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BKDR_POISON.RXPQ

October 09, 2012
 Analysis by: Roland Marco Dela Paz
 ALIASES:

BackDoor-AMQ.dr (Mcafee)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Via email

This backdoor arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

It connects to a website to send and receive information.

It logs a user's keystrokes to steal information.

  TECHNICAL DETAILS

File Size:

49,152 bytes

Memory Resident:

Yes

Initial Samples Received Date:

28 Feb 2012

Payload:

Compromises system security

Arrival Details

This backdoor arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

Installation

This backdoor drops the following copies of itself into the affected system:

  • %System%:msjbvpncon.exe

(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.)

It adds the following mutexes to ensure that only one of its copies runs at any one time:

  • A^#KF&DFE

It injects codes into the following process(es):

  • explorer.exe

Autostart Technique

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\{9E41174A-B99F-F49D-5CD0-0EF87DF3A162}
StubPath = %System%:msjbvpncon.exe

Backdoor Routine

This backdoor connects to the following websites to send and receive information:

  • jp.{BLOCKED}rn.com

Information Theft

This backdoor logs a user's keystrokes to steal information.

Stolen Information

This backdoor saves the stolen information in the following file:

  • %System%:msjbvpncon

(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.)

NOTES:

It queries the default web browser by accessing the following registry entry:

HKEY_CLASSES_ROOT\http\shell\open\command

It then launches a hidden Web browser process (e.g. iexplore.exe) where this malware injects its code for its backdoor routines.

This backdoor has the following capabilities:

  • Capture screen shots, webcam, audio
  • Delete, search, and upload files
  • Download and inject remote codes to legitimate processes
  • Log keystrokes and active window
  • Manage processes and services
  • Modify and search the registry entries
  • Perform a shell command
  • Send system information (IP address, computer name, user name, operating system)
  • Update/Uninstall the malware
  • View and terminate active windows and ports

  SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

8.808.03

FIRST VSAPI PATTERN DATE:

28 Feb 2012

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 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\Active Setup\Installed Components
    • {9E41174A-B99F-F49D-5CD0-0EF87DF3A162}

Step 4

Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_POISON.RXPQ. 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.

NOTES:

To remove added Alternate Data Streams:

  1. Download Streams.exe (http://technet.microsoft.com/en-us/sysinternals/bb897440.aspx)
  2. Extract the contents of this file to a location of your choice.
  3. Open a command prompt window. Click Start > Run.
    • On Windows 98 and ME, type COMMAND, then press Enter.
    • On Windows NT, 2000, XP, and Server 2003, type CMD, then press Enter.
  4. In the command prompt, type the following, then press Enter: CD {Path where contents of downloaded file was extracted}
  5. Still in the command prompt type the following then press Enter:
    Streams.exe -d %System%:msjbvpncon
    Streams.exe -d %System%:msjbvpncon.exe
  6. Type exit then press enter.


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