There are relatively many cases of financial institutions being defrauded, but due to confidentiality and legal issues, the specific details are often not fully disclosed. However, there are some known cases that show how fraudsters carefully plan and implement their plans. Here are some typical case types: 1. **Social engineering attack**: Fraudsters trick bank employees or customers into providing sensitive information by pretending to be a trustworthy person or entity. A well-known case is the 2016 Bangladesh Central Bank theft, in which hackers obtained the bank's SWIFT system authentication information through social engineering techniques and stole more than $80 million. 2. **Fake loan application**: Fraudsters use forged documents and identity information to apply for bank loans to defraud funds. This type of fraud usually involves complex identity forgery and document tampering. 3. **Phishing**: Fraudsters deceive users into providing bank account information through fake emails or websites. This type of attack often involves large-scale mailings and carefully designed fake websites. 4. **Ponzi scam**: Use new investors' funds to pay old investors' profits, creating a false high return to attract more investment. Bernard Madoff's case is one of the most famous Ponzi schemes in history, and he used this method to defraud billions of dollars. 5. **Internal corruption**: Some fraud cases involve the participation of internal bank employees who may use their positions to commit theft or assist external fraudsters. For example, in some cases, bank employees may assist in money laundering or tampering with bank records. 6. **ATM and POS machine attacks**: Fraudsters install card readers and cameras on ATMs or POS machines to obtain users' bank card information and passwords, and then copy the cards for fraudulent use. This attack method is widely found around the world. 7. **Bill fraud**: Fraud using forged or altered bills to withdraw cash or goods from banks. This method requires a deep understanding of the bill process and rich forgery skills. Financial fraud not only harms the interests of financial institutions, but also affects the safety and trust of customers. Therefore, banks and regulators in various countries are strengthening internal controls and technical prevention measures to prevent these fraudulent activities.