JS_NEMUCOD.ELDSAUEL

May 03, 2017
 Analysis by: Cris Nowell Pantanilla
 ALIASES:

TrojanDownloader:JS/Nemucod (Microsoft), JS/Kryptik.BEF (ESET-NOD32)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 REPORTED INFECTION:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Trojan executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

  TECHNICAL DETAILS

File Size:

143,164 bytes

File Type:

JS

Memory Resident:

No

Initial Samples Received Date:

21 Apr 2017

Arrival Details

This Trojan may be downloaded from the following remote sites:

  • http://{BLOCKED}desolucoes.com.br/SCANNED/YXT3512KCBOIYS/

Download Routine

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

  • http://{BLOCKED}eldwebdesign.com/b11289Ic/
  • http://{BLOCKED}ch4blogs.com/z11755iQ/
  • http://www.{BLOCKED}i-corruption.su/bCzs36201sB/
  • http://{BLOCKED}rnizacja.pdg.pl/zkl03/puCa08096nXgHH/
  • http://{BLOCKED}ardmccord.com/QiCJ27102PVsx/

It then executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

13.354.02

FIRST VSAPI PATTERN DATE:

21 Apr 2017

VSAPI OPR PATTERN File:

13.355.00

VSAPI OPR PATTERN Date:

22 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

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