TROJ_DLOADR.SMVE

October 08, 2012
 Modified by: Karl Dominguez
 PLATFORM:

Windows 2000, XP, Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

This Trojan may be dropped by other malware.

  TECHNICAL DETAILS

File Size:

Varies

File Type:

DLL

Memory Resident:

Yes

Initial Samples Received Date:

05 Mar 2010

Arrival Details

This Trojan may be dropped by the following malware:

  • TROJ_BREDOLAB
  • TROJ_SASFIS
  • TROJ_OFICLA

Installation

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

  • %System%\{random file name}

(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)

It injects itself into the following processes running in the affected system's memory:

  • svchost.exe

Autostart Technique

This Trojan modifies the following registry entry(ies) to enable its automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
Shell = Explorer.exe rundll32.exe {malware file name} {random export module name}

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

Other System Modifications

This Trojan adds the following registry keys:

HKEY_CLASSES_ROOT\idid

It adds the following registry entries as part of its installation routine:

HKEY_CURRENT_USER\Software\Microsoft\
Office\{version}\Word\
Security
AccessVBOM = 0

HKEY_CURRENT_USER\Software\Microsoft\
Office\{version}\Word\
Security
Level = 4

Other Details

This Trojan does the following:

  • It connects to a website to get its download instructions. Below are some of the sites that it connects to:
    • http://{BLOCKED}ania2010.ru/kuzy/bb.php
    • http://{BLOCKED}ourcecenter.com/dns/bb.php
    • http://{BLOCKED}oops.ru/images/bb.php
    • http://{BLOCKED}-resolve.com/packpack/bb.php
  • The server's reply may contain another URL in which an updated copy or another malware can be downloaded.
  • It saves this information to the following registry entry:
  • HKEY_CLASSES_ROOT\idid
  • url{number} = "{hex data}"

  SOLUTION

Minimum Scan Engine:

8.900

VSAPI PATTERN File:

6.897.00

VSAPI PATTERN Date:

05 Mar 2010

VSAPI PATTERN Date:

3/5/2010 12:00:00 AM

Step 1

For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

Step 2

Identify and delete files detected as TROJ_DLOADR.SMVE using either the Startup Disk or Recovery Console

[ 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_CLASSES_ROOT
    • idid

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_CURRENT_USER\Software\Microsoft\Office\{version}\Word\Security
    • AccessVBOM = 0
  • In HKEY_CURRENT_USER\Software\Microsoft\Office\{version}\Word\Security
    • Level = 4

Step 5

Restore this modified 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 NT\CurrentVersion\Winlogon
    • From: Shell = Explorer.exe rundll32.exe {malware file name} {random export module name}
      To: Explorer.exe

Step 6

Scan your computer with your Trend Micro product to delete files detected as TROJ_DLOADR.SMVE. 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.


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