TROJ_DELF.SML1

October 14, 2013

ALIASES:

TrojanClicker:Win32/Delf.S (Microsoft); Generic.dx!xwj (McAfee); Trojan.Win32.Clicker!BT (Sunbelt); Trojan horse Clicker.ALXE.dropper (AVG)

PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

OVERALL RISK RATING:

DAMAGE POTENTIAL:

DISTRIBUTION POTENTIAL:

REPORTED INFECTION:

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 deletes itself after execution.

TECHNICAL DETAILS

File Size:

1,327,616 bytes

File Type:

EXE

Memory Resident:

Initial Samples Received Date:

14 Oct 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 deletes the following files:

%Desktop%.ini
%User Profile%\Quick Launch\Launch Internet Explorer Browser.lnk
%User Profile%\Quick Launch\Show Desktop.scf

(Note: %Desktop% is the current user's desktop, which is usually C:\Documents and Settings\{User Name}\Desktop on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\Desktop on Windows Vista and 7.. %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.)

It adds the following registry keys:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
HideDesktopIcons\ClassicStartMenu

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
HideDesktopIcons\NewStartPanel

HKEY_CLASSES_ROOT\CLSID\{26AEFBE8-063F-0647-829C-A93578895D80}

HKEY_CLASSES_ROOT\CLSID\{26AEFBE8-063F-0647-829C-A93578895D80}\
DefaultIcon

HKEY_CLASSES_ROOT\CLSID\{26AEFBE8-063F-0647-829C-A93578895D80}\
InProcServer32

HKEY_CLASSES_ROOT\CLSID\{26AEFBE8-063F-0647-829C-A93578895D80}\
shell

HKEY_CLASSES_ROOT\CLSID\{26AEFBE8-063F-0647-829C-A93578895D80}\
shell\a

HKEY_CLASSES_ROOT\CLSID\{26AEFBE8-063F-0647-829C-A93578895D80}\
shell\a\command

HKEY_CLASSES_ROOT\CLSID\{26AEFBE8-063F-0647-829C-A93578895D80}\
shell\b

HKEY_CLASSES_ROOT\CLSID\{26AEFBE8-063F-0647-829C-A93578895D80}\
shell\b\command

HKEY_CLASSES_ROOT\CLSID\{26AEFBE8-063F-0647-829C-A93578895D80}\
shell\find

HKEY_CLASSES_ROOT\CLSID\{26AEFBE8-063F-0647-829C-A93578895D80}\
shell\find\command

HKEY_CLASSES_ROOT\CLSID\{26AEFBE8-063F-0647-829C-A93578895D80}\
shell\find\ddeexec

HKEY_CLASSES_ROOT\CLSID\{26AEFBE8-063F-0647-829C-A93578895D80}\
shell\find\ddeexec\
application

HKEY_CLASSES_ROOT\CLSID\{26AEFBE8-063F-0647-829C-A93578895D80}\
shell\find\ddeexec\
topic

HKEY_CLASSES_ROOT\CLSID\{26AEFBE8-063F-0647-829C-A93578895D80}\
shell\Manage

HKEY_CLASSES_ROOT\CLSID\{26AEFBE8-063F-0647-829C-A93578895D80}\
shell\Manage\command

HKEY_CLASSES_ROOT\CLSID\{26AEFBE8-063F-0647-829C-A93578895D80}\
shell\??

HKEY_CLASSES_ROOT\CLSID\{26AEFBE8-063F-0647-829C-A93578895D80}\
shell\??\command

HKEY_CLASSES_ROOT\CLSID\{26AEFBE8-063F-0647-829C-A93578895D80}\
ShellFolder

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Desktop\NameSpace\{26AEFBE8-063F-0647-829C-A93578895D80}

It adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
HideDesktopIcons\ClassicStartMenu
{20D04FE0-3AEA-1069-A2D8-08002B30309D} = "1"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
HideDesktopIcons\ClassicStartMenu
{26AEFBE8-063F-0647-829C-A93578895D80} = "0"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
HideDesktopIcons\NewStartPanel
{20D04FE0-3AEA-1069-A2D8-08002B30309D} = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{26AEFBE8-063F-0647-829C-A93578895D80}
InfoTip = "@%SystemRoot%\system32\SHELL32.dll,-22913"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{26AEFBE8-063F-0647-829C-A93578895D80}
IntroText = "@%SystemRoot%\system32\SHELL32.dll,-31751"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{26AEFBE8-063F-0647-829C-A93578895D80}
LocalizedString = "@%SystemRoot%\system32\SHELL32.dll,-9216"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{26AEFBE8-063F-0647-829C-A93578895D80}
SortOrderIndex = "54"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{26AEFBE8-063F-0647-829C-A93578895D80}\InProcServer32
ThreadingModel = "Apartment"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{26AEFBE8-063F-0647-829C-A93578895D80}\shell\
find
SuppressionPolicy = "8"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{26AEFBE8-063F-0647-829C-A93578895D80}\shell\
Manage
SuppressionPolicy = "43c"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{26AEFBE8-063F-0647-829C-A93578895D80}\ShellFolder
Attributes = "0"

Dropping Routine

This Trojan drops the following files:

%System%\reg2.reg
%System%\odexl.exe
%System%\mspos.ime
%System%\Desktop.exe
%System%\mstl.ime
%User Profile%\Quick Launch\ÏÔÊ¾×ÀÃæ.lnk
%User Profile%\Quick Launch\Internet Explorer.lnk
%System Root%\$$a.bat

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.. %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.. %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

Other Details

This Trojan deletes itself after execution.

This report is generated via an automated analysis system.

SOLUTION

Minimum Scan Engine:

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

[ Learn More ]

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

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\HideDesktopIcons
- NewStartPanel

In HKEY_CLASSES_ROOT\CLSID
- {26AEFBE8-063F-0647-829C-A93578895D80}

In HKEY_CLASSES_ROOT\CLSID\{26AEFBE8-063F-0647-829C-A93578895D80}
- DefaultIcon

In HKEY_CLASSES_ROOT\CLSID\{26AEFBE8-063F-0647-829C-A93578895D80}
- InProcServer32

In HKEY_CLASSES_ROOT\CLSID\{26AEFBE8-063F-0647-829C-A93578895D80}
- shell

In HKEY_CLASSES_ROOT\CLSID\{26AEFBE8-063F-0647-829C-A93578895D80}\shell
- a

In HKEY_CLASSES_ROOT\CLSID\{26AEFBE8-063F-0647-829C-A93578895D80}\shell\a
- command

In HKEY_CLASSES_ROOT\CLSID\{26AEFBE8-063F-0647-829C-A93578895D80}\shell
- b

In HKEY_CLASSES_ROOT\CLSID\{26AEFBE8-063F-0647-829C-A93578895D80}\shell\b
- command

In HKEY_CLASSES_ROOT\CLSID\{26AEFBE8-063F-0647-829C-A93578895D80}\shell
- find

In HKEY_CLASSES_ROOT\CLSID\{26AEFBE8-063F-0647-829C-A93578895D80}\shell\find
- command

In HKEY_CLASSES_ROOT\CLSID\{26AEFBE8-063F-0647-829C-A93578895D80}\shell\find
- ddeexec

In HKEY_CLASSES_ROOT\CLSID\{26AEFBE8-063F-0647-829C-A93578895D80}\shell\find\ddeexec
- application

In HKEY_CLASSES_ROOT\CLSID\{26AEFBE8-063F-0647-829C-A93578895D80}\shell\find\ddeexec
- topic

In HKEY_CLASSES_ROOT\CLSID\{26AEFBE8-063F-0647-829C-A93578895D80}\shell
- Manage

In HKEY_CLASSES_ROOT\CLSID\{26AEFBE8-063F-0647-829C-A93578895D80}\shell\Manage
- command

In HKEY_CLASSES_ROOT\CLSID\{26AEFBE8-063F-0647-829C-A93578895D80}\shell
- ??

