To ensure the secure use of financial services, Woori Bank Vietnam provides the following mandatory security guidelines and incident response instructions for using internet and mobile banking services..

1. Installation and Usage Instructions

  • Download the Woori WON Banking app only from official app stores (Google Play, Apple App Store).
  • Keep your app updated regularly to ensure the latest security features are applied.
  • For instructions, refer to Woori Bank Vietnam official website > Retail/Corporate > Internet/Mobile Banking Guide.
  • When accessing Internet Banking, secure communication (SSL/TLS) is applied to protect your personal information. Please make sure that the address bar begins with “https://” and that a padlock (🔒) icon is displayed.

2. Do Not Share Your Password, PIN, or OTP

  • Never share your password, PIN, or OTP with anyone under any circumstances.
  • Do not save your credentials in notes, browsers, or on your phone.
  • Woori Bank will never request your authentication information via any communication channel.

3. Set Strong Passwords and Update Them Regularly

  • Use a combination of uppercase/lowercase letters, numbers, and special characters with a minimum of 8 characters.
  • Avoid using personal information (e.g. birthdate, phone number, repeated patterns).
  • Change your password and PIN at least once every 3 months.

4. Do Not Use Public Computers or Public Wi-Fi

  • Avoid using internet/mobile banking on public computers or networks (e.g. cafés, airports, internet cafés).
  • Only use secure personal devices and trusted networks.

5. Do Not Save Login Information & Always Log Out

  • Disable browser or app features that store your ID or password automatically.
  • Always log out and close the browser or app after completing your session.
  • If there is no activity for a certain period of time, the system will automatically log you out to securely end your session.

6. Beware of Fraudulent Websites and Fake Apps

  • The Woori WON Banking app is only available through official app stores.
  • Never click on links or install apps sent via unknown messages, SMS, or social media.
  • If you suspect a fake app or phishing site, report it to the customer center immediately.

7. Keep Security Software Up to Date

  • Ensure your device’s operating system and banking app are always up to date.
  • Install reliable antivirus/malware protection and perform regular scans.

8. Choose Secure Authentication Methods

  • Woori Bank offers OTP, biometric authentication, and secure passwords.
  • Choose a strong authentication method suitable for your transaction amount and importance.

9. Be Aware of Security Risks

  • Cyber threats such as phishing, hacking, and smishing are increasing.
  • If you receive suspicious messages or notice unauthorized activity, stop usage and report it immediately.

10. Do Not Use Rooted or Jailbroken Devices

  • Do not use Woori WON Banking on rooted (Android) or jailbroken (iOS) devices.
  • Never install apps from unofficial sources or untrusted websites.

11. Report Suspicious Transactions Immediately

  • If you receive OTP requests, transaction alerts, or login attempts you did not initiate, stop activity and contact us immediately.

12. Report Lost or Damaged OTP Devices or Authentication Tools

  • If your OTP generator, security card, registered phone number, or certificate is lost or damaged, notify us immediately.
  • If you suspect any fraud or hacking, please report it without delay.

13. How to Report Incidents or Contact Us

14. Official Communication Channels

Woori Bank Vietnam will only contact customers through the following official channels:

  • SMS to your registered mobile number
  • Push notifications via Woori WON Banking App
  • Emails sent to your registered email address
  • Notices via our official website and mobile app

⚠️ Woori Bank never requests sensitive information such as passwords, PINs, or OTPs. If such a request is received, treat it as fraud and report it immediately.