Malware Redirects Browser or Blocks Internet Connectivity

This post was written by admin on February 16, 2009
Posted Under: Browser Hijack, Free PC Security

Update December 2009: Many rogue applications are installing rootkits which block security applications, please read this article on Removing Malware

Click here for Browser Hijacks and Redirects - Added December 2009

Many of the malware variants have been modified with search engine / browser redirects which prevents users from downloading antimalware solutions or updating their current security programs.

In many instances users find that they are blocked from reaching the download sites completely.

In most cases users can find a modified file in the system32 folder:

C:Windowssystem32wdmaud.sys
C:Windowssystem32sysaudio.sys

These files are also legitimate Windows files and should be located in C:WindowsSystem32drivers

Users can right click the file in system32drivers and click on Properties, the genuine versions are signed by Microsoft.

sysaudio is around 60kb and wdmaud is 80kb

Those found in system32 are usually around 14kb and should be deleted, but care should also be taken to ensure that ONLY the 'sys' files found in system32 are removed as others with the same name have different file extensions and are part of the Operating System.

This is also something that the Conficker/Downadup worm does, click the link for more information and also Trojan.TDSServ which can be removed with TDSS Removal Tool

I have also included this video below to guide you through the steps to finding the rogue files if they exist and this will show you the genuine versions.

If your browser is being redirected to sites other than the intended site you were looking for please go to the following link and watch the first video:
Rename Exe Files
Browser Hijacks and Redirects

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