What Are Account Takeover (ATO) Attacks?

Account takeover is one of the top threats facing businesses today. Frequent incidents of data breaches, weak and recycled passwords, sophisticated attack techniques, and use of outdated defense mechanisms make ATO difficult to detect until significant damage is already done.

What is an account takeover (ATO) attack

Account takeover (ATO) attack is a type of identity theft where bad actors gain unauthorized access to genuine user accounts using stolen login credentials. They then exploit these compromised accounts to steal funds, make unauthorized purchases, abuse reward programs, phishing, and in worst cases, money laundering.

Why account takeover attacks are on the rise

Account takeover attacks continue to increase in a rapidly digitizing world. There are several reasons powering this rise, including:

• Weak/recycled passwords: With multiple digital accounts across websites and mobile apps, consumers create passwords they can easily remember. For instance, date of birth, anniversary, and commonly used words. However, these passwords are weak and easy to crack. Similarly, reusing or recycling passwords across accounts makes all the digital accounts vulnerable, should one account get compromised.

• Data breaches: Spillage of consumer data from frequent incidents of data beaches provides fraudsters with fresh databases of user credentials.

• Automation: Using bots, fraudsters can quickly achieve scale in phishing, credential stuffing, and log in attempts, boosting the success rates of these attacks.

• Generative AI: Emails, text messages, and deepfake videos created using generative AI appear more convincing, tricking people into sharing their sensitive details.

• Commoditized toolkits: It’s easier than ever to outsource crime-as-a-service or access criminal toolkits, expertise, and 24x7 support at nominal costs, enabling even wannabe fraudsters to launch sophisticated attacks with little-to-no technical expertise.

• Evading detection: Aware of the existing defense mechanisms, fraudsters use sophisticated evasion tactics, such as spoofing, VPN, TOR, device resets, and more to bypass security checks and evade detection.

• Outdated user authentication: Rather than protecting the business, legacy or obsolete fraud detection systems increase the risk of account takeover attacks. They add to the technical debt and make risk decisioning harder with disparate data sets.

• Insider threats: At times, disgruntled or greedy employees may reveal sensitive information to fraudsters in exchange for money.

What role do automation and generative AI play in ATO attacks

Today’s fraudsters are weaponizing automation and generative AI to launch complex and targeted account takeover attacks. Using these sophisticated tools, they create convincing email, text, and deepfake video messages for phishing campaigns that can even fool fraud fighters.

Worse still, fraudsters can simulate onboarding sessions and create forged documents in a few seconds.

Using bots, fraudsters automate credential testing that gets them valid username-password combinations in just a few minutes. They can then automate the login process to achieve scale. Intelligent and agentic bots make evasion easier with their abilities to mimic human behaviors and interact with defense mechanisms that require contextual interactions.

What industries are the popular targets for ATO attacks

Account takeover is an omnipresent challenge, affecting businesses across industries for the following reasons:

• Financial services: To steal funds and sensitive financial data, monetize gift cards, and money laundering.

• eCommerce: For unauthorized purchases and to access stored payment and personal details.

• Social platforms: For social engineering, spreading misinformation, impersonation.

• Telecommunications: SIM-swapping to intercept codes and bypass multi-factor authentication mechanisms.

• Enterprise services: To access intellectual property, pricing details, and other business-critical information.

How do ATO attacks impact businesses and consumers

Account takeover attacks can have a long-term impact on businesses and consumers.

Businesses not only face direct financial losses due to fraudulent transactions, stolen funds, and chargebacks, but also incur indirect costs on incident response, restoration of customer accounts, additional burden on customer service, regulatory penalties, and litigation costs. ATOs can disrupt operations, forcing business downtime for incident response and reallocation of resources. This operational disruption can cause delays, leading to customer dissatisfaction. Affected customers may choose to switch over to competitors, causing not just loss of business and revenue, but also brand equity and market reputation. Negative publicity can affect engagement with existing customers and adversely impact new customer acquisition. In the age of social media, negative comments from customers can damage trust in the business, thereby impacting investor confidence.

For consumers, ATOs bring financial losses in the form of stolen funds and unauthorized purchases. They risk being branded ‘suspicious’ and may even be blocked from future digital interactions. In addition, consumers may have to live through the trauma associated with the long-drawn process of recovering lost assets and re-establishing their digital identity.

What are the regulatory implications of ATO

Account Takeover (ATO) attacks trigger data breaches exposing businesses to regulatory implications. Regulations such as the GDPR and CCPA mandate implementation of safeguards and prompt communication to the authorities and the affected individuals in case of an incident. PCI-DSS mandates rigorous controls for payment data handling.

Highly regulated industries including financial services and healthcare, may face additional investigations by oversight bodies. If ATOs involve international access to customer records, data residency and cross-border rules may become applicable.

