Yet another attack on Sony PlayStation Network took place, resulting in 100,000 yen (approximately $1,225) stolen from account holders.

The attack was discovered on May 18 after Sony received consumer complaints, but the hacking probably have taken place on May 16 and 17. So-net announced the latest intrusion on its home page in Japanese on Thursday.

The spokesman of So-net Entertainment Keisuke Watabe said, Although we can't completely rule out the possibility that there is a connection with the PSN issue, the likelihood is low. He says the unlikelihood is because of the differences in the methods of attacks.

Watabe claims that other accounts have not been hacked. At least there is no evidence of it. At this point in our investigations, we have not confirmed any data leakage. We have not found any sign of a possibility that a third party has obtained members' names, address, birth dates and phone numbers.

According to the Reuters, Security experts said Sony's networks around the world are still vulnerable to attack.

Series of security problems are expected to attract more attacks from hackers.

I think it's now 'I'm a hacker and I'm bored,' let's go after Sony, said Josh Shaul of a computer security firm Application Security Inc.