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* Products  
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  * [SaaS Security](https://www.paloaltonetworks.com/sase/saas-security?ts=markdown)  
    [AI-Driven Security Operations Platform](https://www.paloaltonetworks.com/cortex?ts=markdown)
  
  * [Cloud Security](https://www.paloaltonetworks.com/cortex/cloud?ts=markdown)
  
  * [Cortex Cloud](https://www.paloaltonetworks.com/cortex/cloud?ts=markdown)
  
  * [Application Security](https://www.paloaltonetworks.com/cortex/cloud/application-security?ts=markdown)
  
  * [Cloud Posture Security](https://www.paloaltonetworks.com/cortex/cloud/cloud-posture-security?ts=markdown)
  
  * [Cloud Runtime Security](https://www.paloaltonetworks.com/cortex/cloud/runtime-security?ts=markdown)
  
  * [Prisma Cloud](https://www.paloaltonetworks.com/prisma/cloud?ts=markdown)
  
  * [AI-Driven SOC](https://www.paloaltonetworks.com/cortex?ts=markdown)
  
  * [Cortex XSIAM](https://www.paloaltonetworks.com/cortex/cortex-xsiam?ts=markdown)
  
  * [Cortex XDR](https://www.paloaltonetworks.com/cortex/cortex-xdr?ts=markdown)
  
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  * [Cortex XSOAR](https://www.paloaltonetworks.com/cortex/cortex-xsoar?ts=markdown)
  
  * [Cortex Exposure Management](https://www.paloaltonetworks.com/cortex/exposure-management?ts=markdown)
  
  * [Cortex Xpanse](https://www.paloaltonetworks.com/cortex/cortex-xpanse?ts=markdown)
  
  * [Cortex Advanced Email Security](https://www.paloaltonetworks.com/cortex/advanced-email-security?ts=markdown)
  
  * [Unit 42 Managed Detection \& Response](https://www.paloaltonetworks.com/cortex/managed-detection-and-response?ts=markdown)
  
  * [Unit 42 Managed XSIAM](https://www.paloaltonetworks.com/cortex/managed-xsiam?ts=markdown)

* Solutions  
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  Secure AI by Design
  
