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And now on to our article…
After spending nearly a week on & off removing a virus from a notebook computer, we are down to one last task… getting the network services back online. Here are some notes about how to get around this problem and the ever-present “acquiring network address” that never is acquired.
Resetting Windows Network Stacks
- To reset the Windows/XP TCP/IP stack use this command from the command shell:
netsh int ip reset reset.log
- To reset the Windows/XP Socket layer, use this command from the command shell:
netsh winsock reset catalog
Check For Rootkits
Turns out the virus installed a rootkit. These are special files hidden by the operating system that change how the base OS works. That makes them hard to detect & remove with normal spyware. TDSS rootkit by Kapersky Labs helps fix that:
- Download install and run TDSS rootkit removing tool – get it here:
In our case the file c:\WINDOWS\system32\DRIVERS\isapnp.sys was compromised. You can repair this with a Windows XP recovery (sometimes) by following these instructions : http://support.microsoft.com/kb/315311.
- Download, install, and run Combo-Fix. Before you do this you must SAVE LINK AS and rename the file from ComboFix to Combo-Fix during the download, NOT AFTER:
In our case Combo-Fix also found problems with:
- c:\windows\Copy of notepad.exe