What is it?
ADW_SCANPORTAL.A - MWSVM.EXE, IEASST.DLL, MWSVM.OCX

What does it do?
This adware program downloads updates of itself from specified Internet addresses listed in its body. It also downloads ads and displays them as popups in the system.

This adware also downloads data from advertisements and saves them its log files. It also changes the Internet Explorer search assistant.

Removal:
Trend Micro has the full dirt ( HERE )