TROJ_FAM_00000a400.TOMA
TrojanDownloader:Win32/Wintrim.BX (Microsoft); Skintrim.gen.c (McAfee); Trojan.Gen (Symantec); Trojan-Dropper.Win32.Kamboda.gwg (Kaspersky); Trojan-Downloader.Win32.Agent (Sunbelt); Trojan.Generic.1936552 (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
656,005 bytes
EXE
Yes
29 Nov 2011
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%\nsi3.tmp
- %Program Files%\Live-Player
- %Program Files%\Live-Player\data
- %Program Files%\Live-Player\skins
- %System Root%\Documents and Settings
- %System Root%\Documents and Settings\Administrator
- %User Profile%\Local Settings
- %Application Data%\live-player
- %System Root%\Documents and Settings\All Users
- %Start Menu%\Programs
- %Start Menu%\Programs\Live-Player
- %Windows%\SoftwareDistribution
- %Windows%\SoftwareDistribution\DataStore\Logs\
- %Windows%\SoftwareDistribution\DataStore
(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.. %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.. %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)
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
dctribq = ""%Application Data%\dctribq.exe" dctribq"
Other System Modifications
This Trojan deletes the following files:
- %User Temp%\nss1.tmp
- %User Temp%\nsi3.tmp
- %Windows%\SoftwareDistribution\DataStore\Logs\edbtmp.log
(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.. %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)
It deletes the following folders:
- %User Temp%\nsi3.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_CURRENT_USER\Software\OOO\
Live-Player
HKEY_LOCAL_MACHINE\Software\OOO\
Live-Player
HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
Live-Player
HKEY_CURRENT_USER\Software\fcn
HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
dctribq
HKEY_CURRENT_USER\Software\LanConfig
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\OOO\
Live-Player
grpid = "579"
HKEY_CURRENT_USER\Software\OOO\
Live-Player
grpid = "579"
HKEY_LOCAL_MACHINE\SOFTWARE\OOO\
Live-Player
InstallOpt1 = "1"
HKEY_CURRENT_USER\Software\OOO\
Live-Player
InstallOpt1 = "1"
HKEY_LOCAL_MACHINE\SOFTWARE\OOO\
Live-Player
installdt = "20081121"
HKEY_CURRENT_USER\Software\OOO\
Live-Player
installdt = "20081121"
HKEY_CURRENT_USER\Software\OOO\
Live-Player
uai = "http://www.{BLOCKED}layer.com/congratulation.php?lg=es&grpid=579&installopt1=1&tag_id=378"
HKEY_LOCAL_MACHINE\SOFTWARE\OOO\
Live-Player
dl_lg = "es"
HKEY_CURRENT_USER\Software\OOO\
Live-Player
dl_lg = "es"
HKEY_CURRENT_USER\Software\OOO\
Live-Player
uai = "http://www.{BLOCKED}layer.com/congratulation.php?lg=es&grpid=579&installopt1=1&tag_id=378&res=1"
HKEY_LOCAL_MACHINE\SOFTWARE\OOO\
Live-Player
Language = "en"
HKEY_CURRENT_USER\Software\OOO\
Live-Player
Language = "en"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Live-Player
DisplayName = "Live-Player"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Live-Player
UninstallString = "%Program Files%\Live-Player\uninst.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Live-Player
UninstallString2 = ""%Program Files%\Live-Player\uninst.exe" /S"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Live-Player
DisplayIcon = "%Program Files%\Live-Player\Live-Player.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Live-Player
DisplayVersion = "1.0"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Live-Player
URLInfoAbout = "http://www.Live-player.com"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Live-Player
Publisher = "OOO «Favorit»"
HKEY_LOCAL_MACHINE\SOFTWARE\OOO\
Live-Player
Installer Language = "1033"
HKEY_CURRENT_USER\Software\fcn
gid = "579"
HKEY_CURRENT_USER\Software\fcn
cnid = "Z5cAvjgNSiSwxUZzDEM0vg"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
dctribq
DisplayName = "Favorit"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
dctribq
UninstallString = ""%Application Data%\dctribq.exe" -uninstall"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
dctribq
NoModify = 1
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
dctribq
NoRepair = 1
HKEY_CURRENT_USER\Software\fcn
idt = "201111230502"
HKEY_CURRENT_USER\Software\LanConfig
LAN = "UP"
It modifies the following registry entries:
HKEY_CURRENT_USER\SessionInformation
ProgramCount = 2
(Note: The default value data of the said registry entry is 1.)
