BKDR_LBAB.A

October 09, 2012
 Analysis by: Christopher Daniel So
 ALIASES:

Trojan.Win32.BHO.bnwy (Kaspersky), W32/BHO.BNWY!tr (Fortinet)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This backdoor may be dropped by other malware.

  TECHNICAL DETAILS

File Size:

Varies

File Type:

PE

Memory Resident:

Yes

Initial Samples Received Date:

01 Jul 2011

Arrival Details

This backdoor may be dropped by the following malware:

  • TROJ_MDROP.GVJ

Installation

This backdoor drops the following files:

  • %System%\MediaP.dll

(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.)

Autostart Technique

This backdoor registers itself as a BHO to ensure its automatic execution every time Internet Explorer is used by adding the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Browser Helper Objects\{C881E764-E445-4EAC-9480-898E25DAEE3B}

Other System Modifications

This backdoor adds the following registry keys:

HKEY_CLASSES_ROOT\MediaMonitor.MediaPlay

HKEY_CLASSES_ROOT\MediaMonitor.MediaPlay.1

HKEY_CLASSES_ROOT\CLSID\{C881E764-E445-4EAC-9480-898E25DAEE3B}

HKEY_CLASSES_ROOT\TypeLib\{0E05704B-07AB-41EB-8A17-F007AFBB5AA5}

HKEY_CLASSES_ROOT\Interface\{0DACF5D7-F1C0-4A37-B2A9-E03A9FBEB426}

It adds the following registry entries:

HKEY_CLASSES_ROOT\MediaMonitor.MediaPlay
(Default) = "MediaPlay Class"

HKEY_CLASSES_ROOT\MediaMonitor.MediaPlay\CLSID
(Default) = "{C881E764-E445-4EAC-9480-898E25DAEE3B}"

HKEY_CLASSES_ROOT\MediaMonitor.MediaPlay\CurVer
(Default) = "MediaMonitor.MediaPlay.1"

HKEY_CLASSES_ROOT\MediaMonitor.MediaPlay.1
(Default) = "MediaPlay Class"

HKEY_CLASSES_ROOT\MediaMonitor.MediaPlay.1\CLSID
(Default) = "{C881E764-E445-4EAC-9480-898E25DAEE3B}"

HKEY_CLASSES_ROOT\CLSID\{C881E764-E445-4EAC-9480-898E25DAEE3B}
(Default) = "MediaPlay Class"

HKEY_CLASSES_ROOT\CLSID\{C881E764-E445-4EAC-9480-898E25DAEE3B}\
InprocServer32
(Default) = "%System%\MediaP.dll"

HKEY_CLASSES_ROOT\CLSID\{C881E764-E445-4EAC-9480-898E25DAEE3B}\
TypeLib
(Default) = "{0E05704B-07AB-41EB-8A17-F007AFBB5AA5}"

HKEY_CLASSES_ROOT\Interface\{0DACF5D7-F1C0-4A37-B2A9-E03A9FBEB426}
(Default) = "IMediaPlay"

HKEY_CLASSES_ROOT\Interface\{0DACF5D7-F1C0-4A37-B2A9-E03A9FBEB426}\
TypeLib
(Default) = "{0E05704B-07AB-41EB-8A17-F007AFBB5AA5}"

HKEY_CLASSES_ROOT\TypeLib\{0E05704B-07AB-41EB-8A17-F007AFBB5AA5}\
1.0
(Default) = "MediaMonitor 1.0 Type Library"

HKEY_CLASSES_ROOT\TypeLib\{0E05704B-07AB-41EB-8A17-F007AFBB5AA5}\
1.0\0\win32
(Default) = "%System%\MediaP.dll"

NOTES:
It connects to the following URL when Internet Explorer is opened:

  • http://www.{BLOCKED}babys.com/cgi-bin/mmlogin.cgi

  SOLUTION

Minimum Scan Engine:

8.900

FIRST VSAPI PATTERN FILE:

8.260.04

FIRST VSAPI PATTERN DATE:

01 Jul 2011

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

Remove the malware/grayware file that dropped/downloaded BKDR_LBAB.A

Step 3

Close all opened browser windows

Step 4

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\Explorer\Browser Helper Objects
    • {C881E764-E445-4EAC-9480-898E25DAEE3B}
  • In HKEY_CLASSES_ROOT
    • MediaMonitor.MediaPlay
  • In HKEY_CLASSES_ROOT
    • MediaMonitor.MediaPlay.1
  • In HKEY_CLASSES_ROOT\CLSID
    • {C881E764-E445-4EAC-9480-898E25DAEE3B}
  • In HKEY_CLASSES_ROOT\TypeLib
    • {0E05704B-07AB-41EB-8A17-F007AFBB5AA5}
  • In HKEY_CLASSES_ROOT\Interface
    • {0DACF5D7-F1C0-4A37-B2A9-E03A9FBEB426}

Step 5

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%\MediaP.dll

Step 6

Scan your computer with your Trend Micro product to delete files detected as BKDR_LBAB.A. 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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