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rootkit signature C:\windows\temp\Perflib_Perfdata_*.dat?

I am concerned about temporary files that appear in the Windows temp directory. Have seen many people asking about the Perflib_Perfdata_*.dat files in various forums on the net. The standard answer is that it is a file connected with Windows Performance Monitor. But that file is supposed to appear in the Windows system directory. Why is it appearing it the temp directory?

I know I had a rootkit infection on a computer where this file was appearing. Rootkit revealed by rootkitrevealer. Great software by the way.

Of course, not sure that it was the rootkit creating the file, but I suspect it was. Never could remove the infection or even find out its name. It seemed to have taken over the InstallShield directory in Program Files\Common. Could not examine the directory or delete it by any means. Ended up reformatting and reinstalling to remove the rootkit.

Have a friends computer that I brought some files over to on a disk. Now Perflib_Perfdata_*.dat files are appearing on that computer.

Does anyone know why? Please don't automatically answer ''Performance Monitor'' since malware could be hiding under an assumed name.

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