HKEY_CURRENT_USER\SessionInformation
ProgramCount = 1
(Note: The default value data of the said registry entry is 1.)
Dropping Routine
This Trojan drops the following files:
- %User Temp%\nss2.tmp
- %User Temp%\nsi3.tmp\LangDLL.dll
- %User Temp%\nsi3.tmp\ioSpecial.ini
- %User Temp%\nsi3.tmp\modern-wizard.bmp
- %User Temp%\nsi3.tmp\modern-header.bmp
- %User Temp%\nsi3.tmp\InstallOptions.dll
- %Application Data%\dctribq.exe
- %Program Files%\Live-Player\data\translation_file_live-player.xml
- %Application Data%\live-player\flv.swf
- %Start Menu%\Programs\Live-Player\Live-Player.lnk
- %Start Menu%\Programs\Live-Player\Uninstall.lnk
- %Desktop%\Live-Player.lnk
- %User Temp%\nsi3.tmp\NSISdl.dll
- %User Temp%\db.dat
- %User Temp%\skin_dll.dat
- %User Temp%\sqlite_dll.dat
- %User Temp%\liveplayer_exe.dat
- %User Temp%\liveplayer_skin.dat
- %User Temp%\vcredist_x86.exe
- %User Temp%\nsi3.tmp\ExtractDLL.dll
- %Program Files%\Live-Player\live-player.exe
- %Program Files%\Live-Player\sqlite3.dll
- %Program Files%\Live-Player\SkinCrafterDll.dll
- %Program Files%\Live-Player\skins\live-player.skf
- %Application Data%\live-player\liveplayer.s3db
- %Program Files%\Live-Player\uninst.exe
- %Application Data%\dctribq.dat
- %User Temp%\dctribqpi.tmp
- %Application Data%\dctribq_m2s.xml
- %Application Data%\dctribq_m2s.zl
- %Application Data%\dctribq_s2m.zl
- %Application Data%\dctribq_s2m.xml
- %User Temp%\dctribqup.tmp
- %User Temp%\dctribqpic.tmp
- %Application Data%\dctribq_navps.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://updates.{BLOCKED}-network.comsa/cpi.php?{random characters}
- http://updates.{BLOCKED}-network.comsa/receive_data.php?tcpc=40078
- http://updates.{BLOCKED}-network.combinaries/bin.php?id=0&up=1&fd=1&tcpc=40312
- http://updates.{BLOCKED}-network.combinaries/check.php?tcpc=41937
- http://updates.{BLOCKED}-network.combinaries/check.php?tcpc=55750
- http://updates.{BLOCKED}-network.combinaries/check.php?tcpc=69625
This report is generated via an automated analysis system.
SOLUTION
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
Step 3
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_CURRENT_USER\Software\OOO
- Live-Player
- In HKEY_LOCAL_MACHINE\Software\OOO
- Live-Player
- In HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Uninstall
- Live-Player
- In HKEY_CURRENT_USER\Software
- fcn
- In HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Uninstall
- dctribq
- In HKEY_CURRENT_USER\Software
- LanConfig
Step 4
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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- dctribq=""%Application Data%\dctribq.exe" dctribq"
- In HKEY_LOCAL_MACHINE\SOFTWARE\OOO\Live-Player
- grpid="579"
- In HKEY_CURRENT_USER\Software\OOO\Live-Player
- grpid="579"
- In HKEY_LOCAL_MACHINE\SOFTWARE\OOO\Live-Player
- InstallOpt1="1"
- In HKEY_CURRENT_USER\Software\OOO\Live-Player
- InstallOpt1="1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\OOO\Live-Player
- installdt="20081121"
- In HKEY_CURRENT_USER\Software\OOO\Live-Player
- installdt="20081121"
- In HKEY_CURRENT_USER\Software\OOO\Live-Player
- uai="http://www.{BLOCKED}layer.com/congratulation.php?lg=es&grpid=579&installopt1=1&tag_id=378"
- In HKEY_LOCAL_MACHINE\SOFTWARE\OOO\Live-Player
- dl_lg="es"
- In HKEY_CURRENT_USER\Software\OOO\Live-Player
- dl_lg="es"
- In HKEY_CURRENT_USER\Software\OOO\Live-Player
- uai="http://www.{BLOCKED}layer.com/congratulation.php?lg=es&grpid=579&installopt1=1&tag_id=378&res=1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\OOO\Live-Player
- Language="en"
- In HKEY_CURRENT_USER\Software\OOO\Live-Player
- Language="en"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Live-Player
- DisplayName="Live-Player"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Live-Player
