It is the MS Malicious Software Removal Tool which checks for and helps remove infections by specific, prevalent malicious software including Blaster, Sasser and Mydoom. When the detection and removal process is complete, the tool displays a report describing the outcome, including which, if any, malicious software was detected and removed. The tool creates a log file named mrt.log in the C:\Windows\debug folder.
Microsoft will release an updated version of this tool on the second Tuesday of each month.
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