q0908061865&s=b&keywords={searchTerms}"
- In HKEY_CURRENT_USER\Software\Speed-Downloading
- dl_se_url = "http://www.{BLOCKED}lsucher.com/?t=Q0908061865&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_CURRENT_USER\Software\Speed-Downloading
- _status = "ok"
- In HKEY_CURRENT_USER\Software\Speed-Downloading
- uai = "{random characters}"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\SearchScopes\{random key}
- URL = "http://www.{BLOCKED}lsucher.com/?t=Q0908061865&s=b&keywords={searchTerms}"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\SearchScopes\{random key}
- DisplayName = "Schnell Sucher"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\SearchScopes\{random key}
- FaviconPath = "{random characters}"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\SearchScopes
- DefaultScope = "{0F36E18A-6296-4333-9D99-269AAFE3D111}_Schnell Sucher"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Speed-Downloading
- sp_id = "1"
Step 4
Restore these modified registry values
Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out this Microsoft article first before modifying your computer's registry.
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main
- From: Start Page = "http://www.{BLOCKED}lsucher.com/?t=Q0908061865&s=h"
To: Start Page = ""http://www.microsoft.com/isapi/redir.dll?prd=ie&pver=6&ar=msnhome""
- From: Start Page = "http://www.{BLOCKED}lsucher.com/?t=Q0908061865&s=h"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\DirectDraw\MostRecentApplication
- From: Name = "iexplore.exe"
To: Name = ""iexplore.exe""
- From: Name = "iexplore.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\DirectDraw\MostRecentApplication
- From: ID = "4117b81"
To: ID = ""41107b81""
- From: ID = "4117b81"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\SystemCertificates\CA\Certificates\FE622EA7B33CA46519AB39736A66B8F6E41FF157
- From: Blob = "{random values}"
To: Blob = ""{random values}""
- From: Blob = "{random values}"
Step 5
Search and delete these components
- %User Temp%\nsw2.tmp
- %User Temp%\nsb3.tmp\modern-header.bmp
- %User Temp%\nsb3.tmp\modern-wizard.bmp
- %User Temp%\nsb3.tmp\nsDialogs.dll
- %User Temp%\nsb3.tmp\System.dll
- %User Temp%\nsb3.tmp\SD_header.bmp
- %User Temp%\nsb3.tmp\FavoritDE.rtf
- %User Temp%\nsb3.tmp\FavoritEN.rtf
- %User Temp%\nsb3.tmp\FavoritES.rtf
- %User Temp%\nsb3.tmp\FavoritFR.rtf
- %User Temp%\nsb3.tmp\FavoritIT.rtf
- %User Temp%\nsb3.tmp\FindProcDLL.dll
- %Application Data%\Microsoft\Internet Explorer\Services\search_{0F36E18A-6296-4333-9D99-269AAFE3D111}_Schnell Sucher.ico
- %User Temp%\nsb3.tmp\inetc.dll
- %User Temp%\SD_setup_dat
- %User Temp%\nsb3.tmp\ExtractDLL.dll
- %User Temp%\Speed-Downloading_setup.exe
Step 6
Search and delete these folders
- %System Root%\DOCUME~1
- %System Root%\DOCUME~1\ADMINI~1
- %User Profile%\LOCALS~1
- %User Temp%\nsb3.tmp
Step 7
Scan your computer with your Trend Micro product to delete files detected as TROJ_LIPLER.SMI. 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%\nsb3.tmp
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