Unknown attackers were able to access online accounts of HSBC Bank USA users in the first half of October, the bank told customers in a letter.
The data breach happened between October 4 and October 14, and prompted the United States subsidiary of UK-based HSBC to block access to online accounts, to prevent further unauthorized access, the letter the bank sent to customers (PDF) reveals.
“When HSBC discovered your online account was impacted, we suspended online access to prevent further unauthorized entry of your account. You may have received a call or email from us so we could help you change your online banking credentials and access your account,” HSBC explains.
The notice also reveals the large amount of data that was exposed to the attackers when they accessed the online accounts.
“The information that may have been accessed includes your full name, mailing address, phone number, email address, date of birth, account numbers, account types, account balances, transaction history, payee account information, and statement history where available,” the letter reads.
Following the incident, the bank also decided to enhance the authentication process for HSBC Personal Internet Banking with the addition of an extra layer of security. The organization is also providing impacted customers with credit monitoring and identity theft protection.
Impacted customers are also advised to monitor their accounts for any unauthorized activity and to contact the bank if they notice anything suspicious. They should also place a fraud alert on their credit files, so that creditors would contact them before making any new operation.
Periodically obtaining credit reports and informing law enforcement of any suspicious activity should also help the bank’s users avoid losses.
This data breach is not the first cyber incident involving HSBC. Last year, the bank’s users were targeted with fake security software, while in 2016 a crippling distributed denial of service (DDOS) attack knocked its systems offline for hours.