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BKDR_PLUGX.ANJ

December 06, 2014
 Analysis by: Jimelle Monteser
 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: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Dropped by other malware, Downloaded from the Internet


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. It may be dropped by other malware.

It does not have any propagation routine.

It executes commands from a remote malicious user, effectively compromising the affected system. It connects to a website to send and receive information.

  TECHNICAL DETAILS

File Size:

2,560 bytes

File Type:

DLL

Memory Resident:

Yes

Initial Samples Received Date:

14 Nov 2013

Payload:

Connects to URLs/IPs

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.

It may be dropped by the following malware:

  • TROJ_DROPPR.ANJ

Installation

This backdoor drops the following files:

  • %All Users%\DRM\Starter\otf - (contains encrypted stolen information)
  • %All Users%\DRM\Starter\xwdomupzndkunmavzq - (contains encrypted stolen information)

It creates the following folders:

  • %All Users%\DRM

It injects itself into the following processes as part of its memory residency routine:

  • svchost.exe

Propagation

This backdoor does not have any propagation routine.

Backdoor Routine

This backdoor executes the following commands from a remote malicious user:

  • Manage Files
  • Manage Directories
  • Get Drive Information
  • Perform Remote Shell
  • Screen Capture
  • Creates Process
  • Terminate Process
  • Get Adapters Information
  • Get System Information
  • Get OS Version
  • Get Module Information
  • Shut Down System
  • Manage Services
  • Manages Windows
  • Download Files
  • Upload Files
  • Get Computer Name
  • Get User Name
  • Get Host Name
  • Get Socket Name
  • Disables send/receive on a socket
  • Log Keystrokes
  • Manage Registries
  • Connects to SQL Data and Driver Source
  • Disconnects to SQL Data and Driver Source
  • Executes SQL Statement
  • Get SQL Data Sources
  • Get SQL Drivers

It connects to the following websites to send and receive information:

  • japan.{BLOCKED}ecovery.net:8000

Other Details

This backdoor requires the existence of the following files to properly run:

  • {malware path}\starter.exe
  • {malware path}\splash_screen.dll.sp1

NOTES:

It does not have rootkit capabilities.

It does not exploit any vulnerability.

  SOLUTION

Minimum Scan Engine:

9.700

FIRST VSAPI PATTERN FILE:

10.420.05

FIRST VSAPI PATTERN DATE:

19 Nov 2013

VSAPI OPR PATTERN File:

10.421.00

VSAPI OPR PATTERN Date:

20 Nov 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

Remove the malware/grayware file that dropped/downloaded BKDR_PLUGX.ANJ. (Note: Please skip this step if the threat(s) listed below have already been removed.)

Step 3

Restart in Safe Mode

[ Learn More ]

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.
  • %All Users%\DRM

Step 5

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