Have a look at the VIL information on the threat: http://vil.nai.com/vil/content/v_141387.htm
You will often see this detection on USB keys that are taken home and plugged into infected home pc's, and then returned to work and plugged in.
The USB key will also often contain malware that probably won't be run unless directly executed.
Yes, I have referred to the VIL information page and it looks reasonable. However, the Trojan Generic!atr is still being detected by McAfee VirusScan even reformatted the removable drive.
Detection only happen in OnAccessScan.
Is that possible? Can I have your advice on how to trace the source of threat?
It was found detected in \Device\Harddisk2\DP(1)0-0+6\AutoRun.inf
I don't think this is a false positive issue. A freshly formatted USB key should not have an autorun.inf on it - and in a majority of cases, USB keys shouldn't have autoruns on them anyway.
I believe you need to investigate this as a potential undetected virus issue to remove that as a possibility. You need to find a pc that you know to be clean, turn on "View all files" in Explorer and find out if there are any executables lurking on that drive.I'd also recommend disabling autorun as well on that computer before plugging the drive in.
Marking as 'assumed answered' due to age of thread. If you need any further assistance please don't hesitate to let us know.