TROJ_LIPLER.AO

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.

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%\nsq3.tmp
• %Program Files%\PCOptimizer
• %Start Menu%\Programs\PC-Optimizer

(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
thcjgsf = "%Application Data%\thcjgsf.exe thcjgsf"

Other System Modifications

This Trojan deletes the following files:

• %User Temp%\nsk1.tmp
• %User Temp%\nsq3.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\PCOptimizer

HKEY_CURRENT_USER\Software\PCOptimizer

HKEY_CURRENT_USER\Software\fcn

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
thcjgsf

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\PCOptimizer
dl_lg = "fr"

HKEY_CURRENT_USER\Software\PCOptimizer
dl_lg = "fr"

HKEY_LOCAL_MACHINE\SOFTWARE\PCOptimizer
grpid = "3068"

HKEY_CURRENT_USER\Software\PCOptimizer
grpid = "3068"

HKEY_LOCAL_MACHINE\SOFTWARE\PCOptimizer
installdt = "20090904"

HKEY_CURRENT_USER\Software\PCOptimizer
installdt = "20090904"

HKEY_CURRENT_USER\Software\PCOptimizer
uai = "http://www.{BLOCKED}imizer.com/congratulation.php?lg=fr&grpid=3068&tag_id=851"

HKEY_LOCAL_MACHINE\SOFTWARE\PCOptimizer
dl_browser = "IE"

HKEY_CURRENT_USER\Software\PCOptimizer
dl_browser = "IE"

HKEY_LOCAL_MACHINE\SOFTWARE\PCOptimizer
dl_hp_url = "http://www.{BLOCKED}lsucher.com/?t=Q0909043068&s=h"

HKEY_CURRENT_USER\Software\PCOptimizer
dl_hp_url = "http://www.{BLOCKED}lsucher.com/?t=Q0909043068&s=h"

HKEY_LOCAL_MACHINE\SOFTWARE\PCOptimizer
dl_se_name = "Schnell Sucher"

HKEY_CURRENT_USER\Software\PCOptimizer
dl_se_name = "Schnell Sucher"

HKEY_LOCAL_MACHINE\SOFTWARE\PCOptimizer
dl_se_url = "http://www.{BLOCKED}lsucher.com/?t=Q0909043068&s=b&keywords={searchTerms}"

HKEY_CURRENT_USER\Software\PCOptimizer
dl_se_url = "http://www.{BLOCKED}lsucher.com/?t=Q0909043068&s=b&keywords={searchTerms}"

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

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

HKEY_CURRENT_USER\Software\PCOptimizer
_status = "ok"

HKEY_CURRENT_USER\Software\PCOptimizer
uai = "{random characters}"

HKEY_LOCAL_MACHINE\SOFTWARE\PCOptimizer
sp_id = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\PCOptimizer
ApplicationVersionInstall = "1001"

HKEY_CURRENT_USER\Software\PCOptimizer
ApplicationVersionInstall = "1001"

HKEY_LOCAL_MACHINE\SOFTWARE\PCOptimizer
dl_lg = "FR"

HKEY_LOCAL_MACHINE\SOFTWARE\PCOptimizer
Language = "FR"

HKEY_CURRENT_USER\Software\PCOptimizer
dl_lg = "FR"

HKEY_CURRENT_USER\Software\PCOptimizer
Language = "FR"

HKEY_CURRENT_USER\Software\fcn
gid = "3068"

HKEY_CURRENT_USER\Software\fcn
cnid = "qh6yP-uoSFGV-tQANzqEwg"

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

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

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

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

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

HKEY_CURRENT_USER\Software\fcn
idt = "201209211718"

Dropping Routine

This Trojan drops the following files:

• %User Temp%\nsk2.tmp
• %User Temp%\nsq3.tmp\modern-header.bmp
• %User Temp%\nsq3.tmp\modern-wizard.bmp
• %User Temp%\nsq3.tmp\nsDialogs.dll
• %User Temp%\nsq3.tmp\System.dll
• %User Temp%\nsq3.tmp\header_PCO.bmp
• %User Temp%\nsq3.tmp\FavoritDE.rtf
• %User Temp%\nsq3.tmp\FavoritEN.rtf
• %User Temp%\nsq3.tmp\FavoritES.rtf
• %User Temp%\nsq3.tmp\FavoritFR.rtf
• %User Temp%\nsq3.tmp\FavoritIT.rtf
• %Application Data%\thcjgsf.exe
• %Start Menu%\Programs\PC-Optimizer\PC-Optimizer.lnk
• %Start Menu%\Programs\PC-Optimizer\Désinstaller.lnk
• %Desktop%\PC-Optimizer.lnk
• %User Temp%\nsq3.tmp\NSISdl.dll
• %User Temp%\PCOptimizer_exe.dat
• %Application Data%\thcjgsf.dat
• %Application Data%\thcjgsf_navps.dat
• %Application Data%\thcjgsf_m2s.xml
• %Application Data%\thcjgsf_m2s.zl
• %Application Data%\thcjgsf_s2m.zl
• %Application Data%\thcjgsf_s2m.xml

(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.. %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
• http://updates.{BLOCKED}-network.com/sa/cpi.php?{random characters}
• http://updates.{BLOCKED}-network.com/sa/receive_data.php
• http://updates.{BLOCKED}-network.com/binaries/bin.php?id=0&up=1&fd=1

This report is generated via an automated analysis system.