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BKDR_DEMTRANC.DK

October 09, 2012
 Analysis by: Karl Dominguez
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW


This backdoor gathers certain system information. It also has capabilities such as downloading and executing files and executing arbitrary commands.

This backdoor may be dropped by other malware.

  TECHNICAL DETAILS

Ports:

TCP Port 443

File Size:

38,400 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

19 Sep 2011

Payload:

Compromises system security, Steals information

Arrival Details

This backdoor may be dropped by the following malware:

  • TROJ_DROPPER.QUB

Backdoor Routine

This backdoor opens the following ports:

  • Port 443

NOTES:

It gathers the following system information:

  • Computer name
  • IP address
  • Operating system version
  • Proxy server
  • System directory
  • User name

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

  • {BLOCKED}.{BLOCKED}8.159.12

This backdoor has the following capabilities:

  • Download and execute other files
  • Execute arbitrary commands

  SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

8.438.08

FIRST VSAPI PATTERN DATE:

19 Sep 2011

VSAPI OPR PATTERN File:

8.439.00

VSAPI OPR PATTERN Date:

20 Sep 2011

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

Remove the malware/grayware file that dropped/downloaded BKDR_DEMTRANC.DK

Step 3

Identify and terminate files detected as BKDR_DEMTRANC.DK

[ 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 4

Scan your computer with your Trend Micro product to delete files detected as BKDR_DEMTRANC.DK. 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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