TROJ_DAEKOM.CD


 ALIASES:

Trojan:Win32/Delf.EP (Microsoft); [002422e0.EXE]:BackDoor-AWQ.b!dri, [001808e0.EXE]:Generic.dx!iqy, [000baee0.EXE]:Generic.dx!iqy (McAfee); Downloader (Symantec); Backdoor.Win32.Hupigon.jelc (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan horse BackDoor.Hupigon5.ARUY.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:

988,160 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

23 Jun 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.

Installation

This Trojan drops the following copies of itself into the affected system:

  • %Windows%\WinSxS\5462725V.exe
  • %Program Files%\Microsoft.NET\9993577J.exe

(Note: %Windows% is the Windows folder, which is usually C:\Windows.. %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).)

Autostart Technique

This Trojan registers as a system service to ensure its automatic execution at every system startup by adding the following registry keys:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\KTdNWg\Parameters

Other System Modifications

This Trojan modifies the following file(s):

  • %Start Menu%\Programs\Internet Explorer.lnk
  • %Start Menu%\Programs\Windows Media Player.lnk
  • %Start Menu%\Programs\Accessories\Entertainment\Windows Media Player.lnk

(Note: %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.)

It deletes the following files:

  • %Windows%\Microsoft.NET\NETFXRepair.3082~.dll
  • %Windows%\Driver Cache\7590656I.dll

(Note: %Windows% is the Windows folder, which is usually C:\Windows.)

It adds the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Directory\shell\open\
command

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Drive\shell\open\
command

HKEY_CLASSES_ROOT\CLSID\{75EA2845-EAD5-486E-A339-59FED49289A6}

HKEY_CLASSES_ROOT\CLSID\{75EA2845-EAD5-486E-A339-59FED49289A6}\
InprocServer32

HKEY_CLASSES_ROOT\PROTOCOLS\Filter\
text/html

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{9B74BBC9-9516-4C06-9A9B-4594386F429D}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{9B74BBC9-9516-4C06-9A9B-4594386F429D}\1.0

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{9B74BBC9-9516-4C06-9A9B-4594386F429D}\1.0\
FLAGS

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{9B74BBC9-9516-4C06-9A9B-4594386F429D}\1.0\
0

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{9B74BBC9-9516-4C06-9A9B-4594386F429D}\1.0\
0\win32

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{9B74BBC9-9516-4C06-9A9B-4594386F429D}\1.0\
HELPDIR

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{3C563030-29AA-496A-85F9-2A91F3A7D203}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{3C563030-29AA-496A-85F9-2A91F3A7D203}\ProxyStubClsid

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{3C563030-29AA-496A-85F9-2A91F3A7D203}\ProxyStubClsid32

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{3C563030-29AA-496A-85F9-2A91F3A7D203}\TypeLib

HKEY_CLASSES_ROOT\CLSID\{C80F2C34-B4A7-4F23-A99E-D55DB29DC30D}

HKEY_CLASSES_ROOT\CLSID\{C80F2C34-B4A7-4F23-A99E-D55DB29DC30D}\
InprocServer32

HKEY_CLASSES_ROOT\OffCalc.OffCalcExt

HKEY_CLASSES_ROOT\OffCalc.OffCalcExt\Clsid

HKEY_CLASSES_ROOT\CLSID\{C80F2C34-B4A7-4F23-A99E-D55DB29DC30D}\
ProgID

HKEY_CLASSES_ROOT\CLSID\{C80F2C34-B4A7-4F23-A99E-D55DB29DC30D}\
Version

HKEY_CLASSES_ROOT\CLSID\{C80F2C34-B4A7-4F23-A99E-D55DB29DC30D}\
TypeLib

HKEY_CURRENT_USER\Software\Microsoft\
Office\Outlook\Addins\
OffCalc.OffCalcExt

HKEY_CURRENT_USER\Software\Microsoft\
Office\Excel\Addins\
OffCalc.OffCalcExt

HKEY_CURRENT_USER\Software\Microsoft\
Office\Word\Addins\
OffCalc.OffCalcExt

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\SvcHost\
VfPyJScLU

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{75EA2845-EAD5-486E-A339-59FED49289A6}\InprocServer32
ThreadingModel = "Apartment"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
PROTOCOLS\Filter\text/html
CLSID = "{75EA2845-EAD5-486E-A339-59FED49289A6}"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{3C563030-29AA-496A-85F9-2A91F3A7D203}\TypeLib
Version = "1.0"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{C80F2C34-B4A7-4F23-A99E-D55DB29DC30D}\InprocServer32
ThreadingModel = "Apartment"

