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BKDR_DBIT.IW

October 27, 2010
 PLATFORM:

Windows 98, ME, NT, 2000, XP, Server 2003

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Backdoor executes then deletes itself afterward.



  TECHNICAL DETAILS

File Size:

135168 bytes

Memory Resident:

Yes

Initial Samples Received Date:

17 Dec 2009


Installation


This Backdoor executes then deletes itself afterward.



Other System Modifications


This Backdoor adds the following registry keys:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\WmdmPmSN\Enum
(Default) =  


  SOLUTION

Minimum Scan Engine:

8.900

VSAPI OPR PATTERN File:

6.528.02

VSAPI OPR PATTERN Date:

10 Oct 2009


Step 1


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. Before you could do this, you must restart in Safe Mode. For instructions on how to do this, you may refer to this page If the preceding step requires you to restart in safe mode, you may proceed to edit the system registry.

 
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\WmdmPmSN
    • Enum


Step 2


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\SYSTEM\CurrentControlSet\Services\WmdmPmSN
    • From: Start = 2
      To: Start = 3


Step 3


Search and delete this file

[ Learn More ]
There may be some component files 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%\dllcache\mspmsnsv.dll


Step 4


Scan your computer with your Trend Micro product to delete files detected as BKDR_DBIT.IW 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 5


Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware/spyware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.

  • %System%\mspmsnsv.dll


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