Analysis by: Pearl Charlaine Espejo
ALIASES:

JS.Locky.IR (CAT-QuickHeal); JS/Locky.BE (Cyren); JS/TrojanDownloader.Nemucod.BLA (ESET-NOD32); Trojan-Ransom.Script.Locky (Ikarus); JS/Nemucod.pf (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 as an attachment to email messages spammed by other malware/grayware or malicious users. It 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: 10,085 bytes
File Type: JS
Initial Samples Received Date: 08 Nov 2016

Arrival Details

This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

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

Download Routine

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

  • %User Temp%\XYzu7xUSyO98.dll

(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}niew.friko.pl/tijwn65r
  • http://{BLOCKED}oauto.net/tmbqhc
  • http://{BLOCKED}n.nl/twtsp
  • http://{BLOCKED}age.com/3z2390i
  • http://{BLOCKED}hirk.net/4bkz3b