  * [Secure AI Ecosystem](https://www.paloaltonetworks.com/prisma/prisma-ai-runtime-security?ts=markdown)
  * [Secure GenAI Usage](https://www.paloaltonetworks.com/sase/ai-access-security?ts=markdown)  
    Network Security
  * [Cloud Network Security](https://www.paloaltonetworks.com/network-security/software-firewalls?ts=markdown)
  * [Data Center Security](https://www.paloaltonetworks.com/network-security/data-center?ts=markdown)
  * [DNS Security](https://www.paloaltonetworks.com/network-security/advanced-dns-security?ts=markdown)
  * [Intrusion Detection and Prevention](https://www.paloaltonetworks.com/network-security/advanced-threat-prevention?ts=markdown)
  * [Device Security](https://www.paloaltonetworks.com/network-security/device-security?ts=markdown)
  * [OT Security](https://www.paloaltonetworks.com/network-security/ot-device-security?ts=markdown)
  * [5G Security](https://www.paloaltonetworks.com/network-security/5g-security?ts=markdown)
  * [Secure All Apps, Users and Locations](https://www.paloaltonetworks.com/sase/secure-users-data-apps-devices?ts=markdown)
  * [Secure Branch Transformation](https://www.paloaltonetworks.com/sase/secure-branch-transformation?ts=markdown)
  * [Secure Work on Any Device](https://www.paloaltonetworks.com/sase/secure-work-on-any-device?ts=markdown)
  * [VPN Replacement](https://www.paloaltonetworks.com/sase/vpn-replacement-for-secure-remote-access?ts=markdown)
  * [Web \& Phishing Security](https://www.paloaltonetworks.com/network-security/advanced-url-filtering?ts=markdown)  
    Cloud Security
  * [Application Security Posture Management (ASPM)](https://www.paloaltonetworks.com/cortex/cloud/application-security-posture-management?ts=markdown)
  * [Software Supply Chain Security](https://www.paloaltonetworks.com/cortex/cloud/software-supply-chain-security?ts=markdown)
  * [Code Security](https://www.paloaltonetworks.com/cortex/cloud/code-security?ts=markdown)
  * [Cloud Security Posture Management (CSPM)](https://www.paloaltonetworks.com/cortex/cloud/cloud-security-posture-management?ts=markdown)
  * [Cloud Infrastructure Entitlement Management (CIEM)](https://www.paloaltonetworks.com/cortex/cloud/cloud-infrastructure-entitlement-management?ts=markdown)
  * [Data Security Posture Management (DSPM)](https://www.paloaltonetworks.com/cortex/cloud/data-security-posture-management?ts=markdown)
  * [AI Security Posture Management (AI-SPM)](https://www.paloaltonetworks.com/cortex/cloud/ai-security-posture-management?ts=markdown)
  * [Cloud Detection \& Response](https://www.paloaltonetworks.com/cortex/cloud-detection-and-response?ts=markdown)
  * [Cloud Workload Protection (CWP)](https://www.paloaltonetworks.com/cortex/cloud/cloud-workload-protection?ts=markdown)
  * [Web Application \& API Security (WAAS)](https://www.paloaltonetworks.com/cortex/cloud/web-app-api-security?ts=markdown)  
    Security Operations
  * [Cloud Detection \& Response](https://www.paloaltonetworks.com/cortex/cloud-detection-and-response?ts=markdown)
  * [Security Information and Event Management](https://www.paloaltonetworks.com/cortex/modernize-siem?ts=markdown)
  * [Network Security Automation](https://www.paloaltonetworks.com/cortex/network-security-automation?ts=markdown)
  * [Incident Case Management](https://www.paloaltonetworks.com/cortex/incident-case-management?ts=markdown)
  * [SOC Automation](https://www.paloaltonetworks.com/cortex/security-operations-automation?ts=markdown)
  * [Threat Intel Management](https://www.paloaltonetworks.com/cortex/threat-intel-management?ts=markdown)
  * [Managed Detection \& Response](https://www.paloaltonetworks.com/cortex/managed-detection-and-response?ts=markdown)
  * [Attack Surface Management](https://www.paloaltonetworks.com/cortex/cortex-xpanse/attack-surface-management?ts=markdown)
  * [Compliance Management](https://www.paloaltonetworks.com/cortex/cortex-xpanse/compliance-management?ts=markdown)
  * [Internet Operations Management](https://www.paloaltonetworks.com/cortex/cortex-xpanse/internet-operations-management?ts=markdown)
  * [Extended Data Lake (XDL)](https://www.paloaltonetworks.com/cortex/cortex-xdl?ts=markdown)
  * [Agentic Assistant](https://www.paloaltonetworks.com/cortex/cortex-agentic-assistant?ts=markdown)  
    Endpoint Security
  * [Endpoint Protection](https://www.paloaltonetworks.com/cortex/endpoint-protection?ts=markdown)
  * [Extended Detection \& Response](https://www.paloaltonetworks.com/cortex/detection-and-response?ts=markdown)
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  * [Small \& Medium Business Solutions](https://www.paloaltonetworks.com/industry/small-medium-business-portfolio?ts=markdown)

* Services  
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  [Threat Intel and Incident Response Services](https://www.paloaltonetworks.com/unit42?ts=markdown)
  
  * [Assess](https://www.paloaltonetworks.com/unit42/assess?ts=markdown)
  
  * [AI Security Assessment](https://www.paloaltonetworks.com/unit42/assess/ai-security-assessment?ts=markdown)
  
  * [Attack Surface Assessment](https://www.paloaltonetworks.com/unit42/assess/attack-surface-assessment?ts=markdown)
  
  * [Breach Readiness Review](https://www.paloaltonetworks.com/unit42/assess/breach-readiness-review?ts=markdown)
  
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  * [Cloud Security Assessment](https://www.paloaltonetworks.com/unit42/assess/cloud-security-assessment?ts=markdown)
  
  * [Compromise Assessment](https://www.paloaltonetworks.com/unit42/assess/compromise-assessment?ts=markdown)
  
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  * [M\&A Cyber Due Diligence](https://www.paloaltonetworks.com/unit42/assess/mergers-acquisitions-cyber-due-diligence?ts=markdown)
  
  * [Penetration Testing](https://www.paloaltonetworks.com/unit42/assess/penetration-testing?ts=markdown)
  
  * [Purple Team Exercises](https://www.paloaltonetworks.com/unit42/assess/purple-teaming?ts=markdown)
  
  * [Ransomware Readiness Assessment](https://www.paloaltonetworks.com/unit42/assess/ransomware-readiness-assessment?ts=markdown)
  
  * [SOC Assessment](https://www.paloaltonetworks.com/unit42/assess/soc-assessment?ts=markdown)
  
