WORM_TDSS.SMH
Trojan:Win32/Alureon.gen!J (Microsoft); DNSChanger.gen (McAfee); Trojan.Zlob (Symantec); ARC:NSIS, [jah340912.exe]:Packed.Win32.TDSS.c (Kaspersky); Trojan.Win32.Generic.pak!cobra (Sunbelt); Trojan.TDss.AQ (FSecure)
Windows 2000, Windows XP, Windows Server 2003
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Worm
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This worm 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
82,585 bytes
EXE
No
03 Oct 2012
Arrival Details
This worm 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 worm creates the following folders:
- %System Root%\DOCUME~1
- %System Root%\DOCUME~1\ADMINI~1
- %User Profile%\LOCALS~1
- %User Temp%\nsd2.tmp
- %Program Files%\extravideo
- %System Root%\Documents and Settings\Administrator
- %Start Menu%\Programs\extravideo
- %System Root%\resycled
(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.. %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).. %Start Menu% is the current user's Start Menu folder, which is usually C:\Windows\Start Menu or C:\Documents and Settings\{User name}\Start Menu on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu on Windows Vista and 7.)
Other System Modifications
This worm deletes the following files:
- %User Temp%\nsc1.tmp
- %User Temp%\nsd2.tmp
- %User Temp%\tmp4.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_CURRENT_USER\Software\extravideo
HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
extravideo
HKEY_CURRENT_USER\Software\{NSINAME}
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
extravideo
UninstallString = "%Program Files%\extravideo\Uninstall.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
extravideo
InstallLocation = "%Program Files%\extravideo"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
extravideo
DisplayName = "extravideo"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
extravideo
DisplayIcon = "%Program Files%\extravideo\Uninstall.exe,0"
HKEY_CURRENT_USER\Software\{NSINAME}
Start Menu Folder = "extravideo"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Control\Print\Printers
SymbolicLinkValue = "{random characters}"
It modifies the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Control\Print\Providers
LogonTime = "{random values}"
(Note: The default value data of the said registry entry is {random values}.)
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Eventlog\System\
Print
TypesSupported = "7"
(Note: The default value data of the said registry entry is 7.)
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Eventlog\System\
TCPMon
TypesSupported = "7"
(Note: The default value data of the said registry entry is 7.)
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Eventlog\System\
TCPMon
EventMessageFile = "%SystemRoot%\System32\tcpmon.dll"
(Note: The default value data of the said registry entry is %SystemRoot%\System32\tcpmon.dll.)
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Control\Print
BeepEnabled = "0"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Print\
Printers
DefaultSpoolDirectory = "%System%\spool\PRINTERS"
(Note: The default value data of the said registry entry is %Windows%\System32\spool\PRINTERS.)
Dropping Routine
This worm drops the following files:
- %User Temp%\jah340912.exe
- %User Temp%\nsd2.tmp\modern-header.bmp
- %Program Files%\extravideo\Uninstall.exe
- %Start Menu%\Programs\extravideo\Uninstall.lnk
- %User Temp%\nsd2.tmp\StartMenu.dll
- %User Temp%\tmp3.tmp
- a:\autorun.inf
- %System Root%\autorun.inf
- d:\autorun.inf
- %System Root%\T
- %User Temp%\tmp4.tmp
- %System Root%\resycled\boot.com
This report is generated via an automated analysis system.
SOLUTION
9.200
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_CURRENT_USER\Software
- extravideo
- In HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Uninstall
- extravideo
- In HKEY_CURRENT_USER\Software
- {NSINAME}
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\Microsoft\Windows\CurrentVersion\Uninstall\extravideo
- UninstallString = "%Program Files%\extravideo\Uninstall.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\extravideo
- InstallLocation = "%Program Files%\extravideo"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\extravideo
- DisplayName = "extravideo"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\extravideo
- DisplayIcon = "%Program Files%\extravideo\Uninstall.exe,0"
- In HKEY_CURRENT_USER\Software\{NSINAME}
- Start Menu Folder = "extravideo"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Print\Printers
- SymbolicLinkValue = "{random characters}"
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_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Print\Providers
- From: LogonTime = "{random values}"
To: LogonTime = ""{random values}""
- From: LogonTime = "{random values}"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Eventlog\System\Print
- From: TypesSupported = "7"
To: TypesSupported = ""7""
- From: TypesSupported = "7"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Eventlog\System\TCPMon
- From: TypesSupported = "7"
To: TypesSupported = ""7""
- From: TypesSupported = "7"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Eventlog\System\TCPMon
- From: EventMessageFile = "%SystemRoot%\System32\tcpmon.dll"
To: EventMessageFile = ""%SystemRoot%\System32\tcpmon.dll""
- From: EventMessageFile = "%SystemRoot%\System32\tcpmon.dll"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Print
- BeepEnabled = "0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Print\Printers
- From: DefaultSpoolDirectory = "%System%\spool\PRINTERS"
To: DefaultSpoolDirectory = ""%Windows%\System32\spool\PRINTERS""
- From: DefaultSpoolDirectory = "%System%\spool\PRINTERS"
Step 5
Search and delete these components
- %User Temp%\jah340912.exe
- %User Temp%\nsd2.tmp\modern-header.bmp
- %Program Files%\extravideo\Uninstall.exe
- %Start Menu%\Programs\extravideo\Uninstall.lnk
- %User Temp%\nsd2.tmp\StartMenu.dll
- %User Temp%\tmp3.tmp
- a:\autorun.inf
- %System Root%\autorun.inf
- d:\autorun.inf
- %System Root%\T
- %User Temp%\tmp4.tmp
- %System Root%\resycled\boot.com
Step 6
Search and delete these folders
- %System Root%\DOCUME~1
- %System Root%\DOCUME~1\ADMINI~1
- %User Profile%\LOCALS~1
- %User Temp%\nsd2.tmp
- %Program Files%\extravideo
- %System Root%\Documents and Settings\Administrator
- %Start Menu%\Programs\extravideo
- %System Root%\resycled
Step 7
Scan your computer with your Trend Micro product to delete files detected as WORM_TDSS.SMH. 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%\nsc1.tmp
- %User Temp%\nsd2.tmp
- %User Temp%\tmp4.tmp
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