How A Bank Took Control of Its Digital Footprint with EASM

For most banking companies in the APAC region, digital transformation isn’t just a buzzword—it is their reality.

As a growing number of banks shift operations to the cloud, partner with innovative fintech providers, and enable a fully remote workforce, everything looks promising: scalable infrastructure, customer convenience, and operational agility. However, beneath this promising surface, security is struggling to keep up.

The Challenge of Expanding Digital Footprints

In most transformation cases, the internal cybersecurity team will be laser-focused on traditional risk areas—core banking systems, compliance checklists, and perimeter defense. But outside that well-guarded zone, something more unpredictable is happening. A sprawling mesh of cloud environments, legacy assets, partner systems, and exposed services will start to grow. Many of them will not be on the team’s radar.

In short: the bank’s external attack surface is expanding fast—and silently.

An attacker can breach the bank’s IT Infrastructure and disrupt operations, sabotage data, leak confidential information, steal customers’ data, etc.

Image I: illustrative case of a Bank: How an open-end in the IT environment caused havoc

The Wake-Up Call: A Bucket of Trouble

Trouble came knocking in the form of a simple Amazon S3 bucket.

A cybersecurity researcher publicly disclosed a misconfigured bucket that contained internal process documents, DevOps configurations, and sample data. It wasn’t susceptible, but it was enough to catch the attention of cybercriminals.

The bucket was tied to an old subdomain created by a third-party vendor with which the bank no longer worked. This asset had never been part of the bank’s official inventory and had no active monitoring.

Soon after the disclosure, attackers started their strategy by scanning related domains and discovered:

• A Jenkins dashboard with full administrative access and no login required
• A staging server with outdated libraries is susceptible to remote code execution
• An abandoned API is still active, revealing hardcoded credentials in responses

Then came the phishing campaigns. Lookalike domains mimicking the bank’s login portal started appearing online. Customers received convincing fake messages. Some even fell for them, resulting in fraud complaints and financial losses.

The True Cost of Exposure in the Finance Industry

This incident was more than just a technical failure—it was a business and reputational crisis waiting to escalate. In finance, a breach doesn’t just cause inconvenience; it can threaten the very foundation of the organization.

Here’s what the bank—and any financial institution—stands to lose:

This was no longer a conversation about a forgotten bucket—it was about organizational resilience in the face of modern cyber threats.

Turning the Tide: Enter External Attack Surface Management (EASM)

Realizing the severity of their blind spots, the bank took decisive action. They adopted an External Attack Surface Management (EASM) solution—a platform built to give organizations a continuous, outside-in view of their digital presence.

Unlike traditional tools for monitoring internal assets, EASM behaves like an attacker would. It scours the internet to find every domain, IP, cloud service, or exposed asset tied to your organization, whether or not you knew it existed.

What Changed After EASM Implementation

1. Visibility Like Never Before

The EASM platform began mapping the bank’s digital footprint in real time. It discovered over 300 unknown or unmanaged assets, including:

• Misconfigured storage buckets
• Expired and forgotten subdomains
• Exposed test environments
• Admin interfaces unintentionally left public

For the first time, the security team saw their infrastructure as a hacker would, and that changed everything.

2. Actionable Risk Prioritization

With so much exposure, the next question was: Where to start?

EASM helped prioritize vulnerabilities based on severity and exploitability. It flagged:

• Open admin panels
• Weak or outdated SSL certificates
• Unprotected error pages disclosing internal structures
• Publicly available dev endpoints with debug data

More importantly, each risk came with context and remediation advice. No guesswork—just clarity.

3. Real-Time Brand Protection

The platform began monitoring for phishing domains and brand impersonation attempts. Within hours of going live, it detected suspicious domain registrations that closely mimicked the bank’s brand.

From there, EASM triggered automated takedown requests and monitored:

• Fake mobile apps on app stores
• Social media impersonation
• Data leaks on forums and paste sites

What used to be reactive fraud management became proactive brand defense.

4. Third-Party Risk Management

Some of the most dangerous exposures came from vendors. EASM detected assets owned by third parties but linked to the bank, like forgotten subdomains or shared cloud storage.

Instead of relying on vendor claims, the bank had complex data: IPs, screenshots, and timestamps. They could engage partners with evidence, not assumptions.

Image II: EASM Platform Features – How LOGON can help your organization