In HKEY_CLASSES_ROOT\CLSID\{26AEFBE8-063F-0647-829C-A93578895D80}\shell\??
- command

In HKEY_CLASSES_ROOT\CLSID\{26AEFBE8-063F-0647-829C-A93578895D80}
- ShellFolder

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Desktop\NameSpace
- {26AEFBE8-063F-0647-829C-A93578895D80}

To delete the registry key this malware/grayware created:

Open Registry Editor. Click Start>Run, type REGEDIT, then press Enter.
In the left panel, double-click the following:
HKEY_CURRENT_USER>Software>Microsoft>Windows>CurrentVersion>Explorer>HideDesktopIcons
Still in the left panel, locate and delete the key:
ClassicStartMenu
Again Still in the left panel, locate and delete the key:
NewStartPanel
In the left panel, double-click the following:
HKEY_CLASSES_ROOT>CLSID
Still in the left panel, locate and delete the key:
{26AEFBE8-063F-0647-829C-A93578895D80}
In the left panel, double-click the following:
HKEY_CLASSES_ROOT>CLSID>{26AEFBE8-063F-0647-829C-A93578895D80}
Still in the left panel, locate and delete the key:
DefaultIcon
Again Still in the left panel, locate and delete the key:
InProcServer32
Again Still in the left panel, locate and delete the key:
shell
In the left panel, double-click the following:
HKEY_CLASSES_ROOT>CLSID>{26AEFBE8-063F-0647-829C-A93578895D80}>shell
Still in the left panel, locate and delete the key:
a
In the left panel, double-click the following:
HKEY_CLASSES_ROOT>CLSID>{26AEFBE8-063F-0647-829C-A93578895D80}>shell>a
Still in the left panel, locate and delete the key:
command
Again Still in the left panel, locate and delete the key:
b
In the left panel, double-click the following:
HKEY_CLASSES_ROOT>CLSID>{26AEFBE8-063F-0647-829C-A93578895D80}>shell>b
Still in the left panel, locate and delete the key:
command
Again Still in the left panel, locate and delete the key:
find
In the left panel, double-click the following:
HKEY_CLASSES_ROOT>CLSID>{26AEFBE8-063F-0647-829C-A93578895D80}>shell>find
Still in the left panel, locate and delete the key:
command
Again Still in the left panel, locate and delete the key:
ddeexec
In the left panel, double-click the following:
HKEY_CLASSES_ROOT>CLSID>{26AEFBE8-063F-0647-829C-A93578895D80}>shell>find>ddeexec
Still in the left panel, locate and delete the key:
application
Again Still in the left panel, locate and delete the key:
topic
Again Still in the left panel, locate and delete the key:
Manage
In the left panel, double-click the following:
HKEY_CLASSES_ROOT>CLSID>{26AEFBE8-063F-0647-829C-A93578895D80}>shell>Manage
Still in the left panel, locate and delete the key:
command
Again Still in the left panel, locate and delete the key:
??
In the left panel, double-click the following:
HKEY_CLASSES_ROOT>CLSID>{26AEFBE8-063F-0647-829C-A93578895D80}>shell>??
Still in the left panel, locate and delete the key:
command
Again Still in the left panel, locate and delete the key:
ShellFolder
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows>CurrentVersion>Explorer>Desktop>NameSpace
Still in the left panel, locate and delete the key:
{26AEFBE8-063F-0647-829C-A93578895D80}
Close Registry Editor.

Step 3

Delete this registry value

[ Learn More ]

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\HideDesktopIcons\ClassicStartMenu
- {20D04FE0-3AEA-1069-A2D8-08002B30309D} = "1"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\HideDesktopIcons\ClassicStartMenu
- {26AEFBE8-063F-0647-829C-A93578895D80} = "0"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\HideDesktopIcons\NewStartPanel
- {20D04FE0-3AEA-1069-A2D8-08002B30309D} = "1"

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{26AEFBE8-063F-0647-829C-A93578895D80}
- InfoTip = "@%SystemRoot%\system32\SHELL32.dll,-22913"

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{26AEFBE8-063F-0647-829C-A93578895D80}
- IntroText = "@%SystemRoot%\system32\SHELL32.dll,-31751"

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{26AEFBE8-063F-0647-829C-A93578895D80}
- LocalizedString = "@%SystemRoot%\system32\SHELL32.dll,-9216"

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{26AEFBE8-063F-0647-829C-A93578895D80}
- SortOrderIndex = "54"

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{26AEFBE8-063F-0647-829C-A93578895D80}\InProcServer32
- ThreadingModel = "Apartment"

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{26AEFBE8-063F-0647-829C-A93578895D80}\shell\find
- SuppressionPolicy = "8"

