Stealing from bank account

[BFK_GoNER]

Today, somebody called ricardo016 stole round $100.000 from my account and probably was intending to go on until i go totally bankrupt, but I logged off instantly. Can somebody explain if it's a cheat, an admin privellege or a common command (if so, why the hell is this allowed?!). The message looks something like this:

* ricardo016 stole $#### from your bank account ..

help me out plz, it's really frustrating 

thanks