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TROJ_DLOADER.EPD

January 01, 2013
 ALIASES:

Trojan:Win32/Alureon.A, Trojan:Win32/Alureon.A (Microsoft); [2.nsis]:generic!bg.eld, [3.nsis]:DNSChanger.f (McAfee); Trojan Horse (Symantec); Trojan-Downloader.Win32.Zlob.eie (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan.Crypt.DS (FSecure)

 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.

  TECHNICAL DETAILS

File Size:

114,771 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

22 Sep 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:

  • %System Root%\DOCUME~1
  • %System Root%\DOCUME~1\Wilbert
  • %User Profile%\LOCALS~1
  • %User Temp%\nss2.tmp
  • %Program Files%\DirectVideo
  • %System Root%\Documents and Settings\Wilbert
  • %Start Menu%\Programs\DirectVideo

(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 Trojan deletes the following files:

  • %User Temp%\nse1.tmp
  • %User Temp%\nss2.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\DirectVideo

HKEY_CLASSES_ROOT\DirectVideo\CLSID

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
DirectVideo

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
DirectVideo
UninstallString = "%Program Files%\DirectVideo\Uninstall.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
DirectVideo
InstallLocation = "%Program Files%\DirectVideo"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
DirectVideo
DisplayName = "DirectVideo"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
DirectVideo
DisplayIcon = "%Program Files%\DirectVideo\Uninstall.exe,0"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
DirectVideo
NoModify = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
DirectVideo
NoRepair = "1"

HKEY_CURRENT_USER\Software\DirectVideo
Start Menu Folder = "DirectVideo"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Tcpip\Parameters\
Interfaces\{E13A8633-E77B-49D7-830C-ED5632B6883F}
NameServer = "85.255.115.18,85.255.112.61"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Tcpip\Parameters\
Interfaces\{E13A8633-E77B-49D7-830C-ED5632B6883F}
DhcpNameServer = "85.255.115.18,85.255.112.61"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Tcpip\Parameters\
Interfaces\{706C9A23-9058-4780-9179-0EE8467AACB4}
NameServer = "85.255.115.18,85.255.112.61"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Tcpip\Parameters\
Interfaces\{706C9A23-9058-4780-9179-0EE8467AACB4}
DhcpNameServer = "85.255.115.18,85.255.112.61"

It modifies the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Shell Folders
Programs = "%Start Menu%\Programs"

(Note: The default value data of the said registry entry is %User Profile%\Start Menu\Programs.)

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Shell Folders
Personal = "%User Profile%\My Documents"

(Note: The default value data of the said registry entry is %User Profile%\My Documents.)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Shell Folders
Common Documents = "%User Profile%\Documents"

(Note: The default value data of the said registry entry is %System Root%\Documents and Settings\All Users\Documents.)

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Shell Folders
Desktop = "%Desktop%"

(Note: The default value data of the said registry entry is %User Profile%\Desktop.)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Shell Folders
Common Desktop = "%Desktop%"

(Note: The default value data of the said registry entry is %System Root%\Documents and Settings\All Users\Desktop.)

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Shell Folders
Start Menu = "%Start Menu%"

(Note: The default value data of the said registry entry is %User Profile%\Start Menu.)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Shell Folders
Common Start Menu = "%Start Menu%"

(Note: The default value data of the said registry entry is %System Root%\Documents and Settings\All Users\Start Menu.)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Shell Folders
Common AppData = "%User Profile%\Application Data"

(Note: The default value data of the said registry entry is %System Root%\Documents and Settings\All Users\Application Data.)

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Shell Folders
AppData = "%User Profile%\Application Data"

(Note: The default value data of the said registry entry is %User Profile%\Application Data.)

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Shell Folders
My Pictures = "%User Profile%\My Documents\My Pictures"

(Note: The default value data of the said registry entry is %User Profile%\My Documents\My Pictures.)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Shell Folders
CommonPictures = "%User Profile%\Documents\My Pictures"

(Note: The default value data of the said registry entry is %System Root%\Documents and Settings\All Users\Documents\My Pictures.)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Shell Folders
CommonMusic = "%User Profile%\Documents\My Music"

(Note: The default value data of the said registry entry is %System Root%\Documents and Settings\All Users\Documents\My Music.)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Shell Folders
CommonVideo = "%User Profile%\Documents\My Videos"

(Note: The default value data of the said registry entry is %System Root%\Documents and Settings\All Users\Documents\My Videos.)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Shell Folders
Common Programs = "%Start Menu%\Programs"

(Note: The default value data of the said registry entry is %System Root%\Documents and Settings\All Users\Start Menu\Programs.)

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Tcpip\Parameters
DhcpNameServer = "85.255.115.18 85.255.112.61"

(Note: The default value data of the said registry entry is 192.168.239.2.)

