TROJ_STARTP.SMHQ
Trojan:Win32/Startpage.GW (Microsoft); Generic Dropper!che (McAfee); Trojan Horse (Symantec); Trojan-Dropper.Win32.Agent.blfz (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan horse Startpage.GKR.dropper (AVG)
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
299,008 bytes
EXE
No
09 May 2013
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.
Other System Modifications
This Trojan adds the following registry keys:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
HideDesktopIcons
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
HideDesktopIcons\ClassicStartMenu
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
HideDesktopIcons\NewStartPanel
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Desktop\NameSpace\{2BE11047-844A-45c8-BE9C-1740193DC628}
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{2BE11047-844A-45c8-BE9C-1740193DC628}
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{2BE11047-844A-45c8-BE9C-1740193DC628}\DefaultIcon
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{2BE11047-844A-45c8-BE9C-1740193DC628}\InProcServer32
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{2BE11047-844A-45c8-BE9C-1740193DC628}\ShellFolder
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{2BE11047-844A-45c8-BE9C-1740193DC628}\shell
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{2BE11047-844A-45c8-BE9C-1740193DC628}\shell\
OpenHomePage
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{2BE11047-844A-45c8-BE9C-1740193DC628}\shell\
OpenHomePage\Command
It adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
HideDesktopIcons\ClassicStartMenu
{871C5380-42A0-1069-A2EA-08002B30309D} = "1"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
HideDesktopIcons\NewStartPanel
{871C5380-42A0-1069-A2EA-08002B30309D} = "1"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{2BE11047-844A-45c8-BE9C-1740193DC628}
InfoTip = "@shdoclc.dll,-881"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{2BE11047-844A-45c8-BE9C-1740193DC628}
LocalizedString = "@shdoclc.dll,-880"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{2BE11047-844A-45c8-BE9C-1740193DC628}\InProcServer32
ThreadingModel = "Apartment"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{2BE11047-844A-45c8-BE9C-1740193DC628}\ShellFolder
Attributes = "0"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{2BE11047-844A-45c8-BE9C-1740193DC628}\shell\
OpenHomePage
MUIVerb = "@shdoclc.dll,-10241"
It modifies the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Windows NT\CurrentVersion\Windows
Load = "%User Profile%\APPLIC~1\dxsetup.exe"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main
Start Page = "http://www.{BLOCKED}4.cc"
(Note: The default value data of the said registry entry is http://www.microsoft.com/isapi/redir.dll?prd=ie&pver=6&ar=msnhome.)
Dropping Routine
This Trojan drops the following files:
- %User Profile%\Application Data\dxsetup.exe
- %User Profile%\Application Data\config.cmd
- %User Profile%\Application Data\backup.reg
(Note: %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.)
This report is generated via an automated analysis system.
SOLUTION
9.300
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\Microsoft\Windows\CurrentVersion\Explorer
- HideDesktopIcons
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\HideDesktopIcons
- ClassicStartMenu
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\HideDesktopIcons
- NewStartPanel
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Desktop\NameSpace
- {2BE11047-844A-45c8-BE9C-1740193DC628}
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID
- {2BE11047-844A-45c8-BE9C-1740193DC628}
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{2BE11047-844A-45c8-BE9C-1740193DC628}
- DefaultIcon
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{2BE11047-844A-45c8-BE9C-1740193DC628}
- InProcServer32
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{2BE11047-844A-45c8-BE9C-1740193DC628}
- ShellFolder
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{2BE11047-844A-45c8-BE9C-1740193DC628}
- shell
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{2BE11047-844A-45c8-BE9C-1740193DC628}\shell
- OpenHomePage
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{2BE11047-844A-45c8-BE9C-1740193DC628}\shell\OpenHomePage
- Command
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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\HideDesktopIcons\ClassicStartMenu
- {871C5380-42A0-1069-A2EA-08002B30309D} = "1"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\HideDesktopIcons\NewStartPanel
- {871C5380-42A0-1069-A2EA-08002B30309D} = "1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{2BE11047-844A-45c8-BE9C-1740193DC628}
- InfoTip = "@shdoclc.dll,-881"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{2BE11047-844A-45c8-BE9C-1740193DC628}
- LocalizedString = "@shdoclc.dll,-880"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{2BE11047-844A-45c8-BE9C-1740193DC628}\InProcServer32
- ThreadingModel = "Apartment"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{2BE11047-844A-45c8-BE9C-1740193DC628}\ShellFolder
- Attributes = "0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{2BE11047-844A-45c8-BE9C-1740193DC628}\shell\OpenHomePage
- MUIVerb = "@shdoclc.dll,-10241"
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\Windows NT\CurrentVersion\Windows
- Load = "%User Profile%\APPLIC~1\dxsetup.exe"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main
- From: Start Page = "http://www.{BLOCKED}4.cc"
To: Start Page = ""http://www.microsoft.com/isapi/redir.dll?prd=ie&pver=6&ar=msnhome""
- From: Start Page = "http://www.{BLOCKED}4.cc"
Step 5
Search and delete these components
- %User Profile%\Application Data\dxsetup.exe
- %User Profile%\Application Data\config.cmd
- %User Profile%\Application Data\backup.reg
Step 6
Scan your computer with your Trend Micro product to delete files detected as TROJ_STARTP.SMHQ. 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.
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