thank for the links and help guys!
it has started to make sense. like the anyalsis report says, it can be used for “keylogging” I’m sure it was sent to me for the same purpose. and I’m pleased with myself for knowing a bit about “extensions” and how something could be off about anything in files :p. but the fact remains on the ground that avast actually failed to detect it. I’d grown used to the idea that avast was the ans to my every soulution when it came to viruses and nasty stuff about them. but now, I think, I should do something more than leaving everything to avast alone. :-\