JS_NEMUCOD.ELDSAUDV

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

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 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 arrives as an attachment to the following email messages spammed by other malware/grayware or malicious users:

• The malware arrives as an embedded file on a document:

  

Download Routine

This Trojan accesses the following websites to download files:

• http://disk.{BLOCKED}iongarden.com/js60.bin

It saves the files it downloads using the following names:

• %Application Data%\Microsoft\Windows\Templates\{random number}.exe

(Note: %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.

Other Details

This Trojan does the following:

• It does not proceed with its routine if the current year is not 2017.
• It queries the data of the registry entry HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\SystemRoot and uses the second character of this data for its decryption. The decryption will not work if the second character is not ":".