Failure to comply with the industry- and jurisdiction-specific regulations can lead to penalties, fines, and lawsuits.

What are the common techniques used in ATO attacks

The commonly used techniques fraudsters use in ATO attacks include:

• Credential Stuffing: Leverage large volumes of databases to automate login attempts in search of valid username-password combinations.

• Phishing/Social Engineering: Send emails or text messages to trick users into sharing their sensitive personal and financial details. Use Generative AI and deepfakes for targeted and more convincing messages.

• Brute Force Attacks: Try out a number of passwords successively until a matching password for a username is found.

• Session Hijacking: Steal session cookies or tokens to impersonate genuine users.

• SIM Swapping: Gain control of a user’s phone to intercept codes or exploit lacunae in MFA implementation to circumvent authentication checks.

• Malware: Install malware or keyloggers on a user’s device to capture key strokes and steal sensitive information.

How does an ATO attack play out

Beginning with target identification, fraudsters follow the steps described below to execute an ATO attack:

• Credential harvesting: Collect user credentials through data breaches, website scraping, social engineering, or purchasing databases from the dark web.

• Credential testing: Use credential stuffing or brute forcing to gather valid username-password combinations.

• Validation: Deploy bots to verify successful account access through login tests and small, unnoticeable transactions at scale.

• Establish persistence: Take control of the account by changing account details, adding their own details to lock the account owner out, or adding new devices.

• Lateral movement: Move between systems and users for extended attack opportunities.

• Monetization: Sell off username-password combinations or validated account access details, exploit compromised accounts to steal funds and make unauthorized transactions, or abuse the account for other fraudulent activities.

• Evasion: Clear logs, cover the trails, use proxy servers, or time the attack with low-vigilance periods to evade detection.

Why traditional fraud prevention fails to detect ATO attacks

The threat landscape has evolved faster than the traditional defense techniques have been able to keep pace. These obsolete techniques lack real-time risk assessment capabilities of dynamic user behaviors or evolving fraud tactics.

Additionally, because these legacy fraud prevention approaches rely primarily on static data points, such as passwords and IP addresses, they can be easily bypassed by a technically superior opponent and leave the business vulnerable to repeat attacks. Furthermore, being reactive, they come into play after an incident when the damage has already been done.

What are the indicators of an ATO attempt

Over the years, account takeover attacks have become challenging to detect. However, remaining vigilant about potential indicators, listed below, can help prevent ATO attempts:

• Logins from unusual locations or devices
• Multiple failed login attempts
• Changes to password or account settings
• Anomalous account behavior
• Sudden increase in traffic from VPNs or TOR

Key Takeaways

Account takeover attacks involve bad actors using stolen login credentials to gain unauthorized access to genuine user accounts.

Compromised accounts are used for unauthorized purchases, phishing, money laundering, and other criminal activities.

Weak and recycled passwords, automation, generative AI, and outdated user authentication are some factors contributing to the rise in ATO attacks.

Credential harvesting, testing, validation, and monetization are the key steps of an ATO attack.

ATO affects businesses across industries, causing financial, operational, and reputational damage.

How can businesses fortify their defenses

Protection from account takeover attacks requires strategic planning and a combination of technologies. To fortify defenses against ATO attempts, businesses must consider implementing:

• Multi-factor authentication (MFA): To add an extra layer of security for efficient access control.
• Rate limiting and CAPTCHA: To deter automated credential stuffing and brute forcing attacks.
• Device fingerprinting: To detect manipulated devices and trigger alerts for further investigation.
• Behavioral analytics: To detect and flag anomalous user behaviors.
• Bot management: To deter large-scale automated attacks.
• IP whitelisting: To prevent users from suspicious or spoofed IP addresses.
• Geolocation filtering: To review login attempts from suspicious locations.
• Continuous monitoring: To spot anomalous login patterns, changes to account settings, device resets etc.

Incident response plan: To ensure comprehensive response to an ATO attack from blocking suspicious accounts to maintaining account activity trails, recovery, communication to affected users and other stakeholders, and cooperating with law enforcement agencies.

Why trust Bureau for adaptive ATO prevention

Bureau’s integrated risk decisioning platform uses deep document verification, supplemented with device intelligence, behavioral biometrics, alternate data, and graph identity to analyze hundreds of risk signals in real-time and provide adaptive protection from evolving ATO attack tactics. With continuous monitoring, Bureau provides oversight of user activity to fortify every touchpoint without compromising user experience.

With easy integration through API or SDK, Bureau’s platform reduces deployment friction to deliver results from day one. Bureau empowers its partners with 24x7 support, actionable insights, and the latest threat intelligence to help them stay ahead of evolving ATO attack tactics.