JS_NEMUCOD.NAJ

May 02, 2016
 Analysis by: Janus Agcaoili
 ALIASES:

TrojanDownloader:JS/Nemucod.DS (Microsoft), Trojan-Downloader.JS.Nemucod (Ikarus), JS/Nemucod.eq (McAfee)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

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

  TECHNICAL DETAILS

File Size:

5,122 bytes

File Type:

JS

Memory Resident:

No

Initial Samples Received Date:

01 Apr 2016

Arrival Details

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}kspa.com/76g8h8y7

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

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

12.494.04

FIRST VSAPI PATTERN DATE:

28 Apr 2016

VSAPI OPR PATTERN File:

12.495.00

VSAPI OPR PATTERN Date:

29 Apr 2016

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.NAJ. 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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