The fundamentals of bank cybersecurity are designed to address the most common attack vectors, including credential theft, exploitation of unpatched vulnerabilities, weak perimeter security controls, and unprotected endpoints and identities. These pillars include:

MFA everywhere

Repositories of leaked credentials and credential-stuffing bots have made passwords alone insufficient. Multi-factor authentication (MFA) is the first line of defense in identity protection. Microsoft estimates that MFA prevents 99.9% of phishing-based account takeovers. Banks must enforce MFA across online banking portals, internal tools, and administrative interfaces. Regulators such as the New York Department of Financial Services (NYDFS) require MFA to consist of at least two of three factors: knowledge (e.g., a PIN), possession (e.g., a hardware key or mobile authenticator app), and inherence (e.g., FaceID).   

Patch and update discipline

Financial institutions often manage a complex web of legacy infrastructure, including ATM networks and teller systems that run on specialized or outdated operating systems. These systems are prime targets for "jackpotting" attacks, where malware (such as Cobalt) is used to force an ATM to dispense its entire cash reserve at a specific time. Beyond these, teller desktops and internal servers must be kept up to date to close off known vulnerabilities.

The Federal Financial Institutions Examination Council (FFIEC) emphasizes that patch management is a core risk management function. Institutions must maintain an inventory of all hardware and software to ensure that when a vulnerability is announced (such as the recent "Citrix Bleed" or "Log4j" vulnerabilities), they can respond instantly. Patches should be prioritized by risk, mirrored in disaster recovery (DR) environments, and tested in non-production environments.

Strong endpoint security

From teller desktops to admin laptops, every bank endpoint is a bullseye for attackers. Using 'living off the land' tactics, hackers hijack legit tools like PowerShell and WMI to slip past antivirus defenses unnoticed.

Endpoint detection and response (EDR) provides device-level protection, going beyond signature-based detection to monitor behaviors. If unusual activity is detected, such as PowerShell trying to impair antivirus tools, EDR can respond to contain the attack.

Securing identities

With the shift toward cloud-first infrastructure, identity has replaced the traditional network perimeter as the primary initial attack vector. Identity threat detection and response (ITDR) monitors logins, permissions, and behaviors across both cloud and on-premises environments to catch intruders before they can do damage. ITDR can flag anomalous behavior such as "impossible travel" (logging in from two distant locations within a short period) and automatically revoke the user’s session token or force a password reset. 

Cloud security

Cloud adoption (like cloud services and SaaS)  has also magnified risks around user error, particularly with misconfigurations. According to Gartner, most cloud-related breaches are caused by customer error, for example, leaving cloud storage buckets publicly accessible.  Misconfigurations like this expose organizations to compliance violations and massive financial fraud. In banking environments, a single improperly configured storage bucket, exposed API, or overly permissive identity role can leak sensitive customer data and trigger regulatory penalties. Without continuous configuration monitoring and strict identity and access management (IAM) controls, small cloud errors can quickly escalate into large-scale breaches.

Banks must adopt a shared responsibility model. While cloud providers secure the infrastructure, the customer is responsible for the data, applications, and IAM settings within that infrastructure.

The digital interface between a financial institution and its customers is a prime target for attackers using automated bots to execute account takeovers or fraud. This is often accomplished through credential stuffing, where attackers use bots to test millions of stolen username/password combinations across different banking portals. This tactic capitalizes on the fact that most people reuse passwords. In 2020 alone, financial services organizations faced over 3.4 billion credential-stuffing attacks.

To combat this, institutions must implement secure authentication flows that go beyond basic passwords. This includes: 

• Bot detection: Identifying non-human traffic patterns and preventing automated login attempts.

• Device recognition: Flagging logins from unrecognized or "jailbroken" devices used to bypass security controls.

• Credential leakage monitoring: Cross-referencing user credentials against known databases of leaked passwords.

As hackers find ways around traditional fraud detection methods like transaction amount limits, banks are turning to behavioral biometrics, analyzing "digital body language." These tools monitor behaviors like typing speed, mouse path, and navigation patterns to detect whether a user is actually a bot, trained hacker, or a victim being coached by fraudsters.

Banks rely on APIs to connect with payment providers, mortgage lenders, and financial apps. However, these integrations are frequent targets, as a single vendor breach can open the door to dozens of downstream customers. Banks must adopt a "Zero-Trust" architecture for APIs, utilizing OAuth 2.0 for token-based access and ensuring that sensitive data is tokenized so that third parties never handle raw banking credentials.

Insider threats, whether malicious or unintentional, are particularly dangerous by nature. To minimize this risk, a bank’scybersecurity strategy should incorporate the principle of least privilege (PoLP), giving every user, application, and system only the minimum level of access necessary. Just-in-time (JIT) access can allow elevated privileges for a specific task and duration. These controls limit the amount of damage any one user can inflict.

Insider risk has grown with the shift toward hybrid offices. Banks must enforce remote work safeguards, including: 

• Managed device requirements: Only devices that are owned and secured by the bank should be allowed to connect to sensitive internal resources.   

• Geographic blocking: Restrict VPN connections to countries where the bank operates.

• Real-time monitoring: Analyze VPN logs for unusual activity using a SIEM.

As mentioned above, third-party vendors greatly expand banks’ attack surfaces. In addition to vetting vendors before onboarding, banks must adopt a model of continuous monitoring and limit third-party access to systems, while logging all activity for forensic review.

In the event of a cyber attack, a financial institution’s ability to respond quickly and effectively can be the difference between a minor incident and a catastrophic breach. A tested, practiced incident response (IR) plan is essential for containing incidents, restoring services, preserving customer trust, and maintaining compliance. Tabletop exercises can validate IR plans and train staff by simulating common scenarios like ransomware attacks. To satisfy regulators, plans should include processes for preserving forensic evidence and meeting notification requirements. 

In the high-stakes financial sector, mid-market and community banks face the same threats as leading global banks—with a fraction of the cybersecurity budget. For smaller institutions, building an internal 24/7 security operations center (SOC) isn’t feasible. That’s where Huntress comes in. Our Managed EDR, SIEM, and ITDR solutions protect your endpoints, identities, systems, and applications through the Managed Security Platform, backed by a round-the-clock, AI-assisted SOC for enterprise-grade security without the price tag. Explore Huntress today.