WORM_MSIL.LTN

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

Arrival Details

This worm 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 files:

• %User Profile%\Templates\Tcpz-x86.sys
• {Malware Path}\MYSQL.DATA.DLL

(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.)

Autostart Technique

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
bootStart = "{Malware Path and Filename}"

It adds and runs the following services:

• Tcpz-x86

Other System Modifications

This worm adds the following registry keys:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Tcpz-x86

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Tcpz-x86
ImagePath = "%User Profile%\Templates\Tcpz-x86.sys"

Other Details

This worm connects to the following possibly malicious URL:

• http://{BLOCKED}.{BLOCKED}.134.99/gettcp.aspx?intTimes={number}
• http://{BLOCKED}i.{BLOCKED}4.info/gettcp.aspx?intTimes={number}