There is no log generated as it just replaces the MBR and nothing else

Did you read this page ? http://www2.gmer.net/mbr/

So it seems that the cat's out of the bag already, running rampant in the wild, and it's now time to provide full documentation and op instructions for everyone to read! Otherwise expect an increasing stream of complaints and queries about it.

This programme has been out now for many years and you are the first I have come across that has voiced any concerns about it. As for running rampant I fail to follow you - this is a tool used in malware removal forums by people who know what it does, and when to use it. If you had concerns at the time why did you not ask the person helping you