  * [Supply Chain Risk Assessment](https://www.paloaltonetworks.com/unit42/assess/supply-chain-risk-assessment?ts=markdown)
  
  * [Tabletop Exercises](https://www.paloaltonetworks.com/unit42/assess/tabletop-exercise?ts=markdown)
  
  * [Unit 42 Retainer](https://www.paloaltonetworks.com/unit42/retainer?ts=markdown)
  
  * [Respond](https://www.paloaltonetworks.com/unit42/respond?ts=markdown)
  
  * [Cloud Incident Response](https://www.paloaltonetworks.com/unit42/respond/cloud-incident-response?ts=markdown)
  
  * [Digital Forensics](https://www.paloaltonetworks.com/unit42/respond/digital-forensics?ts=markdown)
  
  * [Incident Response](https://www.paloaltonetworks.com/unit42/respond/incident-response?ts=markdown)
  
  * [Managed Detection and Response](https://www.paloaltonetworks.com/unit42/respond/managed-detection-response?ts=markdown)
  
  * [Managed Threat Hunting](https://www.paloaltonetworks.com/unit42/respond/managed-threat-hunting?ts=markdown)
  
  * [Managed XSIAM](https://www.paloaltonetworks.com/cortex/managed-xsiam?ts=markdown)
  
  * [Unit 42 Retainer](https://www.paloaltonetworks.com/unit42/retainer?ts=markdown)
  
  * [Transform](https://www.paloaltonetworks.com/unit42/transform?ts=markdown)
  
  * [IR Plan Development and Review](https://www.paloaltonetworks.com/unit42/transform/incident-response-plan-development-review?ts=markdown)
  
  * [Security Program Design](https://www.paloaltonetworks.com/unit42/transform/security-program-design?ts=markdown)
  
  * [Virtual CISO](https://www.paloaltonetworks.com/unit42/transform/vciso?ts=markdown)
  
  * [Zero Trust Advisory](https://www.paloaltonetworks.com/unit42/transform/zero-trust-advisory?ts=markdown)  
    [Global Customer Services](https://www.paloaltonetworks.com/services?ts=markdown)
  
  * [Education \& Training](https://www.paloaltonetworks.com/services/education?ts=markdown)
  
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    UNIT 42 RETAINER
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* Partners  
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  * [Solution Providers](https://www.paloaltonetworks.com/partners/nextwave-solution-providers?ts=markdown)
  * [Managed Security Service Providers](https://www.paloaltonetworks.com/partners/managed-security-service-providers?ts=markdown)
  * [XMDR Partners](https://www.paloaltonetworks.com/partners/managed-security-service-providers/xmdr?ts=markdown)  
    Take Action
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  * [Become a Partner](https://paloaltonetworks.my.site.com/NextWavePartnerProgram/s/partnerregistration?type=becomepartner)
  * [Request Access](https://paloaltonetworks.my.site.com/NextWavePartnerProgram/s/partnerregistration?type=requestaccess)
  * [Find a Partner](https://paloaltonetworks.my.site.com/NextWavePartnerProgram/s/partnerlocator)  
    [CYBERFORCE
    CYBERFORCE represents the top 1% of partner engineers trusted for their security expertise.
    Learn more](https://www.paloaltonetworks.com/cyberforce?ts=markdown)

* Company  
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  Palo Alto Networks
  
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  * [Precision AI Security](https://www.paloaltonetworks.com/precision-ai-security?ts=markdown)
  * [Our Platform Approach](https://www.paloaltonetworks.com/why-paloaltonetworks/platformization?ts=markdown)
  * [Accelerate Your Cybersecurity Transformation](https://www.paloaltonetworks.com/why-paloaltonetworks/nam-cxo-portfolio?ts=markdown)
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    Careers
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    Read more](https://www.paloaltonetworks.com/company/press/2021/palo-alto-networks-secures-top-ranking-on-newsweek-s-most-loved-workplaces-list-for-2021?ts=markdown)

* More  
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  * [Threat Vector Podcast](https://unit42.paloaltonetworks.com/unit-42-threat-vector-podcast/)
  * [Packet Pushers Podcasts](https://www.paloaltonetworks.com/podcasts/packet-pusher?ts=markdown)  
    Connect
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  Major Financial Institution

# Major financial institution engages Unit 42 to investigate presumed insider threat

* [Watch Video](https://www.paloaltonetworks.com//players.brightcove.net/1050259881001/default_default/index.html?videoId=6338318160112&ts=markdown)  
  In brief

### Industry

Financial services

### Products and Services

Unit 42^®^ Incident Response

### Country

United States

*** ** * ** ***

### Challenge

A financial services client discovered it was losing millions of dollars' worth of sensitive, high-value customer data from its business loan application source --- and an anonymous emailer was threatening to go public with the data leak.

