ALIASES:

Backdoor:Win32/Morix.B (Microsoft); New Win32 !! (McAfee); Spyware.Ardakey, Trojan.Dropper (Symantec); P2P-Worm.Win32.Palevo.cqho (Kaspersky); Trojan.Win32.Packer.RLPackV1.21 (ep) (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.

It deletes itself after execution.

  TECHNICAL DETAILS

File Size: 86,591 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 17 Oct 2012

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:

  • %System Root%\%Program Files%

(Note: %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 System Modifications

This worm deletes the following files:

  • %System Root%\ntldr.sys

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

It deletes the following folders:

  • %System Root%\%Progr~1

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

It adds the following registry keys:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Control\MediaResources\msvideo

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Winsock
InstallModule = "{malware path and file name}"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Winsock
ConnectGroup = "Default"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Winsock
MyVerSion = "2011"

It modifies the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\AppMgmt\Parameters
ServiceDll = "%Program Files%\%Program Files%\Wdcp.dll"

(Note: The default value data of the said registry entry is {random values}.)

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\AppMgmt
Start = "2"

(Note: The default value data of the said registry entry is 3.)

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\AppMgmt
Type = "12"

(Note: The default value data of the said registry entry is 20.)

Dropping Routine

This worm drops the following files:

  • %System Root%\ntldr.SYS
  • %Windows%\best.bat
  • %Windows%\362.vbs
  • %Program Files%\%Program Files%\laass.exe
  • %Program Files%\%Program Files%\363.VBS
  • %Program Files%\%Program Files%\Cest.bat
  • %Program Files%\%Program Files%\SCR.SCR
  • %Program Files%\%Program Files%\~
  • %Program Files%\%Program Files%\Wdcp.dll

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

Other Details

This worm deletes itself after execution.

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_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\MediaResources
    • msvideo

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\SYSTEM\ControlSet001\Services\Winsock
    • InstallModule = "{malware path and file name}"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Winsock
    • ConnectGroup = "Default"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Winsock
    • MyVerSion = "2011"

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_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\AppMgmt\Parameters
    • From: ServiceDll = "%Program Files%\%Program Files%\Wdcp.dll"
      To: ServiceDll = ""{random values}""
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\AppMgmt
    • From: Start = "2"
      To: Start = ""3""
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\AppMgmt
    • From: Type = "12"
      To: Type = ""20""

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 Root%\ntldr.SYS
  • %Windows%\best.bat
  • %Windows%\362.vbs
  • %Program Files%\%Program Files%\laass.exe
  • %Program Files%\%Program Files%\363.VBS
  • %Program Files%\%Program Files%\Cest.bat
  • %Program Files%\%Program Files%\SCR.SCR
  • %Program Files%\%Program Files%\~
  • %Program Files%\%Program Files%\Wdcp.dll

Step 6

Search and delete this folder

[ 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%\%Program Files%

Step 7

Scan your computer with your Trend Micro product to delete files detected as WORM_PALEVO.SMUS. 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.

  • %System Root%\ntldr.sys


Did this description help? Tell us how we did.