TROJ_REFROSO_0000029.TOMA
Trojan:Win32/Startpage.LG (Microsoft); Generic StartPage!bdq (McAfee); Trojan.Startpage (Symantec); PAK:WScript, Trojan.JS.StartPage.cg, Trojan.JS.StartPage.cg (Kaspersky); Trojan.Win32.Generic.pak!cobra (Sunbelt); Trojan.Agent.Crypt.C (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.
It disables Task Manager, Registry Editor, and Folder Options.
TECHNICAL DETAILS
140,312 bytes
EXE
No
14 Jun 2012
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:
- %Program Files%\Google Map
- %Program Files%\Google Map\Common
- %Program Files%\Google Map\Common\0125
- %Program Files%\Google Map\Common\0125\temp2
- %Program Files%\Internet Explorer\MUIE
(Note: %Program Files% is the default Program Files folder, usually C:\Program Files.)
Other System Modifications
This Trojan adds the following registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Direct3D\Drivers\SoftInfo
HKEY_CLASSES_ROOT\.gir3
HKEY_CLASSES_ROOT\gir3file
HKEY_CLASSES_ROOT\gir3file\DefaultIcon
HKEY_CLASSES_ROOT\gir3file\shell
HKEY_CLASSES_ROOT\gir3file\shell\
open\command
HKEY_CLASSES_ROOT\gir3file\shellex\
ContextMenuHandlers
HKEY_CLASSES_ROOT\.gir3b
HKEY_CLASSES_ROOT\gir3bfile
HKEY_CLASSES_ROOT\gir3bfile\DefaultIcon
HKEY_CLASSES_ROOT\gir3bfile\shell
HKEY_CLASSES_ROOT\gir3bfile\shell\
open\command
HKEY_CLASSES_ROOT\gir3bfile\shellex\
ContextMenuHandlers
HKEY_CLASSES_ROOT\.gir3a
HKEY_CLASSES_ROOT\gir3afile
HKEY_CLASSES_ROOT\gir3afile\DefaultIcon
HKEY_CLASSES_ROOT\gir3afile\shell
HKEY_CLASSES_ROOT\gir3afile\shell\
open\command
HKEY_CLASSES_ROOT\gir3afile\shellex\
ContextMenuHandlers
HKEY_CLASSES_ROOT\CLSID\{1f4de370-d627-11d1-ba4f-00a0c91eedba}\
shell
HKEY_CLASSES_ROOT\CLSID\{1f4de370-d627-11d1-ba4f-00a0c91eedba}\
shell\OpenHomePage
HKEY_CLASSES_ROOT\CLSID\{1f4de370-d627-11d1-ba4f-00a0c91eedba}\
shell\OpenHomePage\Command
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Direct3D\Drivers\SoftInfo
FileName = "gir3"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Direct3D\Drivers\SoftInfo
ProPath = "0125"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Direct3D\Drivers\SoftInfo
ProName = "tfnxbb"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Direct3D\Drivers\SoftInfo
GUIDNum = "{1f4de370-d627-11d1-ba4f-00a0c91eedba}"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Direct3D\Drivers\SoftInfo
GUIDTao = "{A3C71C06-E86A-4CA0-B23A-89F1D5814FC6}"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Direct3D\Drivers\SoftInfo
IeToName = "dgbsd"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Direct3D\Drivers\SoftInfo
CreateDate = "0417"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Direct3D\Drivers\SoftInfo
RSP = "Google Map"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
HideDesktopIcons\ClassicStartMenu
{871C5380-42A0-1069-A2EA-08002B30309D} = "1"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
HideDesktopIcons
ClassicStartMenu = "1"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Desktop\CleanupWiz
NoRun = "1"
It modifies the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{1f4de370-d627-11d1-ba4f-00a0c91eedba}
LocalizedString = "Internet Explorer"
(Note: The default value data of the said registry entry is {random values}.)
