TROJ_BUBNIX.SMB

October 08, 2012
 Analysis by: Kathleen Notario
 PLATFORM:

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

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Trojan may be downloaded from remote sites by other malware.

It connects to certain websites to send and receive information.

  TECHNICAL DETAILS

File Size:

49,184 bytes

File Type:

DLL

Memory Resident:

Yes

Arrival Details

This Trojan may be downloaded from remote site(s) by the following malware:

Installation

This Trojan injects threads into the following normal process(es):

  • Services.exe  

Autostart Technique

This Trojan registers itself as a system service to ensure its automatic execution at every system startup by adding the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\

Services\{Malware file name}
(Default) =  

Other System Modifications

This Trojan adds the following registry keys:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\

Services\Tcpip\Parameters
MaxHashTable = "10000"
MaxUserPort = "0xfffe"
TcpFinWaitDealy = "10"
TcpTimeWaitDelay = "10"

Propagation

This Trojan obtains access to a Simple Mail Transfer Protocol (SMTP) server by querying the following Domain Naming System (DNS) servers:

Other Details

This Trojan connects to the following website to send and receive information:

  • http://{BLOCKED}za-flowers.biz/index.php?board=129.131  
  • http://{BLOCKED}za-flowers.biz/index.php?topic=173.172
  • http://{BLOCKED}za-flowers.biz/entry.php?
  • http://{BLOCKED}za-flowers.biz/login.php?user=
  • http://{BLOCKED}za-flowers.biz/forums.php?fid=112
  • http://{BLOCKED}za-flowers.biz/memberlist.php?mode=viewprofile&u=242
  • http://{BLOCKED}za-flowers.biz/download.php?file=3....
  • http://{BLOCKED}za-flowers.biz/logout.php?sessid={Random}

  SOLUTION

Minimum Scan Engine:

8.900

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 malware files dropped/downloaded by TROJ_BUBNIX.SMB

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_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
    • {Malware file name}

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_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
    • MaxHashTable = 10000
      MaxUserPort = 0xfffe
      TcpFinWaitDealy = 10
      TcpTimeWaitDelay = 10

Step 5

Scan your computer with your Trend Micro product to delete files detected as TROJ_BUBNIX.SMB. 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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