Why Nigerian banks cannot wait to modernise fraud detection
Article
Nigerian banks lost N52.26 billion to fraud in 2024, nearly triple the prior year, even as the number of reported attacks fell. This piece explains why legacy, rule-based detection can no longer keep pace, and what core banking infrastructure leaders need to put in place over the next 12 months.
Why legacy systems are failing
Most Nigerian banks are still using fraud detection systems built on rules: flag a transaction if it exceeds a certain amount, if it originates from an unusual location, if it happens outside normal hours. These systems were designed for a different era of fraud. They cannot keep pace with the sophisticated, AI-powered attacks that are now driving the bulk of fraud losses across African financial services. Rule-based systems have two critical failures. First, they cannot adapt to new fraud patterns without manual human intervention. Recognising a new attack pattern, understanding it, writing a rule to catch it, and deploying that rule typically takes weeks. But fraudsters using fraud-as-a-service toolkits, available on dark web marketplaces, can change their tactics within days. This gap is where fraudsters operate with impunity. Second, they produce high rates of false positives. Every false positive blocks or delays a legitimate customer's transaction. At scale, this creates operational burden for your fraud team and material damage to customer experience. In a market where customers are evaluating whether digital banking is trustworthy, false positives undermine adoption. According to Veriff's Future of Finance Report, one in every 20 verification attempts is now deemed fraudulent. For a Nigerian bank onboarding new customers at scale, this means synthetic identity fraud is becoming a routine problem, not an edge case.The new threats facing Nigerian banks
In Nigeria, the scale of the problem is already evident.Synthetic identity fraud
According to the NIBSS Industry Fraud Desk Report (2023), identity-related fraud cases on digital banking platforms in Nigeria rose by 245% between 2020 and 2023, with the highest number of reported cases involving digital payment providers. Major Nigerian fintech platforms like OPay, with over 40 million registered users and billions of naira in daily transactions, have become victims of ongoing synthetic identity fraud enabled by AI-generated deepfakes, falsified national identification documents, and liveness-detection bypass methods that compromise Know Your Customer (KYC) and real-time transaction authentication systems. The global picture reinforces the urgency. Global fraud losses reached USD 442 billion in 2025 alone, according to the INTERPOL Global Financial Fraud Threat Assessment. What makes this particularly dangerous for Nigerian banks is that 95% of synthetic identities are not detected during the onboarding process at financial institutions. If your institution is relying on manual review or basic document checks, most synthetic identities will pass.Account takeover at scale
Account takeover fraud surged 122% year-on-year in 2025. The combination of Nigeria's high mobile banking penetration and AI-powered social engineering creates an acute vulnerability. A fraudster can compromise an account and move funds before your detection system flags it.Fraud-as-a-service
The democratisation of fraud tools is accelerating attacks. Dark web marketplaces now offer packaged fraud kits for:- Business email compromise
- Account takeover
- Synthetic identity creation
- Phishing