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VBS_NEMUCOD.SDV

January 21, 2017
 Analysis by: RonJay Kristoffer Caragay
 ALIASES:

VBS/Downloader.eh (McAfee); HEUR:Trojan.Script.Agent.gen (Kaspersky)

 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:

19,848 bytes

File Type:

VBS

Initial Samples Received Date:

20 Jan 2017

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 Profile%\45x

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)

Download Routine

This Trojan saves the files it downloads using the following names:

  • %User Profile%\gt.zip

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}vx.net/log2.php?logins=0a
  • http://{BLOCKED}vx.net/log2.php?logins=did&s=b
  • http://{BLOCKED}vx.net/log2.php?logins=did&s=ok
  • http://[BLOCKED}e.googleapis.com/zeusthor/gt15

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