VBS_DUNIHI.KC

This Trojan arrives via removable drives. 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 connects to certain websites to send and receive information.

Arrival Details

This Trojan arrives via removable drives.

It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation

This Trojan drops the following copies of itself into the affected system and executes them:

• %Application Data%\Microsoft Office\Microsoft Excel.WsF

(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 creates the following folders:

• %Application Data%\Microsoft Office

(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.)

Autostart Technique

This Trojan adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Microsoft Excel = "wscript.exe //D "%Application Data%\Microsoft Office\Microsoft Excel.WsF""

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
Microsoft Excel = "wscript.exe //D "%Application Data%\Microsoft Office\Microsoft Excel.WsF""

Propagation

This Trojan drops the following copy(ies) of itself in all removable drives:

• Microsoft Excel.WsF

Other Details

This Trojan connects to the following website to send and receive information:

• http://maroco.{BLOCKED}pc.net:866
• http://maroco.{BLOCKED}see.com:866
• http://maroco.{BLOCKED}rectme.net:866

It does the following:

• It drops copies of itself in removable drives. It then searches for files and folders in the target drive. It creates shortcut files to point to the copy of itself using the searched names. Once created, it will hide the original files and folders. As a result, the dropped copy will execute whenever a shortcut is opened.