before the 3.56 update people would load a program onto the ps3 that would crack people's passwords. I won't name this program... but brute is the beginning of the program. What this program did, and it might have taken days to do it, but it would sit there for hours and even days as long as you left your psn account online and crack your password. It was often someone on your friends list doing it also, because your friends list is the only way that someone would be able to access your ps3 unless they have your ip address.
The Easter Bunny is real.
I know i'm late to reply, but it wasn't a hack, your brother gave the guy your account info. if it was a hack, the guy would of been able to get into the account without any info needed. he would just use hacking software and break into your system through the network/internet.