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One of our companies server seems to have fallen victim to a php backdoor attack. I've managed to located and close several holes, but one seems to persist that is writing a php/webshell backdoor into our C:/windows/temp.

Microsoft Security Essentials seems to do a good job of detecting this threat and removing it before it can execute but the problem is I need to view the file security properties to see which app pool is creating these files (we have about 16 different sites on this server).

Does anyone know of a program/way that I can to monitor file writes to C:/windows/temp?

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2 Answers 2

up vote 2 down vote accepted

First:

You should restore from a known good backup. At the very least, scan the server offline using a rescue CD of some kind. With that out of the way...

Next:

Use Process Explorer to see deeply into process and file activity. You can also use security policy to audit filesystem access. However, since the server is compromised, I wouldn't trust anything that it tells me.

Nuke it from orbit! (Click the picture! You'll like it!)

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thanks, going to try the audit –  NSjonas Apr 11 '12 at 22:43

For the one-off answer, Microsoft Sysinternals Process Monitor will watch any file activity that you desire and a bit more.

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