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{1f4de370-d627-11d1-ba4f-00a0c91eedba}\ShellFolder
Attributes = "0"
(Note: The default value data of the said registry entry is 20180000.)
It creates the following registry entry(ies) to disable Task Manager, Registry Tools and Folder Options:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer
NoDesktopCleanupWizard = "1"
It deletes the following registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Desktop\NameSpace\{E17D4FC0-5564-11D1-83F2-00A0C90DC849}
Dropping Routine
This Trojan drops the following files:
- %System Root%\?????(GUID)_Encode.jse
- %Program Files%\Google Map\Common\0125\temp2\tmp317.bak
- %Program Files%\Google Map\Common\0125\temp2\tmp572.bak
- %Program Files%\Google Map\Common\0125\temp2\tmp71.bak
- %Program Files%\Google Map\Common\0125\temp2\tmp850.bak
- %Program Files%\Google Map\Common\0125\temp2\tmp51.bak
- %Program Files%\Google Map\Common\0125\temp2\tmp807.bak
- %Program Files%\Google Map\Common\0125\desktop.scf
- %Program Files%\Google Map\Common\0125\temp2\3944.tmp
- %Program Files%\Google Map\Common\0125\temp2\130.tmp
- %Program Files%\Google Map\Common\0125\temp2\3436.tmp
- %Program Files%\Google Map\Common\0125\temp2\9993.tmp
- %Program Files%\Google Map\Common\0125\temp2\¦???????.bak
- %Program Files%\Google Map\Common\0125\temp2\¦???????2.bak
- %Program Files%\Google Map\Common\0125\temp2\¦71755???-?????????!.bak
- %Program Files%\Google Map\Common\0125\temp2\¦71755???-?????????!2.bak
- %Program Files%\Google Map\Common\0125\temp2\??? - ?!???.bak
- %Program Files%\Google Map\Common\0125\temp2\??? - ?!???2.bak
- %Program Files%\Google Map\Common\0125\temp2\????-???? ????.bak
- %Program Files%\Google Map\Common\0125\temp2\????-???? ????2.bak
- %Program Files%\Google Map\Common\0125\temp2\VANCL ???? ?????? ?? ?? ? ?? ??.bak
- %Program Files%\Google Map\Common\0125\temp2\VANCL ???? ?????? ?? ?? ? ?? ??2.bak
- %Program Files%\Google Map\Common\0125\temp2\????-???????????????????????????.bak
- %Program Files%\Google Map\Common\0125\temp2\????-???????????????????????????2.bak
- %Program Files%\Google Map\Common\0125\temp2\???????????,??,??,??,???,??,???????.bak
- %Program Files%\Google Map\Common\0125\temp2\???????????,??,??,??,???,??,???????2.bak
- %Program Files%\Google Map\Common\0125\temp2\?????????:????????????????????????,????,????.bak
- %Program Files%\Google Map\Common\0125\temp2\?????????:????????????????????????,????,????2.bak
- %Program Files%\Google Map\Common\0125\temp2\???????,??????,????????! ???? ?? ?? ??? ???? ???? ???? ???????!.bak
- %Program Files%\Google Map\Common\0125\temp2\???????,??????,????????! ???? ?? ?? ??? ???? ???? ???? ???????!2.bak
- %Program Files%\Google Map\Common\0125\temp2\¦??????-????????????.bak
- %Program Files%\Google Map\Common\0125\temp2\¦??????-????????????2.bak
- %Program Files%\Google Map\Common\0125\temp2\¦35dh????-??????????!.bak
- %Program Files%\Google Map\Common\0125\temp2\¦35dh????-??????????!2.bak
- %Program Files%\Google Map\Common\0125\temp2\??????,????????????!???????.bak
- %Program Files%\Google Map\Common\0125\temp2\??????,????????????!???????2.bak
- %Program Files%\Google Map\Common\0125\temp2\???????.bak
- %Program Files%\Google Map\Common\0125\temp2\???????2.bak
- %Program Files%\Internet Explorer\MUIE\iexplore.exe
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %Program Files% is the default Program Files folder, usually C:\Program Files.)
