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BKDR_KEYLOGGE.LU

October 08, 2012
 Analysis by: Christopher Daniel So
 PLATFORM:

Windows 2000, XP, Server 2003

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

  • Threat Type: Backdoor

  • Destructiveness: Yes

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

However, as of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size:

155,707 bytes

File Type:

DLL

Memory Resident:

Yes

Initial Samples Received Date:

14 Jul 2010

Autostart Technique

This backdoor 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\zbpmpa
Description = Microsoft .NET Framework TPM

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\zbpmpa
DisplayName = zbpmpa

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\zbpmpa
ErrorControl = 1

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\zbpmpa
ImagePath = %System%\svchost.exe -k zbpmpa

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\zbpmpa
ObjectName = LocalSystem

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\zbpmpa
Start = 2

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\zbpmpa
Type = 272

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\zbpmpa\Parameters
ServiceDll = {malware file name}

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\SvcHost
zbpmpa = zbpmpa

Backdoor Routine

This backdoor connects to the following URL(s) to send and receive commands from a remote malicious user:

  • {BLOCKED}orben.3322.org:5588

However, as of this writing, the said sites are inaccessible.

  SOLUTION

Minimum Scan Engine:

8.900

FIRST VSAPI PATTERN FILE:

7.348.03

FIRST VSAPI PATTERN DATE:

30 Jul 2010

VSAPI OPR PATTERN File:

7.349.00

VSAPI OPR PATTERN Date:

30 Jul 2010

Step 1

Restart in Safe Mode

[ Learn More ]

Step 2

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
    • zbpmpa

Step 3

Scan your computer with your Trend Micro product to delete files detected as BKDR_KEYLOGGE.LU. 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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