Modified by: Rika Joi Gregorio
 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This backdoor arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

  TECHNICAL DETAILS

File Size: 225,280 bytes
File Type: DLL
Memory Resident: Yes
Initial Samples Received Date: 20 Dec 2013

Arrival Details

This backdoor arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation

This backdoor drops and executes the following files:

  • %Application Data%\{BLOCKED}secfilepath\MsMpEng.exe
  • %Application Data%\{BLOCKED}secfilepath\mpsvc.dll

It creates the following folders:

  • %Application Data%\{BLOCKED}secfilepath

Other System Modifications

This backdoor adds the following registry keys:

HKEY_CLASSES_ROOT\MJ

It adds the following registry entries:

HKEY_CLASSES_ROOT\MJ
CLSID = "{random values}"

Other Details

This backdoor connects to the following possibly malicious URL:

  • http://{BLOCKED}.{BLOCKED}.225.28:443/update?id={ID}

NOTES:

It drops the following shortcut pointing to its dropped component in the %User Startup% folder to enable its automatic execution at every system startup:

  • %User Startup%\{BLOCKED}secfilepath.lnk - targets %Application Data%\{BLOCKED}secfilepath\MsMpEng.exe

  SOLUTION

Minimum Scan Engine: 9.700
FIRST VSAPI PATTERN FILE: 10.466.03
FIRST VSAPI PATTERN DATE: 11 Dec 2013
VSAPI OPR PATTERN File: 10.467.00
VSAPI OPR PATTERN Date: 12 Dec 2013

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

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_CLASSES_ROOT
    • MJ

Step 4

Search and delete these folders

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %Application Data%\{BLOCKED}secfilepath

Step 5

Search and delete this file

[ Learn More ]
There may be some 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.
  • %User Startup%\{BLOCKED}secfilepath.lnk

Step 6

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