Recently I got access to an encrypted wallet.dat which contains 4000 Bitcoins.
I hope you didn't pay for it. If you did, you have been scammed.
a fresh newbie account tries to tickle the whiskers of gullible people offering too much presumed value with hints of atleast 60% of the password
its already hinting its a russian email address so guessing the characters after the at and before the .ru becomes childs play of just probably 10 possible well know email provisors in russia
then the remaining characters are supposedly the characters before the @
it seem "to good to be true" offering something so easy to brute.. meaning.. IT IS not true
usually when these scams are done they are "sold" or insured by the guy wanting to brute pays the scammer asking if someone can brute..
end result the guy making the topic runs off with a the gullible persons donation