### Requirements

* Identify the source of the data leak
* Determine if an outside threat actor was involved
* Contain and evict the threat actor
* Operate stealthily, without disrupting business operations

### Results

The Unit 42 Incident Response team used investigative tactics --- including source code review, expert threat intelligence, and offensive security --- to identify the vulnerability, evict the threat actor, and ensure that the financial institution resolved the vulnerability.  
[Download PDF](https://www.paloaltonetworks.com/content/dam/pan/en_US/assets/pdf/customers/major-financial-institution-engages-unit-42-to-investigate-presumed-insider-threat.pdf?ts=markdown)  
Introduction  
A major financial institution learned that sensitive data was leaking from their environment and they were on the verge of being exposed by an anonymous source. Because the company suspected an insider threat, they needed a partner who could act quickly and stealthily to uncover the source of the data leak and resolve the incident --- without disrupting business operations.

*** ** * ** ***

![Mobile](https://www.paloaltonetworks.com/content/dam/pan/en_US/images/case-study/video-thumbnail-major-financial-institution.jpg)  
Volume  
Play

*** ** * ** ***

CHALLENGE

## Bad news from an anonymous source

A major financial institution received an anonymous email with insider knowledge that sensitive customer data was leaving the company's environment. If the company didn't fix the breach, the email threatened, the writer would go public with the information.

After an initial investigation, the company determined that data from business loan applications was being stolen. Worse, the data included confidential business financial details and personally identifiable information (PII) like Social Security numbers. That kind of loss could have disastrous financial and legal consequences for the company and its victims.

How was the data getting out? Given their strong security posture, the internal security team suspected an insider threat. Aware that they needed expert support not only to detect the source of the leak but also to handle a sensitive situation, the organization brought in Palo Alto Networks Unit 42^®^.

## "Insider threat cases are sensitive. You're dealing with employees, potential HR and legal issues. The approach has to be a little quieter, a little softer touch."

\-- Chris Brewer

Unit 42 Consulting Director  
REQUIREMENTS

## A special kind of investigation

With such high stakes, the client needed Unit 42 to uncover the source of the issue --- and fix it --- as quickly as possible.

Because the client suspected an insider threat, two things were essential: First, the investigation had to include granular visibility into user activity on any and all endpoints, a capability the client lacked. And second, it was critical that Unit 42 act stealthily, in a way that didn't disrupt the workforce or the business.

## Gaining complete visibility into user endpoints

At first, Unit 42 approached the investigation as an insider threat, and there was evidence to support this theory. For example, data was being exfiltrated at the same time daily. So, the team began looking at user machines for illicit activity.

"Initially, we deployed Cortex XDR, our endpoint detection response product," Brewer says. "It shows us everything a user is doing --- their browser history, applications, processes."

Cortex XDR^®^ gave Unit 42 the ability to see a wide range of activities in user behavior, including whether employees were uploading data to file sharing sites or plugging in USB drives and copying data onto them. The answer, surprisingly, was no. There was nothing malicious happening on the inside.

## Pivoting to a new approach

If this wasn't an inside job, who was executing the attack? Even though the client had strong security and application controls in place, Unit 42 went back to basics, checking the frontend of the company's website. And when the team looked at how accounts were accessed, they discovered what is actually a common vulnerability: an insecure direct object reference (IDOR).

Brewer explains, "On some websites, you can have a user ID that's a numerical value. And in this case, you could just change a number in that user ID and access another person's account information." The glitch was the result of a change in code that the client had made but hadn't tested sufficiently. "They just missed that piece," Brewer says.

## Instant scaling with expert skill sets

Once discovered, the resolution was straightforward, but pinpointing the breach was a formidable task. The client's website was massive, with dozens of servers and a number of integrated software-as-a-service (SaaS) platforms.

"The dataset we looked at was very, very large," Brewer recalls. "To paint a picture of the environment, we had to coordinate the data from the website logs with the logs from the SaaS platforms and firewalls."

