Online broker Robinhood has reported via a blog post a personal data breach occurred on November 3. The company said in a statement:
"An unauthorized third party obtained access to a limited amount of personal information for a portion of our customers."
Robinhood has said that social security numbers and bank card information have not been affected and that customers have not suffered any financial losses.
According to the company, attackers have used social engineering methods against a company support employee and gained access to some of the firm's systems.
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Robinhood has said unidentified individuals received a list of email addresses of approximately 5 million people and the full names of another group of approximately 2 million users.
Information from 310 other accounts has been compromised, including the users' name, date of birth and mailing address. The hackers received extensive account details from 10 users in this group.
Robinhood has said the attackers demanded a ransom after carrying out the attack.
The company has contacted law enforcement and is continuing to investigate the attack with the help of cybersecurity firm Mandiant.