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BKDR_DARKMOON.DF

October 09, 2012
 Analysis by: Mark Joseph Manahan
 ALIASES:

Backdoor.Darkmoon.E (Symantec), Backdoor.Darkmoon (Sunbelt), W32/Poison.NCY!tr (Fortinet)

 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:

Dropped by other malware, Via email


This backdoor arrives as an attachment to email messages spammed by other malware/grayware or malicious users. 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 does not have any downloading capability.

It does not have any information-stealing capability.

  TECHNICAL DETAILS

Ports:

TCP Port 443

File Size:

49,152 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

14 Sep 2012

Payload:

Connects to URLs/IPs

Arrival Details

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

It may be dropped by other malware.

Installation

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

  • sgfrh8888

Propagation

This backdoor does not have any propagation routine.

Backdoor Routine

This backdoor opens the following ports:

  • 443

It executes the following commands from a remote malicious user:

  • Capture screen, audio, and webcam
  • Log keystrokes
  • List active ports
  • Manage open windows
  • Manage passwords
  • Manage registry, processes, services, devices, and installed applications
  • Perform multiple simultaneous transfers
  • Perform remote shell
  • Relay server
  • Search files
  • Share servers
  • Update, restart, terminates itself

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

  • {BLOCKED}k.{BLOCKED}e8000.com
  • {BLOCKED}k.{BLOCKED}e8000.com

Download Routine

This backdoor does not have any downloading capability.

Information Theft

This backdoor does not have any information-stealing capability.

NOTES:

It does not have rootkit capabilities.

It does not exploit any vulnerability.

  SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

9.396.01

FIRST VSAPI PATTERN DATE:

14 Sep 2012

VSAPI OPR PATTERN File:

9.397.00

VSAPI OPR PATTERN Date:

15 Sep 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

Identify and terminate files detected as BKDR_DARKMOON.DF

[ Learn More ]
  1. If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
  2. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

Step 3

Scan your computer with your Trend Micro product to delete files detected as BKDR_DARKMOON.DF. 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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