HKEY_CURRENT_USER\Software\Microsoft\
Office\Outlook\Addins\
OffCalc.OffCalcExt
FriendlyName = "UIwMbRGV"

HKEY_CURRENT_USER\Software\Microsoft\
Office\Outlook\Addins\
OffCalc.OffCalcExt
LoadBehavior = "3"

HKEY_CURRENT_USER\Software\Microsoft\
Office\Excel\Addins\
OffCalc.OffCalcExt
FriendlyName = "JTePaK"

HKEY_CURRENT_USER\Software\Microsoft\
Office\Excel\Addins\
OffCalc.OffCalcExt
LoadBehavior = "3"

HKEY_CURRENT_USER\Software\Microsoft\
Office\Word\Addins\
OffCalc.OffCalcExt
FriendlyName = "XgRbLVgPz"

HKEY_CURRENT_USER\Software\Microsoft\
Office\Word\Addins\
OffCalc.OffCalcExt
LoadBehavior = "3"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\SvcHost
VfPyJScLU = "KTdNWg"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\SvcHost\
VfPyJScLU
CoInitializeSecurityParam = "1"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\KTdNWg
Description = "ΪÓû§ÌṩʹÓÃÖ÷Ìâ¹ÜÀíµÄ¾­Ñé¡£"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\KTdNWg\Parameters
ServiceDll = "%Windows%\Driver Cache\7590656I.dll"

Dropping Routine

This Trojan drops the following files:

  • %System%\HHDJe6cTg.exe
  • %Windows%\Microsoft.NET\NETFXRepair.3082~.dll.tmp
  • %Windows%\AppPatch\msimain~.dll.tmp
  • %Windows%\Driver Cache\7590656I.dll.tmp
  • %User Profile%\Quick Launch\Launch Internet Explorer Browser.lnk
  • %Windows%\DelA.bat
  • \WINDOWS\system32\config\systemprofile\Start Menu\Programs\Windows Media Player.lnk
  • \WINDOWS\system32\config\systemprofile\Start Menu\Programs\Accessories\Entertainment\Windows Media Player.lnk
  • %Program Files%\Internet Explorer\JUetzI.exe
  • %Program Files%\Windows Media Player\RtNWgQa.exe
  • %Program Files%\Windows Media Player\NtJTeOx.exe
  • %Program Files%\Internet Explorer\tRbLV.exe
  • %Program Files%\Windows Media Player\QtMVePy.exe
  • %Program Files%\Windows Media Player\aLtdNVeNWf.exe

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.. %Windows% is the Windows folder, which is usually C:\Windows.. %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.. %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).)

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

Restart in Safe Mode

[ Learn More ]

Step 3

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_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\KTdNWg
    • Parameters
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Directory\shell\open
    • command
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Drive\shell\open
    • command
  • In HKEY_CLASSES_ROOT\CLSID
    • {75EA2845-EAD5-486E-A339-59FED49289A6}
  • In HKEY_CLASSES_ROOT\CLSID\{75EA2845-EAD5-486E-A339-59FED49289A6}
    • InprocServer32
  • In HKEY_CLASSES_ROOT\PROTOCOLS\Filter
    • text/html
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib
    • {9B74BBC9-9516-4C06-9A9B-4594386F429D}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{9B74BBC9-9516-4C06-9A9B-4594386F429D}
    • 1.0
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{9B74BBC9-9516-4C06-9A9B-4594386F429D}\1.0
    • FLAGS
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{9B74BBC9-9516-4C06-9A9B-4594386F429D}\1.0
    • 0
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{9B74BBC9-9516-4C06-9A9B-4594386F429D}\1.0\0
    • win32
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{9B74BBC9-9516-4C06-9A9B-4594386F429D}\1.0
    • HELPDIR
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface
    • {3C563030-29AA-496A-85F9-2A91F3A7D203}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{3C563030-29AA-496A-85F9-2A91F3A7D203}
    • ProxyStubClsid
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{3C563030-29AA-496A-85F9-2A91F3A7D203}
    • ProxyStubClsid32
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{3C563030-29AA-496A-85F9-2A91F3A7D203}
    • TypeLib
  • In HKEY_CLASSES_ROOT\CLSID
    • {C80F2C34-B4A7-4F23-A99E-D55DB29DC30D}
  • In HKEY_CLASSES_ROOT\CLSID\{C80F2C34-B4A7-4F23-A99E-D55DB29DC30D}
    • InprocServer32
  • In HKEY_CLASSES_ROOT
    • OffCalc.OffCalcExt
  • In HKEY_CLASSES_ROOT\OffCalc.OffCalcExt
    • Clsid
  • In HKEY_CLASSES_ROOT\CLSID\{C80F2C34-B4A7-4F23-A99E-D55DB29DC30D}
    • ProgID
  • In HKEY_CLASSES_ROOT\CLSID\{C80F2C34-B4A7-4F23-A99E-D55DB29DC30D}
    • Version
  • In HKEY_CLASSES_ROOT\CLSID\{C80F2C34-B4A7-4F23-A99E-D55DB29DC30D}
    • TypeLib
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\Outlook\Addins
    • OffCalc.OffCalcExt
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\Excel\Addins
    • OffCalc.OffCalcExt
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\Word\Addins
    • OffCalc.OffCalcExt
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\SvcHost
    • VfPyJScLU

