update: to save reading this topic the executive summary: asdf.exe appears to be dropped onto c:\ by an exploit targetting firefox, at least old versions. The exploit will also attempt to run asdf.exe at which point asdf.exe tries to download more malware. The exploit appears to be delivered from one or more banner-ad companies of the type used by name-brand sites such as theonion.com. There is no firm evidence yet that it gets through firefox 1.0.6(en) although that is a possibility as nobody has offered an explanation of exactly how it gets through even older versions of firefox.
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