- UninstallString="%Program Files%\Live-Player\uninst.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Live-Player
- UninstallString2=""%Program Files%\Live-Player\uninst.exe" /S"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Live-Player
- DisplayIcon="%Program Files%\Live-Player\Live-Player.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Live-Player
- DisplayVersion="1.0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Live-Player
- URLInfoAbout="http://www.Live-player.com"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Live-Player
- Publisher="OOO «Favorit»"
- In HKEY_LOCAL_MACHINE\SOFTWARE\OOO\Live-Player
- Installer Language="1033"
- In HKEY_CURRENT_USER\Software\fcn
- gid="579"
- In HKEY_CURRENT_USER\Software\fcn
- cnid="Z5cAvjgNSiSwxUZzDEM0vg"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\dctribq
- DisplayName="Favorit"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\dctribq
- UninstallString=""%Application Data%\dctribq.exe" -uninstall"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\dctribq
- NoModify=1
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\dctribq
- NoRepair=1
- In HKEY_CURRENT_USER\Software\fcn
- idt="201111230502"
- In HKEY_CURRENT_USER\Software\LanConfig
- LAN="UP"
Step 5
Restore this modified 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_CURRENT_USER\SessionInformation
- From: ProgramCount=2
To: ProgramCount=1
- From: ProgramCount=2
- In HKEY_CURRENT_USER\SessionInformation
- From: ProgramCount=1
To: ProgramCount=1
- From: ProgramCount=1
Step 6
Search and delete these folders
- %System Root%\DOCUME~1
- %System Root%\DOCUME~1\ADMINI~1
- %User Profile%\LOCALS~1
- %User Temp%\nsi3.tmp
- %Program Files%\Live-Player
- %Program Files%\Live-Player\data
- %Program Files%\Live-Player\skins
- %System Root%\Documents and Settings
- %System Root%\Documents and Settings\Administrator
- %User Profile%\Local Settings
- %Application Data%\live-player
- %System Root%\Documents and Settings\All Users
- %Start Menu%\Programs
- %Start Menu%\Programs\Live-Player
- %Windows%\SoftwareDistribution
- %Windows%\SoftwareDistribution\DataStore\Logs\
- %Windows%\SoftwareDistribution\DataStore
Step 7
Search and delete these files
- %User Temp%\nss2.tmp
- %User Temp%\nsi3.tmp\LangDLL.dll
- %User Temp%\nsi3.tmp\ioSpecial.ini
- %User Temp%\nsi3.tmp\modern-wizard.bmp
- %User Temp%\nsi3.tmp\modern-header.bmp
- %User Temp%\nsi3.tmp\InstallOptions.dll
- %Application Data%\dctribq.exe
- %Program Files%\Live-Player\data\translation_file_live-player.xml
- %Application Data%\live-player\flv.swf
- %Start Menu%\Programs\Live-Player\Live-Player.lnk
- %Start Menu%\Programs\Live-Player\Uninstall.lnk
- %Desktop%\Live-Player.lnk
- %User Temp%\nsi3.tmp\NSISdl.dll
- %User Temp%\db.dat
- %User Temp%\skin_dll.dat
- %User Temp%\sqlite_dll.dat
- %User Temp%\liveplayer_exe.dat
- %User Temp%\liveplayer_skin.dat
- %User Temp%\vcredist_x86.exe
- %User Temp%\nsi3.tmp\ExtractDLL.dll
- %Program Files%\Live-Player\live-player.exe
- %Program Files%\Live-Player\sqlite3.dll
- %Program Files%\Live-Player\SkinCrafterDll.dll
- %Program Files%\Live-Player\skins\live-player.skf
- %Application Data%\live-player\liveplayer.s3db
- %Program Files%\Live-Player\uninst.exe
- %Application Data%\dctribq.dat
- %User Temp%\dctribqpi.tmp
- %Application Data%\dctribq_m2s.xml
- %Application Data%\dctribq_m2s.zl
- %Application Data%\dctribq_s2m.zl
- %Application Data%\dctribq_s2m.xml
- %User Temp%\dctribqup.tmp
- %User Temp%\dctribqpic.tmp
- %Application Data%\dctribq_navps.dat
Step 8
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_FAM_00000a400.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 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%\nss1.tmp
- %User Temp%\nsi3.tmp
- %Windows%\SoftwareDistribution\DataStore\Logs\edbtmp.log
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