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
Enable Registry Editor, Task Manager, and Folder options
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_LOCAL_MACHINE\SOFTWARE\Microsoft\Direct3D\Drivers
- SoftInfo
- In HKEY_CLASSES_ROOT
- .gir3
- In HKEY_CLASSES_ROOT
- gir3file
- In HKEY_CLASSES_ROOT\gir3file
- DefaultIcon
- In HKEY_CLASSES_ROOT\gir3file
- shell
- In HKEY_CLASSES_ROOT\gir3file\shell\open
- command
- In HKEY_CLASSES_ROOT\gir3file\shellex
- ContextMenuHandlers
- In HKEY_CLASSES_ROOT
- .gir3b
- In HKEY_CLASSES_ROOT
- gir3bfile
- In HKEY_CLASSES_ROOT\gir3bfile
- DefaultIcon
- In HKEY_CLASSES_ROOT\gir3bfile
- shell
- In HKEY_CLASSES_ROOT\gir3bfile\shell\open
- command
- In HKEY_CLASSES_ROOT\gir3bfile\shellex
- ContextMenuHandlers
- In HKEY_CLASSES_ROOT
- .gir3a
- In HKEY_CLASSES_ROOT
- gir3afile
- In HKEY_CLASSES_ROOT\gir3afile
- DefaultIcon
- In HKEY_CLASSES_ROOT\gir3afile
- shell
- In HKEY_CLASSES_ROOT\gir3afile\shell\open
- command
- In HKEY_CLASSES_ROOT\gir3afile\shellex
- ContextMenuHandlers
- In HKEY_CLASSES_ROOT\CLSID\{1f4de370-d627-11d1-ba4f-00a0c91eedba}
- shell
- In HKEY_CLASSES_ROOT\CLSID\{1f4de370-d627-11d1-ba4f-00a0c91eedba}\shell
- OpenHomePage
- In HKEY_CLASSES_ROOT\CLSID\{1f4de370-d627-11d1-ba4f-00a0c91eedba}\shell\OpenHomePage
- Command
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_LOCAL_MACHINE\SOFTWARE\Microsoft\Direct3D\Drivers\SoftInfo
- FileName = "gir3"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Direct3D\Drivers\SoftInfo
- ProPath = "0125"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Direct3D\Drivers\SoftInfo
- ProName = "tfnxbb"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Direct3D\Drivers\SoftInfo
- GUIDNum = "{1f4de370-d627-11d1-ba4f-00a0c91eedba}"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Direct3D\Drivers\SoftInfo
- GUIDTao = "{A3C71C06-E86A-4CA0-B23A-89F1D5814FC6}"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Direct3D\Drivers\SoftInfo
- IeToName = "dgbsd"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Direct3D\Drivers\SoftInfo
- CreateDate = "0417"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Direct3D\Drivers\SoftInfo
- RSP = "Google Map"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\HideDesktopIcons\ClassicStartMenu
- {871C5380-42A0-1069-A2EA-08002B30309D} = "1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\HideDesktopIcons
- ClassicStartMenu = "1"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Desktop\CleanupWiz
- NoRun = "1"
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_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{1f4de370-d627-11d1-ba4f-00a0c91eedba}
- From: LocalizedString = "Internet Explorer"
To: LocalizedString = ""{random values}""
- From: LocalizedString = "Internet Explorer"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{1f4de370-d627-11d1-ba4f-00a0c91eedba}\ShellFolder
- From: Attributes = "0"
To: Attributes = ""20180000""
- From: Attributes = "0"
Step 6
Search and delete these files
- %System Root%\?????(GUID)_Encode.jse
- %Program Files%\Google Map\Common\0125\temp2\tmp317.bak
- %Program Files%\Google Map\Common\0125\temp2\tmp572.bak
- %Program Files%\Google Map\Common\0125\temp2\tmp71.bak
