ALIASES:

Worm:Win32/Ainslot.A (Microsoft); W32.Shadesrat (Symantec); Worm.Win32.Luder.akbe (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:

  • Threat Type: Worm

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This worm 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: 713,216 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 23 May 2013

Arrival Details

This worm 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 worm creates the following folders:

  • %User Profile%\Application Data\Java
  • %User Profile%\Java\Java Update

(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.)

Autostart Technique

This worm adds the following registry entries to enable its automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
java = "%User Profile%\Java Update\jusched.exe"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
java = "%User Profile%\Java Update\jusched.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\{3EFAECFA-5544-BD6E-CCED-AC9A6C5BEEF2}
StubPath = "%User Profile%\Java Update\jusched.exe"

HKEY_CURRENT_USER\Software\Microsoft\
Active Setup\Installed Components\{3EFAECFA-5544-BD6E-CCED-AC9A6C5BEEF2}
StubPath = "%User Profile%\Java Update\jusched.exe"

Other System Modifications

This worm deletes the following files:

  • %Windows%\Microsoft.NET\Framework\v2.0.50727\config\security.config.cch.1872.102265
  • %Windows%\Microsoft.NET\Framework\v2.0.50727\config\enterprisesec.config.cch.1872.102265
  • %User Profile%\v2.0.50727.42\security.config.cch.1872.102437

(Note: %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.)

It adds the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Explorer\run

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\{3EFAECFA-5544-BD6E-CCED-AC9A6C5BEEF2}

HKEY_CURRENT_USER\SOFTWARE\Microsoft\
Active Setup\Installed Components\{3EFAECFA-5544-BD6E-CCED-AC9A6C5BEEF2}

HKEY_CURRENT_USER\Software\VB and VBA Program Settings\
SrvID\ID

HKEY_CURRENT_USER\Software\VB and VBA Program Settings\
INSTALL\DATE

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Control\MediaResources\msvideo

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Explorer\run
java = "%User Profile%\Java Update\jusched.exe"

HKEY_CURRENT_USER\Software\VB and VBA Program Settings\
SrvID\ID
UNJYTAAZ2Q = "1"

HKEY_CURRENT_USER\Software\VB and VBA Program Settings\
INSTALL\DATE
UNJYTAAZ2Q = "May 20, 2013"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
%Windows%\Microsoft.NET\Framework\v2.0.50727\vbc.exe = "{random characters}"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile
DoNotAllowExceptions = "0"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
%User Profile%\Java Update\jusched.exe = "{random characters}"

Dropping Routine

This worm drops the following files:

  • %User Profile%\Java Update\jusched.exe
  • %User Temp%\84520.exe

(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.. %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.)

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\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer
    • run
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components
    • {3EFAECFA-5544-BD6E-CCED-AC9A6C5BEEF2}
  • In HKEY_CURRENT_USER\SOFTWARE\Microsoft\Active Setup\Installed Components
    • {3EFAECFA-5544-BD6E-CCED-AC9A6C5BEEF2}
  • In HKEY_CURRENT_USER\Software\VB and VBA Program Settings\SrvID
    • ID
  • In HKEY_CURRENT_USER\Software\VB and VBA Program Settings\INSTALL
    • DATE
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\MediaResources
    • msvideo

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\Microsoft\Windows\CurrentVersion\Run
    • java = "%User Profile%\Java Update\jusched.exe"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • java = "%User Profile%\Java Update\jusched.exe"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components\{3EFAECFA-5544-BD6E-CCED-AC9A6C5BEEF2}
    • StubPath = "%User Profile%\Java Update\jusched.exe"
  • In HKEY_CURRENT_USER\Software\Microsoft\Active Setup\Installed Components\{3EFAECFA-5544-BD6E-CCED-AC9A6C5BEEF2}
    • StubPath = "%User Profile%\Java Update\jusched.exe"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\run
    • java = "%User Profile%\Java Update\jusched.exe"
  • In HKEY_CURRENT_USER\Software\VB and VBA Program Settings\SrvID\ID
    • UNJYTAAZ2Q = "1"
  • In HKEY_CURRENT_USER\Software\VB and VBA Program Settings\INSTALL\DATE
    • UNJYTAAZ2Q = "May 20, 2013"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
    • %Windows%\Microsoft.NET\Framework\v2.0.50727\vbc.exe = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile
    • DoNotAllowExceptions = "0"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
    • %User Profile%\Java Update\jusched.exe = "{random characters}"

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 Profile%\Java Update\jusched.exe
  • %User Temp%\84520.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.
  • %User Profile%\Application Data\Java
  • %User Profile%\Java\Java Update

Step 7

Restart in normal mode and scan your computer with your Trend Micro product for files detected as WORM_LUDER.CE. 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.

  • %Windows%\Microsoft.NET\Framework\v2.0.50727\config\security.config.cch.1872.102265
  • %Windows%\Microsoft.NET\Framework\v2.0.50727\config\enterprisesec.config.cch.1872.102265
  • %User Profile%\v2.0.50727.42\security.config.cch.1872.102437


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