rundlll.dll - Winsock 2 LSP Spyware Trojan

This section describes a generic Winsock 2 LSP spyware trojan reported by McAfee. It uses a trojan file rundlll.dll to replace Microsoft mswsock.dll in the LSP registry entry.

When I was looking Winsock 2 LSP spyware trojan examples, I saw this one reported by McAfee at Here is a summary about this trojan.

Name: Generic LSP

Method of Infection: Double clicking malicious email attachments or malicious web page links.

Installer File - ucx.exe (18 KB, MD5: 2BD1D3C42EFC95CD5CEC4A7829E5EF9C): Added to the system folder temporary folders. It will be executed to make other changes to Windows systems.

LSP DLL File - rundlll.dll (102 KB, MD5: 7A3CF9893E1169AB37AEEF6DE10DC1EB): Added to the system folder. It will be used to replace mswsock.dll as the basic service provider in the LSP stack.

Registry Key Value: HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run - "remotecontrol"="C:\WINDOWS\system32\UCX.EXE": Added to run the trojan installer ucx.exe as a startup program.

Registry Key Value: HKLM\SYSTEM\CurrentControlSet\Services\WinSock2 \Parameters\Protocol_Catalog9\Catalog_Entries\000000000001 "PackedCatalogItem"=hex:43,3a,5c,57,49,4e,44,4f,57,53,5c,73,79,73,74,65,6d,33, 32,5c,72,75,6e,64,6c,6c,6c,2e,64,6c,6c,00,6c,00,00,00,...: Modified to link the Winsock 2 basic service provider entry to the trojan file, rundlll.dll. This entry was originally linked to Microsoft's mswsock.dll.

Table of Contents

 About This Book

 Introduction to Microsoft Windows

 Introduction to Windows Explorer

 Introduction to Internet Explorer

 "Paint" Program and Computer Graphics

 GIMP - GNU Image Manipulation Program

 JPEG Image File Format Quality and Size

 GIF Image File Format and Transparent Background

 "WinZip" - ZIP File Compression Tool

 "WinRAR" - RAR and ZIP File Compression Tool

 FTP Server, Client and Commands

 "FileZilla" - Free FTP Client and Server

 Web Server Log Files and Analysis Tool - "Analog"

 Spyware Adware Detection and Removal

 IE Addon Program Listing and Removal

 Vundo (VirtuMonde/VirtuMundo) - vtsts.dll Removal

 Trojan and Malware "Puper" Description and Removal

 VSToolbar (VSAdd-in.dll) - Description and Removal

 Spybot - Spyware Blocker, Detection and Removal

 Setting Up and Using Crossover Cable Network

 Home Network Gateway - DSL Modem/Wireless Router

 Windows Task Manager - The System Performance Tool

 "tasklist" Command Line Tool to List Process Information

 "msconfig" - System Configuration Tool

 Configuring and Managing System Services

 Windows Registry Key and Value Management Tools

 Startup Programs Removal for Better System Performance

Winsock - Windows Sockets API

 What is Winsock (Windows Socket) API?

 Winsock 2 API Architecture

 Winsock 2 SPI and LSP Layers

 mswsock.dll - Microsoft Windows Sockets 2.0 Service Provider

 "netsh winsock show catalog" - Showing Winsock 2 LSP

 Winsock 2 LSP and Spyware Trojans

rundlll.dll - Winsock 2 LSP Spyware Trojan

 Winsock 2 LSP Stack Registry Corruption

 LSP-Fix - LSP Stack Repair Tool

 Java on Windows

 Glossary of Terms

 Outdated Tutorials


 PDF Printing Version