- %Program Files%\Google Map\Common\0125\temp2\tmp850.bak
- %Program Files%\Google Map\Common\0125\temp2\tmp51.bak
- %Program Files%\Google Map\Common\0125\temp2\tmp807.bak
- %Program Files%\Google Map\Common\0125\desktop.scf
- %Program Files%\Google Map\Common\0125\temp2\3944.tmp
- %Program Files%\Google Map\Common\0125\temp2\130.tmp
- %Program Files%\Google Map\Common\0125\temp2\3436.tmp
- %Program Files%\Google Map\Common\0125\temp2\9993.tmp
- %Program Files%\Google Map\Common\0125\temp2\¦???????.bak
- %Program Files%\Google Map\Common\0125\temp2\¦???????2.bak
- %Program Files%\Google Map\Common\0125\temp2\¦71755???-?????????!.bak
- %Program Files%\Google Map\Common\0125\temp2\¦71755???-?????????!2.bak
- %Program Files%\Google Map\Common\0125\temp2\??? - ?!???.bak
- %Program Files%\Google Map\Common\0125\temp2\??? - ?!???2.bak
- %Program Files%\Google Map\Common\0125\temp2\????-???? ????.bak
- %Program Files%\Google Map\Common\0125\temp2\????-???? ????2.bak
- %Program Files%\Google Map\Common\0125\temp2\VANCL ???? ?????? ?? ?? ? ?? ??.bak
- %Program Files%\Google Map\Common\0125\temp2\VANCL ???? ?????? ?? ?? ? ?? ??2.bak
- %Program Files%\Google Map\Common\0125\temp2\????-???????????????????????????.bak
- %Program Files%\Google Map\Common\0125\temp2\????-???????????????????????????2.bak
- %Program Files%\Google Map\Common\0125\temp2\???????????,??,??,??,???,??,???????.bak
- %Program Files%\Google Map\Common\0125\temp2\???????????,??,??,??,???,??,???????2.bak
- %Program Files%\Google Map\Common\0125\temp2\?????????:????????????????????????,????,????.bak
- %Program Files%\Google Map\Common\0125\temp2\?????????:????????????????????????,????,????2.bak
- %Program Files%\Google Map\Common\0125\temp2\???????,??????,????????! ???? ?? ?? ??? ???? ???? ???? ???????!.bak
- %Program Files%\Google Map\Common\0125\temp2\???????,??????,????????! ???? ?? ?? ??? ???? ???? ???? ???????!2.bak
- %Program Files%\Google Map\Common\0125\temp2\¦??????-????????????.bak
- %Program Files%\Google Map\Common\0125\temp2\¦??????-????????????2.bak
- %Program Files%\Google Map\Common\0125\temp2\¦35dh????-??????????!.bak
- %Program Files%\Google Map\Common\0125\temp2\¦35dh????-??????????!2.bak
- %Program Files%\Google Map\Common\0125\temp2\??????,????????????!???????.bak
- %Program Files%\Google Map\Common\0125\temp2\??????,????????????!???????2.bak
- %Program Files%\Google Map\Common\0125\temp2\???????.bak
- %Program Files%\Google Map\Common\0125\temp2\???????2.bak
- %Program Files%\Internet Explorer\MUIE\iexplore.exe
Step 7
Search and delete these folders
- %Program Files%\Google Map
- %Program Files%\Google Map\Common
- %Program Files%\Google Map\Common\0125
- %Program Files%\Google Map\Common\0125\temp2
- %Program Files%\Internet Explorer\MUIE
Step 8
Scan your computer with your Trend Micro product to delete files detected as TROJ_REFROSO_0000029.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 these deleted registry keys/values from backup
*Note: Only Microsoft-related keys/values will be restored. If the malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Desktop\NameSpace
- {E17D4FC0-5564-11D1-83F2-00A0C90DC849}
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