Step 4

Delete this registry value

[ 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_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{75EA2845-EAD5-486E-A339-59FED49289A6}\InprocServer32
    • ThreadingModel = "Apartment"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\PROTOCOLS\Filter\text/html
    • CLSID = "{75EA2845-EAD5-486E-A339-59FED49289A6}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{3C563030-29AA-496A-85F9-2A91F3A7D203}\TypeLib
    • Version = "1.0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{C80F2C34-B4A7-4F23-A99E-D55DB29DC30D}\InprocServer32
    • ThreadingModel = "Apartment"
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\Outlook\Addins\OffCalc.OffCalcExt
    • FriendlyName = "UIwMbRGV"
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\Outlook\Addins\OffCalc.OffCalcExt
    • LoadBehavior = "3"
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\Excel\Addins\OffCalc.OffCalcExt
    • FriendlyName = "JTePaK"
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\Excel\Addins\OffCalc.OffCalcExt
    • LoadBehavior = "3"
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\Word\Addins\OffCalc.OffCalcExt
    • FriendlyName = "XgRbLVgPz"
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\Word\Addins\OffCalc.OffCalcExt
    • LoadBehavior = "3"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\SvcHost
    • VfPyJScLU = "KTdNWg"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\SvcHost\VfPyJScLU
    • CoInitializeSecurityParam = "1"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\KTdNWg
    • Description = "ΪÓû§ÌṩʹÓÃÖ÷Ìâ¹ÜÀíµÄ¾­Ñé¡£"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\KTdNWg\Parameters
    • ServiceDll = "%Windows%\Driver Cache\7590656I.dll"

Step 5

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%\HHDJe6cTg.exe
  • %Windows%\Microsoft.NET\NETFXRepair.3082~.dll.tmp
  • %Windows%\AppPatch\msimain~.dll.tmp
  • %Windows%\Driver Cache\7590656I.dll.tmp
  • %User Profile%\Quick Launch\Launch Internet Explorer Browser.lnk
  • %Windows%\DelA.bat
  • \WINDOWS\system32\config\systemprofile\Start Menu\Programs\Windows Media Player.lnk
  • \WINDOWS\system32\config\systemprofile\Start Menu\Programs\Accessories\Entertainment\Windows Media Player.lnk
  • %Program Files%\Internet Explorer\JUetzI.exe
  • %Program Files%\Windows Media Player\RtNWgQa.exe
  • %Program Files%\Windows Media Player\NtJTeOx.exe
  • %Program Files%\Internet Explorer\tRbLV.exe
  • %Program Files%\Windows Media Player\QtMVePy.exe
  • %Program Files%\Windows Media Player\aLtdNVeNWf.exe

Step 6

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_DAEKOM.CD. 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 7

Restore deleted/modified files and/or registry entries from backup

*Note: Only Microsoft-related files/keys/values will be restored. If this malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.

    • %Start Menu%\Programs\Internet Explorer.lnk
    • %Start Menu%\Programs\Windows Media Player.lnk
    • %Start Menu%\Programs\Accessories\Entertainment\Windows Media Player.lnk

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.

  • %Windows%\Microsoft.NET\NETFXRepair.3082~.dll
  • %Windows%\Driver Cache\7590656I.dll


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