That complexity of analysis required unique skill sets and additional people power, so Unit 42 scaled up, bringing in experts on particular applications and log sets. "To keep things lean, we always start with a focused team," Brewer says. "But when the situation demands it, Unit 42 can scale instantly."

The result? A quick pivot to a resolution. "The client was actually surprised that we were able to pick up on the uniqueness and the intricacies of their code," Brewer remembers. "But we have experts with a high level of technical skill, and they can adapt quickly."

## Looking at the problem from every angle

Vital to any Unit 42 investigation is its Threat Intelligence team, which works to identify the attacker's tactics, techniques, and procedures (TTPs), including where they're operating from and the IP addresses they're using. The team also determines whether the illicit activity is tied to a known threat actor group, which could be statesponsored. In the case of the loan data breach, it wasn't.

Another angle Unit 42 uses in investigating a breach is offensive security. "Their job is to find the vulnerabilities and attempt to exploit them in ways that could compromise an entire company," Brewer says. From there, Unit 42 can look for evidence of similar malicious activities inside the log. "That really helps speed up an investigation."

## Working hand in hand with the client

Unit 42 always collaborates with clients in an equal partnership. In this case, because the source code for the financial institution's website was so complex, the work was truly side by side.

"We worked very closely with the client's security engineering team," Brewer explains. "We were looking at custom PHP, custom database entries, custom error-checking and security measures. Collaboration was essential."

Given the nature of the breach and the impact on the business, communication with the C-suite was also vital. The CEO and board of directors were duly concerned. The Unit 42 team provided daily updates on phone calls and video conferences, walking them through what was discovered and how it was being handled.

## "When we work with a client, we're there for you, working as closely as we can with your security team, your engineering team, your administrators, your C-suite. We're right there alongside you."

\-- Chris Brewer

Unit 42 Consulting Director  
RESULTS

## Making sure the fix stays fixed

Once the vulnerability was identified --- a missing security check that should have disabled one account from logging in to another --- the client demonstrated to Unit 42 that they had fixed it. But fixing a vulnerability and proving that the fix works are two different things.

Unit 42 tested the code to make sure that the attack had been stopped and the vulnerability secured against future attacks. And as they reviewed the code, they checked to make sure that the same vulnerability wasn't present elsewhere on the website.

A critical lesson for the financial institution: Even the smallest chink in protections can compromise an otherwise robust security posture. "Everything else on their website was safe and secure," Brewer says. "It was just one little change they had made that inadvertently allowed this attack."

## Looking forward, tightening up

After Unit 42 resolved the threat, the team provided the client with a series of recommendations for fine-tuning their security posture going forward. Chief among them: Conduct a code review any time a code or application change is made to frontend systems. And for internet-facing assets, do a web application penetration test on that side of that domain to ensure that no inadvertent vulnerabilities are accidentally introduced.

For many organizations, regardless of size or maturity, a breach underscores how complex security can be, with so many small actions that can have outsized repercussions. At the end of the engagement, Unit 42 looks to build a long-term partnership and help the client align on clear steps to be more secure in the future.

## "One of the things that sets Unit 42 apart is that we want to be with you for the long haul. We want not only to resolve the incident but also to start thinking about long-term goals and how we can help you be more secure going forward."

\-- Chris Brewer

Unit 42 Consulting Director  
About Unit 42  
*[Palo Alto Networks Unit 42^®^](https://www.paloaltonetworks.com/unit42?ts=markdown)* brings together world-renowned threat researchers, elite incident responders, and expert security consultants to create an intelligence-driven, response-ready organization that is passionate about helping you proactively manage cyber risk. Our team serves as your trusted advisor to help assess and test your security controls against the right threats, transform your security strategy with a threat-informed approach, and respond to incidents in record time so that you get back to business faster.

*If you'd like to learn more about how Unit 42 can help your organization defend against and respond to severe cyberthreats, visit [start.paloaltonetworks.com/contact-unit42.html](http://start.paloaltonetworks.com/contact-unit42.html) to connect with a team member.*  
Under attack?  
If you're concerned you've an insider threat or data has been illegally stolen, Unit 42 is ready to help assess your risk and remediate the incident. Call us at North America toll free: +1.866.486.4842 (+1.866.4.UNIT42), EMEA: +31.20.299.3130, UK: +44.20.3743.3660, APAC: +65.6983.8730, or Japan: +81.50.1790.0200, or get in touch by visiting *[start.paloaltonetworks.com/contact-unit42.html](http://start.paloaltonetworks.com/contact-unit42.html).*

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*** ** * ** ***

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