I analyzed some details with the Bot developer and seems like one more Bot that I downloaded 15 mins before DiceBot from Blog, http://primedicebot.blogspot.com/

That blog must not be used and it is the real culprit. It gives pm.zip file

When I tried, nothing happened in bidding so I stopped it and used DiceBot.exe

Seems like the real scammer is pm.zip on the Blog Ultimate PrimeDice Bot 4.0 .... it in fact might have stolen almost $67 in BTC

I have no idea what is the exact reason, but I have learned my lesson. Never use a Bot (atleast unknown ones) .. Lesson learnt

Thanks to Eugene for looking at email details

Thanks all and be careful.