Aha. Thanks much to Beth B, who pointed me at this page about the Gibe worm/Trojan. I had seen info at CERT about Gibe, but that made it sound like the point of Gibe was to run automatically when you received it, and didn't mention the whole Microsoft security angle. Okay, so Gibe is exactly what I received last night, so it's well-known, so I can stop wondering why nobody seems to have heard about it.
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