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{26AEFBE8-063F-0647-829C-A93578895D80}\shell\Manage
- SuppressionPolicy = "43c"

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{26AEFBE8-063F-0647-829C-A93578895D80}\ShellFolder
- Attributes = "0"

To delete the registry value this malware/grayware created:

Open Registry Editor. Click Start>Run, type REGEDIT, then press Enter.
In the left panel, double-click the following:
HKEY_CURRENT_USER>Software>Microsoft>Windows>CurrentVersion>Explorer>HideDesktopIcons>ClassicStartMenu
In the right panel, locate and delete the entry:
{20D04FE0-3AEA-1069-A2D8-08002B30309D} = "1"
Again In the right panel, locate and delete the entry:
{26AEFBE8-063F-0647-829C-A93578895D80} = "0"
In the left panel, double-click the following:
HKEY_CURRENT_USER>Software>Microsoft>Windows>CurrentVersion>Explorer>HideDesktopIcons>NewStartPanel
In the right panel, locate and delete the entry:
{20D04FE0-3AEA-1069-A2D8-08002B30309D} = "1"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Classes>CLSID>{26AEFBE8-063F-0647-829C-A93578895D80}
In the right panel, locate and delete the entry:
InfoTip = "@%SystemRoot%\system32\SHELL32.dll,-22913"
Again In the right panel, locate and delete the entry:
IntroText = "@%SystemRoot%\system32\SHELL32.dll,-31751"
Again In the right panel, locate and delete the entry:
LocalizedString = "@%SystemRoot%\system32\SHELL32.dll,-9216"
Again In the right panel, locate and delete the entry:
SortOrderIndex = "54"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Classes>CLSID>{26AEFBE8-063F-0647-829C-A93578895D80}>InProcServer32
In the right panel, locate and delete the entry:
ThreadingModel = "Apartment"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Classes>CLSID>{26AEFBE8-063F-0647-829C-A93578895D80}>shell>find
In the right panel, locate and delete the entry:
SuppressionPolicy = "8"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Classes>CLSID>{26AEFBE8-063F-0647-829C-A93578895D80}>shell>Manage
In the right panel, locate and delete the entry:
SuppressionPolicy = "43c"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Classes>CLSID>{26AEFBE8-063F-0647-829C-A93578895D80}>ShellFolder
In the right panel, locate and delete the entry:
Attributes = "0"
Close Registry Editor.

Step 4

Search and delete these components

[ Learn More ]

There may be some components that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.

%System%\reg2.reg
%System%\odexl.exe
%System%\mspos.ime
%System%\Desktop.exe
%System%\mstl.ime
%User Profile%\Quick Launch\ÏÔÊ¾×ÀÃæ.lnk
%User Profile%\Quick Launch\Internet Explorer.lnk
%System Root%\a.bat

a.bat

In the Look In drop-down list, select My Computer then press Enter.

Once located, select the file then press SHIFT+DELETE to delete it.

Repeat the said steps for all files listed.

• For Windows Vista and Windows 7 users:

Click Start>Computer.
In the Search input box, type:
%System%\reg2.reg
%System%\odexl.exe
%System%\mspos.ime
%System%\Desktop.exe
%System%\mstl.ime
%User Profile%\Quick Launch\ÏÔÊ¾×ÀÃæ.lnk
%User Profile%\Quick Launch\Internet Explorer.lnk
%System Root%\a.bat
Once located, select the file then press SHIFT+DELETE to delete it.
Repeat the said steps for all files listed.
*Note: Read the following Microsoft page if these steps do not work on Windows 7.

Step 5

Scan your computer with your Trend Micro product to delete files detected as TROJ_DELF.SML1. 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 6

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.

%Desktop%.ini
%User Profile%\Quick Launch\Launch Internet Explorer Browser.lnk
%User Profile%\Quick Launch\Show Desktop.scf

Did this description help? Tell us how we did.

TROJ_DELF.SML1

OVERVIEW

TECHNICAL DETAILS

SOLUTION

Resources

Support

About Trend

Country Headquarters

TROJ_DELF.SML1

OVERVIEW

TECHNICAL DETAILS

SOLUTION

Resources

Support

About Trend

Country Headquarters

The Americas

Middle East & Africa

Europe

Asia & Pacific