Security

Financial Services Organizations Need to Know About Advanced Persistent Threats

These long-term attacks pose significant risk to banks, insurers and capital markets firms already targeted by ransomware and fraud.

BizTech Staff

At this point, financial services organizations are more than familiar with ransomware, fraud schemes and nation-state cyber activity. For banks, credit unions, insurers and investment firms, it’s not a matter of if but when. IT leaders are expected to stay vigilant while strengthening operational and cyber resilience in a highly regulated environment.

But what happens when an attack isn’t a quick strike?

What happens when a malicious actor gains entry into your environment through stolen credentials, a compromised third-party vendor, a zero-day vulnerability or a cloud misconfiguration and remains undetected? After striking once, what happens if they retain access and strike again?

These are advanced persistent threats (APTs). Once inside, threat actors often “live off the land” for as long as possible — a period known as dwell time — quietly studying systems, mapping privileged access and monitoring transaction workflows. They also identify high-value data such as account information, trading systems, payment platforms and proprietary financial models.

Here’s what financial services IT leaders should know about these low and slow attacks, especially as digital banking, open finance ecosystems and hybrid cloud environments expand the threat surface.

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From the ’80s to Now: The Evolution of Trust-Based Attacks

Financial services organizations have long been a prime target for cybercrime because they represent direct monetary gain. Early attacks exploited trust in physical and digital systems alike. Today’s APTs exploit something even more complex: digital trust.

When we think about defending against cyberattacks, we often picture perimeter defenses — firewalls, endpoint protection and network segmentation. But APTs challenge that mindset. They bypass the perimeter using legitimate credentials, social engineering, compromised APIs or trusted third-party connections.

In financial services, trust is foundational. Customers trust institutions with their money and data. Employees trust internal communications and workflows. Institutions trust partners, fintech integrations and vendors.

Threat actors know this, and they exploit it.

Cybersecurity awareness training in financial services must evolve accordingly. Traditional phishing simulations are no longer enough. Role-based security training is critical. For example:

Help desk staff should be trained to recognize abnormal password reset requests for high-privilege trading accounts.
Treasury teams should be alert to subtle anomalies in wire transfer authorization workflows.
Developers should understand how API abuse or token compromise could enable persistent access.

You can’t train employees to be distrustful of customers or colleagues. But you can train them to validate, verify and escalate unusual activity without disrupting business operations.

Generative artificial intelligence has further raised the stakes. Threat actors are using AI to create highly convincing phishing emails, deepfake voice calls targeting finance executives and automated reconnaissance scripts. In some cases, malicious toolkits for launching APT-style campaigns are widely available on dark web marketplaces.

EXPLORE: Here are four cybersecurity trends to watch in 2026.

Strengthening Security and Resilience in Financial Services

Financial institutions have made meaningful progress in strengthening foundational cybersecurity programs. More organizations now have CISOs at the executive table, along with mature governance frameworks aligned to the Securities and Exchange Commission cybersecurity disclosure requirements and evolving guidance from the Federal Financial Institutions Examination Council, FINRA, the New York Department of Financial Services and other regulatory standards.

However, advanced persistent threats require more than perimeter hardening.

Financial services IT teams should operate under the assumption that compromise is possible — or even likely. This mindset drives investments in:

Resilience planning must extend beyond backups. Institutions need rapid failover capabilities for online banking platforms, payment systems, trading environments and internal communications. Even short outages can erode customer confidence, trigger regulatory scrutiny and affect market performance.

Unlike other industries, financial services disruptions can ripple across markets. The ability to isolate compromised systems while maintaining customer-facing operations is critical.

Third-Party Risk and Connected Financial Systems

Today’s financial institutions operate in deeply interconnected ecosystems:

Core banking platforms
Payment processors
Fintech partners
Open banking application programming interfaces (APIs)
Cloud-hosted analytics environments

Each connection introduces potential exposure. Financial institutions must maintain visibility into third-party integrations and Software as a Service platforms. Many systems operate like black boxes — proprietary platforms with limited transparency into internal security controls.

Without continuous monitoring and segmentation, threat actors can move laterally from one trusted connection to another.

Gaining full visibility into identity flows, API usage and data movement — and isolating high-risk systems — is essential for managing complex hybrid environments.

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Sharing Threat Intelligence Across the Industry

One of the most powerful defenses against APTs is collaboration.

Financial services organizations should actively participate in industry information-sharing groups such as FS-ISAC and other threat intelligence communities. When institutions share indicators of compromise, attack patterns and lessons learned, the entire sector becomes stronger.

Talk about how an attack began. Identify how persistence was established. Share remediation strategies. Transparency strengthens collective defense. APTs thrive on silence and fragmentation. They struggle against informed, coordinated defenders.

Advanced persistent threats are not just IT problems. They are business risks that affect brand reputation, regulatory standing and customer trust.

For financial services IT leaders, the goal is not simply to prevent intrusion; it’s to detect quickly, contain effectively and recover rapidly.

Building layered defenses, strengthening identity governance, modernizing security operations center workflows and prioritizing resilience planning are essential steps. In a sector built on trust, security excellence becomes a competitive differentiator.

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