A user signs up on your platform. Their details check out, and the KYC check passes without friction. Over time, they transact in predictable amounts, following a consistent pattern.

Two months later, you spot unusual activity: a new device login, a sudden spike in transactions, and funds moved out in quick succession. This is abnormal for a user who typically operates within a stable range. Before your team can investigate or trace the activity, the user reports that funds are missing.

This is a typical case of account takeover fraud.

Account takeover fraud happens when a fraudster gains control of a legitimate user’s account using tactics like stolen credentials, SIM swaps, or social engineering. In 2024, 83 percent of organizations globally experienced at least one account takeover incident, showing how widespread and damaging the threat has become.

Drawn from expert insights, this article breaks down what account takeover fraud looks like on fintech platforms, specific patterns to watch for, and practical ways to detect and prevent ATO before it leads to losses on your platform.

What Account Takeover Fraud in Africa Looks Like in Practice

Most account takeover fraud attacks don’t start with sophisticated hacks; they begin with small access points that escalate quickly once a fraudster gains control. This is what ATO looks like in practice across African fintech platforms today.

• SIM swap takeovers
  A customer loses network access when their phone number is ported to a new SIM. Within hours, the fraudster receives SMS OTPs, resets passwords, and logs in from a new device. Funds are moved before the user contacts support—a pattern common in Nigeria and Kenya, where telecom controls remain weak.
• Credential stuffing from data breaches
  Fraudsters use leaked login credentials from other platforms, such as e-commerce sites or social apps. They test the same email/password combinations on fintech apps, exploiting reused credentials. Successful logins often appear legitimate and bypass basic alerts.
• Social engineering targeting support teams
  Instead of attacking the app, fraudsters target people. They call customer support, pretending to be the user, claim they’ve lost access, and pressure agents to reset credentials. Where identity verification during support interactions is weak, one convincing call is enough to hand over the account.
• Phishing scams targeting users
  Emails or SMS messages mimicking legitimate fintech alerts lure users into verifying accounts or resetting passwords. Clicking a link can redirect them to fake logins or install malware that captures credentials. With these details, accounts are accessed without immediate alerts.

Bolaji Jimoh, Fraud Manager at Dojah, notes that while account takeover fraud affects banks and fintechs alike, emerging fintechs are often targeted first because their fraud defense systems are not fully developed.

 He adds that organised fraud rings routinely test these platforms for weaknesses, using leaked or resold email lists—sometimes sourced through insiders or third-party data sellers to launch credential-based ATO attacks. 
 

Download the Dojah Fraud Insight Report to find out more about emerging fraud trends in Africa

Warning Signs of Account Takeover Fraud

Account takeover fraud usually leaves clear signals if you know where to look. Here are key warning signs to watch for on your platform, especially within African fintech environments:

1. SIM swap indicators

A user changes their phone number and logs in from a new device within 24 hours. Almost immediately, you see multiple OTP requests as the original user tries to regain access. When these events happen together on your platform, it often points to a SIM swap and a loss of account control.

2. Cross-border login anomalies

 A user who has always accessed your platform from Nigeria suddenly logs in from the UAE or Ghana. While legitimate travel is common, this pattern frequently appears in account takeover cases. The key is not to auto-block, but to flag the session for review, especially if other risk signals follow.

3. P2P transfer velocity spikes

A user who typically sends ₦10,000 a month suddenly moves ₦500,000 within 24 hours. The funds are often split across multiple new beneficiaries in rapid succession. This kind of behavior is designed to drain the account before alerts are raised.

4. Dormant account reactivation

An account that has been inactive for 90 days suddenly logs in and attempts a high-value withdrawal. In many cases, the credentials were compromised or sold during the inactive period. These accounts are targeted because they’re less closely monitored.

5. Beneficiary churn after login

Immediately after access, withdrawal, or transfer, beneficiaries are changed on a user account. New recipients are added, and funds are redirected away from familiar destinations. This is a classic account takeover move once control is secured.

5 Steps to Prevent Account Takeover (ATO) Fraud in 2026

Knowing what account takeover fraud looks like is not enough. To stop it, you need clear and enforceable steps you can implement before attackers change account details or move funds on your platform.

Bolaji offers an expert perspective on practical ways fintechs can detect and prevent ATO in real time:

1. Trigger Step-Up Verification at High-Risk Moments

Most account takeover incidents happen when attackers attempt to change account details or move money during high-risk moments.

A high-risk moment is any action that deviates from a user’s normal behavior and increases the likelihood of financial loss. These moments should be flagged immediately and met with additional verification.

High-risk moments to watch out for include:

• Phone number change followed by a withdrawal request within 24 hours
• Log in from a new device, followed by a beneficiary change
• First transaction after 90+ days of account inactivity

At these moments, it is important to apply step-up tactics that can slow down or stop attackers before funds leave the account.

