Analysis by: Kathleen Notario
 PLATFORM:

Windows 2000, XP, Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  TECHNICAL DETAILS

File Size: 58,176 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 07 Aug 2010

Autostart Technique

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

HKEY_CLASSES_ROOT\CLSID\{B69F34DD-F0F9-42DC-9EDD-957187DA688D}\
InprocServer32
(default) = %Program Files%\Common Files\System\FlashOCX.DLL

Other System Modifications

This Trojan adds the following registry keys:

HKEY_CLASSES_ROOT\FlashPlayer.Class
=

HKEY_CLASSES_ROOT\CLSID\{B69F34DD-F0F9-42DC-9EDD-957187DA688D}
=

HKEY_CLASSES_ROOT\Interface\{269EADEF-9DF6-40BF-8EF0-13A9FF9DED1D}
=

HKEY_CLASSES_ROOT\TypeLib\{3ADCD351-7F41-4D06-A1D9-7F8EEC48F498}
=

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\MAO Settings
=

It adds the following registry entries:

HKEY_CURRENT_USER\Software\VB and VBA Program Settings\
Microsoft\Windows
IDurl = http://www.ii9i.net/mm/11/m.asp

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Ext\CLSID
{B69F34DD-F0F9-42DC-9EDD-957187DA688D} = 1

HKEY_CURRENT_USER\Software\Policies\
Microsoft\Internet Explorer\Restrictions
NoViewSource = 1

Dropping Routine

This Trojan drops the following files:

  • %Program Files%\Common Files\System\FlashOCX.DLL - also detected as TROJ_BHO.JJA

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files.)

  SOLUTION

Minimum Scan Engine: 8.900
VSAPI PATTERN File: 7.368.03
VSAPI PATTERN Date: 07 Aug 2010
VSAPI PATTERN Date: 8/7/2010 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

Restart in Safe Mode

[ Learn More ]

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_CURRENT_USER\Software\VB and VBA Program Settings\Microsoft\Windows
    • IDurl=http://www.ii9i.net/mm/11/m.asp
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Ext\CLSID
    • {B69F34DD-F0F9-42DC-9EDD-957187DA688D}=1
  • In HKEY_CURRENT_USER\Software\Policies\Microsoft\Internet Explorer\Restrictions
    • NoViewSource=1

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_CLASSES_ROOT
    • FlashPlayer.Class
  • In HKEY_CLASSES_ROOT\CLSID
    • {B69F34DD-F0F9-42DC-9EDD-957187DA688D}
  • In HKEY_CLASSES_ROOT\Interface
    • {269EADEF-9DF6-40BF-8EF0-13A9FF9DED1D}
  • In HKEY_CLASSES_ROOT\TypeLib
    • {3ADCD351-7F41-4D06-A1D9-7F8EEC48F498}
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer
    • MAO Settings
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects
    • {B69F34DD-F0F9-42DC-9EDD-957187DA68D}

Step 5

Scan your computer with your Trend Micro product to delete files detected as TROJ_BHO.JJA. 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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