Duqu is a sophisticated Trojan that seems to have been written by the same people who created the infamous Stuxnet worm.

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How does duqu delete itself?

I'm curious to know how Duqu deletes itself. From technical point of view and generally, how can an executable delete itself while is running? Does Duqu use a specific procedure to do this?
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How does duqu implement its dll files in PNF file format?

As you know files with PNF extension are associated with bitmap file type, from technically point of view how did authors of duqu implement this? as I concluded it is possible to make dlls in any ...