JS_NEMUCOD.AUF

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. As of this writing, the said sites are inaccessible.

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.

This malware arrives via the following means:

• Embedded in Microsoft Word Documents

Download Routine

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

• http://analytic.{BLOCKED}horeweed.info/stat.php

It saves the files it downloads using the following names:

• %User Profile%\Templates\{random numbers}.exe -> on Windows XP and below
• %Application Data%\Microsoft\Windows\Templates\{random numbers}.exe -> on Windows Vista and above

(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.. %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming 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.

As of this writing, the said sites are inaccessible.

NOTES:

This malware arrives as an embedded file on a Word Document file. It will execute its routine upon activation by the user:

It does not have rootkit capabilities.

It does not exploit any vulnerability.