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Tcpip\Parameters
NameServer = "85.255.115.18 85.255.112.61"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
System = "kddej.exe"

Dropping Routine

This Trojan drops the following files:

  • %User Temp%\step2.exe
  • %User Temp%\step1.exe
  • %User Temp%\nss2.tmp\modern-header.bmp
  • %Program Files%\DirectVideo\Uninstall.exe
  • %Start Menu%\Programs\DirectVideo\Uninstall.lnk
  • %User Temp%\nss2.tmp\StartMenu.dll
  • %System%\kddej.exe

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

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

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

[ 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
    • DirectVideo
  • In HKEY_CLASSES_ROOT\DirectVideo
    • CLSID
  • In HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Uninstall
    • DirectVideo

Step 3

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\Microsoft\Windows\CurrentVersion\Uninstall\DirectVideo
    • UninstallString = "%Program Files%\DirectVideo\Uninstall.exe"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\DirectVideo
    • InstallLocation = "%Program Files%\DirectVideo"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\DirectVideo
    • DisplayName = "DirectVideo"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\DirectVideo
    • DisplayIcon = "%Program Files%\DirectVideo\Uninstall.exe,0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\DirectVideo
    • NoModify = "1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\DirectVideo
    • NoRepair = "1"
  • In HKEY_CURRENT_USER\Software\DirectVideo
    • Start Menu Folder = "DirectVideo"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Interfaces\{E13A8633-E77B-49D7-830C-ED5632B6883F}
    • NameServer = "85.255.115.18,85.255.112.61"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Interfaces\{E13A8633-E77B-49D7-830C-ED5632B6883F}
    • DhcpNameServer = "85.255.115.18,85.255.112.61"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Interfaces\{706C9A23-9058-4780-9179-0EE8467AACB4}
    • NameServer = "85.255.115.18,85.255.112.61"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Interfaces\{706C9A23-9058-4780-9179-0EE8467AACB4}
    • DhcpNameServer = "85.255.115.18,85.255.112.61"

Step 4

Restore these modified registry values

[ Learn More ]

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\CurrentVersion\Explorer\Shell Folders
    • From: Programs = "%Start Menu%\Programs"
      To: Programs = ""%User Profile%\Start Menu\Programs""
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders
    • From: Personal = "%User Profile%\My Documents"
      To: Personal = ""%User Profile%\My Documents""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders
    • From: Common Documents = "%User Profile%\Documents"
      To: Common Documents = ""%System Root%\Documents and Settings\All Users\Documents""
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders
    • From: Desktop = "%Desktop%"
      To: Desktop = ""%User Profile%\Desktop""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders
    • From: Common Desktop = "%Desktop%"
      To: Common Desktop = ""%System Root%\Documents and Settings\All Users\Desktop""
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders
    • From: Start Menu = "%Start Menu%"
      To: Start Menu = ""%User Profile%\Start Menu""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders
    • From: Common Start Menu = "%Start Menu%"
      To: Common Start Menu = ""%System Root%\Documents and Settings\All Users\Start Menu""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders
    • From: Common AppData = "%User Profile%\Application Data"
      To: Common AppData = ""%System Root%\Documents and Settings\All Users\Application Data""
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders
    • From: AppData = "%User Profile%\Application Data"
      To: AppData = ""%User Profile%\Application Data""
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders
    • From: My Pictures = "%User Profile%\My Documents\My Pictures"
      To: My Pictures = ""%User Profile%\My Documents\My Pictures""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders
    • From: CommonPictures = "%User Profile%\Documents\My Pictures"
      To: CommonPictures = ""%System Root%\Documents and Settings\All Users\Documents\My Pictures""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders
    • From: CommonMusic = "%User Profile%\Documents\My Music"
      To: CommonMusic = ""%System Root%\Documents and Settings\All Users\Documents\My Music""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders
    • From: CommonVideo = "%User Profile%\Documents\My Videos"
      To: CommonVideo = ""%System Root%\Documents and Settings\All Users\Documents\My Videos""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders
    • From: Common Programs = "%Start Menu%\Programs"
      To: Common Programs = ""%System Root%\Documents and Settings\All Users\Start Menu\Programs""
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters
    • From: DhcpNameServer = "85.255.115.18 85.255.112.61"
      To: DhcpNameServer = ""192.168.239.2""
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters
    • NameServer = "85.255.115.18 85.255.112.61"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
    • System = "kddej.exe"

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.
  • %User Temp%\step2.exe
  • %User Temp%\step1.exe
  • %User Temp%\nss2.tmp\modern-header.bmp
  • %Program Files%\DirectVideo\Uninstall.exe
  • %Start Menu%\Programs\DirectVideo\Uninstall.lnk
  • %User Temp%\nss2.tmp\StartMenu.dll
  • %System%\kddej.exe

Step 6

Search and delete these folders

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %System Root%\DOCUME~1
  • %System Root%\DOCUME~1\Wilbert
  • %User Profile%\LOCALS~1
  • %User Temp%\nss2.tmp
  • %Program Files%\DirectVideo
  • %System Root%\Documents and Settings\Wilbert
  • %Start Menu%\Programs\DirectVideo

Step 7

Scan your computer with your Trend Micro product to delete files detected as TROJ_DLOADER.EPD. 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%\nse1.tmp
  • %User Temp%\nss2.tmp


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