Step-up tactics include:

• Email-based secondary authentication: Email is often harder to compromise than SIM-based channels
• Transaction delay: Hold high-value transfers for 24 hours when multiple risk signals appear

With these adjusted rules in place, attackers cannot move funds immediately, even when credentials have already been compromised. 

2. Monitor Transactions for Account Takeover Fraud Patterns

Account takeover fraud often shows up through abnormal transaction behavior rather than failed logins.

Transaction monitoring helps you spot attackers by how they move money and how quickly they act after gaining access. It also allows you to adjust rules and set thresholds that flag suspicious activity in real time.

What to track:

• Velocity abuse: Funds moved faster than the user’s historical behavior
• Beneficiary changes: New recipients added immediately after login
• Circular transfers: Funds sent across multiple accounts and routed back as a layering tactic

Threshold examples for your fintech:

• Flag if a P2P transfer is more than three times the user’s average transaction size
• Alert if more than five new beneficiaries are added within 24 hours
• Block withdrawals to a new beneficiary within one hour of a device change

These rules reduce false positives, help teams focus on high-risk activity, and prevent account takeover fraud before funds are lost. Tools like EasyDetect make transaction monitoring simple by automatically detecting unusual patterns and alerting your team before funds are lost.

3. Use Behavioral Monitoring to Detect Account Takeover Fraud Early

Instead of relying only on static rules, behavioral monitoring focuses on how users normally behave and flags deviations in real time.

This approach helps identify compromised accounts even when attackers use valid credentials.

Behavioral signals to monitor include:

• Sudden changes in login time, location, or session duration
• Unusual sequences of actions, such as a login followed immediately by beneficiary edits
• Transaction behavior that does not match the user’s historical patterns

By continuously comparing current behavior against past behavior, fintechs can detect account takeovers early and intervene before transactions are completed. You can use advanced monitoring tools like Profiled Risk to continuously compare current behavior against historical patterns and highlight high-risk accounts.

4. Go Beyond SMS OTP with Biometrics and Liveness Detection

Relying on SMS OTPs or basic two-factor authentication is no longer effective against modern ATO attacks.

Biometrics, device fingerprinting, and liveness detection add stronger layers of verification, especially during sensitive actions. Periodic biometric checks during sessions and at login help confirm that the real account owner is still in control.

This is particularly important for high-value transactions and withdrawals, where the cost of fraud is highest.

As risk increases across sessions and account changes, stronger verification can be triggered automatically to prevent unauthorized access.  Enhanced identity check tools like  EasyOnboard validate identity in real time by combining face match and liveness checks.

5. Invest in Continuous Fraud Awareness Education

Technology alone is not enough to stop account takeover fraud. Founders, fraud leads, and risk teams must continuously educate users about common attack methods and warning signs.

When your users understand how fraud works, they are less likely to fall victim to social engineering or credential compromise.

Ways to educate users include:

• In-app alerts warning against sharing OTPs or login details
• Email or SMS campaigns explaining common ATO tactics
• Simple onboarding messages highlighting safe account practices

Consistent fraud awareness education reduces user-driven risk and strengthens the effectiveness of your overall ATO prevention strategy. You can also leverage insights from the Dojah blog to share practical fraud prevention tips with users and staff.

Dojah: Your Fraud Prevention Partner Against Account Takeover Fraud

As fintech adoption grows across Africa, both early-stage fintechs and established banks are increasingly targeted by fraud rings exploiting weak fraud defenses. Preventing ATO today requires continuous monitoring of user behavior and transactions. You need to upgrade your fraud prevention stack beyond basic KYC checks to truly secure your platform.

Dojah helps African fintechs move beyond basic KYC into active fraud prevention. By combining behavioral risk profiling, transaction monitoring, and biometric verification, Dojah enables teams to detect account takeover attempts as they unfold in real time.

If you want to see how Dojah can help protect your platform against account takeover fraud, reach out to our team today.

FAQs on Account Takeover Fraud in Africa

1. What is account takeover fraud in fintech?
Account takeover fraud happens when criminals gain unauthorized access to user accounts and perform fraudulent transactions. Common methods include SIM swaps, credential stuffing, and social engineering.

2. Why is ATO increasing in African fintechs?
Weak telecom security, SMS-based OTPs, rapid user growth, and high P2P usage make African fintechs attractive targets for ATO attacks.

3. Can KYC alone prevent ATO?
No. KYC verifies identity only at onboarding. ATO happens after onboarding when fraudsters use valid credentials to access accounts.

4. How do fintechs detect ATO early?
Fintechs can spot ATO by monitoring device changes, unusual transaction patterns, beneficiary modifications, and evolving risk scores.

5. What’s the most common ATO method in Africa?
SIM swap attacks are the most common, where fraudsters port a user’s phone number to a new SIM and intercept OTPs.