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JS_NEMUCOD.SMK10

October 20, 2016
 Analysis by: Francis Xavier Antazo
 ALIASES:

TrojanDownloader:JS/Nemucod (Microsoft); JS/TrojanDownloader.Nemucod.BBJ (ESET); Trojan-Downloader.JS.Agent.mpw (Kaspersky); JS.Downloader (Symantec);

 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.

  TECHNICAL DETAILS

File Size:

28525 bytes

File Type:

JS

Memory Resident:

Yes

Initial Samples Received Date:

27 Sep 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.

Installation

This Trojan drops the following files:

  • %User Temp%\{random file name}1
  • %User Temp%\{random file name}2
  • %User Temp%\{random file name}3
  • %User Temp%\{random file name}4

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}uzzuk.com/78hceef?rRffpf=NrdcbOsmH
  • http://{BLOCKED}rm.com/78hceef?rRffpf=NrdcbOsmH
  • http://{BLOCKED}rm.net/78hceef?rRffpf=NrdcbOsmH
  • http://{BLOCKED}oose.com/78hceef?rRffpf=NrdcbOsmH