VBS_HOUSCORP.X

This worm 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 commands from a remote malicious user, effectively compromising the affected system.

Arrival Details

This worm 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.

Installation

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

• %User Temp%\{malware file name}.vbs

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)

Autostart Technique

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{malware file name} = "wscript.exe //B "%User Temp%\{malware file name}.vbs""

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
{malware file name} = "wscript.exe //B "%User Temp%\{malware file name}.vbs""

It drops the following file(s) in the Windows User Startup folder to enable its automatic execution at every system startup:

• %User Startup%\{malware file name}.vbs

(Note: %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup.)

Other System Modifications

This worm adds the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\{malware file name}

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\{malware file name}
(Default) = "{true or false} - {Date of execution}"

Propagation

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

• {Drive Letter}:\{malware file name}.vbs

Backdoor Routine

This worm executes the following commands from a remote malicious user:

• Execute itself
• Update itself
• Uninstall itself
• Download files
• Upload files
• View list of drives
• View list folder and files
• View list of processes
• Perform remote shell
• Delete folder and files
• Sleep
• Terminate itself

It connects to the following URL(s) to send and receive commands from a remote malicious user:

• http://{BLOCKED}ck.{BLOCKED}ip.biz:223/is-ready

Information Theft

This worm gathers the following data:

• User Name
• Host Name
• OS Version

NOTES:

This worm creates .LNK (shortcut) files using folder names found in removable drives. It then hides the original folder tricking users to click .LNK files. This .LNK files point out to a dropped copy of itself in the removable drive.

It checks if there is any anti-virus software installed in the system.

It does not have rootkit capabilities.

It does not exploit any vulnerability.