JS_LOCKY.DLDSANH

 Analysis by: Robert Tacbad

 ALIASES:

JS/Dldr.Locky.71191 (Avira), JS/Locky.AT (F-Prot)

 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.

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

  TECHNICAL DETAILS

File Size:

53,617 bytes

File Type:

JS

Memory Resident:

No

Initial Samples Received Date:

25 Aug 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.

Download Routine

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

  • %User Temp%\uwOVIz54cwnFp
  • %User Temp%\uwOVIz54cwnFp.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.)

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

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}wang.name/467pbl
  • http://{BLOCKED}.{BLOCKED}.104.2/upp0nqa
  • http://www.sixpack.{BLOCKED}t.at/n93y3t
  • http://{BLOCKED}ron.ch/~se_robel/km51cbxx
  • http://www.{BLOCKED}ini.com/xkzd7c
  • http://{BLOCKED}.{BLOCKED}.249.203/data/info.php