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JS_NEMUCOD.THDBH

May 04, 2017
 Analysis by: Jennifer Gumban
 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Dropped by other malware, Downloaded from the Internet


This Trojan may arrive bundled with malware packages as a malware component. It may be hosted on a website and run when a user accesses the said website.

However, as of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size:

7,616 bytes

File Type:

JS

Memory Resident:

No

Initial Samples Received Date:

27 Apr 2017

Payload:

Connects to URLs/IPs, Downloads files

Arrival Details

This Trojan may arrive bundled with malware packages as a malware component.

It may be hosted on a website and run when a user accesses the said website.

Installation

This Trojan drops and executes the following files:

  • %Temp%\run.js

(Note: %Temp% is the Windows temporary folder, where it usually is C:\Windows\Temp on all Windows operating system versions.)

Download Routine

This Trojan connects to the following website(s) to download and execute a malicious file:

  • http://{BLOCKED}n.pl/file/get.vbn
  • http://{BLOCKED}n.pl/file/get.vbn

It saves the files it downloads using the following names:

  • %Temp%\tmp791236.513

(Note: %Temp% is the Windows temporary folder, where it usually is C:\Windows\Temp on all Windows operating system versions.)

Other Details

However, as of this writing, the said sites are inaccessible.

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

13.370.01

FIRST VSAPI PATTERN DATE:

26 Apr 2017

VSAPI OPR PATTERN File:

13.371.00

VSAPI OPR PATTERN Date:

27 Apr 2017

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

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

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.
  • %Temp%\tmp791236.513
  • %Temp%\run.js

Step 4

Scan your computer with your Trend Micro product to delete files detected as JS_NEMUCOD.THDBH. 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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