JS_DLOADR.SL

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.

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

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 connects to the following website(s) to download and execute a malicious file:

• http://{BLOCKED}t.northshoreweed.net/014.bin?KbQGLVP

It saves the files it downloads using the following names:

• %User Profile%\AppData\RoamingUoR78.exe

(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.)

Trend Micro detects the dowloaded file as:

• TSPY_URSNIF.YYSSL
  NOTE: The downloaded file may change depending on the server. As of this writing, this is the detection of the downloaded file.

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 does the following:

• The malware uses powershell commands in executing its malicious routine.

NOTES:

This malware arrives through a DOCX file. It is embedded and will execute its routine upon activation by the user:

Upon execution of this malicious embedded JS file, it displays the following message box to trick the user:

It does not have rootkit capabilities.

It does not exploit any vulnerability.