A regional financial institution with a multi-state branch network woke to find that ransomware had encrypted critical systems overnight. Core banking applications, back-office infrastructure, and several customer-facing digital channels were offline. The institution's internal IT team had isolated affected segments but lacked the forensic expertise to determine the attack's origin, confirm whether customer data had been exfiltrated before encryption, or assess whether attacker access had been fully eliminated. Regulatory clocks were already ticking.
Law & Forensics was engaged before business hours and had a team on-site and working remotely within the same day.
The Challenge
Ransomware response at a regulated financial institution is more complex than at a typical enterprise. Banking regulators—including federal and state banking supervisors—impose specific notification timelines and expect the institution to be able to describe the scope of any data compromise with precision. "We don't know" is not a defensible posture. At the same time, the pressure to restore operations for customers who cannot access accounts creates urgency that can conflict with the thoroughness that sound forensics requires.
The institution needed a single team that could handle the technical response and the regulatory and legal dimensions in an integrated way—without the friction of separate firms working in silos.
What Law & Forensics Did
Law & Forensics organized the engagement around four concurrent workstreams.
Forensic Investigation. The team imaged affected systems before remediation began, preserving evidence for analysis. Forensic examination of endpoint telemetry, network logs, and Active Directory records reconstructed the full attack chain—initial access vector, lateral movement, privilege escalation, and the specific point at which ransomware was deployed. Critically, the team also determined whether any data had been staged or exfiltrated before encryption, which is central to determining notification scope.
Containment and Eradication. Working alongside the institution's IT team, Law & Forensics directed the isolation of compromised segments, the removal of malicious tooling and persistence mechanisms, and the verification that attacker access had been fully severed before recovery began.
Regulatory Coordination. Law & Forensics' professionals—drawing on backgrounds that include former regulatory staff—assisted the institution and its counsel in preparing defensible notifications to relevant banking regulators and, where required, to affected customers. Notifications were grounded in the forensic findings, giving regulators the precise scope of the incident rather than speculative estimates.
Recovery and Remediation. Once the environment was confirmed clean, the team supported the prioritized restoration of core banking systems. A post-incident report documented the root-cause vulnerabilities and provided a prioritized remediation roadmap, including specific recommendations on identity and access management controls, network segmentation, and endpoint detection capabilities.
Outcome
Core operations were restored within the window required for regulatory notification. The forensic record the team produced gave the institution's counsel and compliance team a defensible basis for every claim made in regulatory filings. The post-incident remediation roadmap is being implemented in phases, with Law & Forensics providing ongoing advisory support.
The engagement illustrates Law & Forensics' differentiated approach to financial-institution incident response: the ability to manage the technical, legal, and regulatory dimensions of a cyber incident from a single, integrated team.
Related Practice Area
Cybersecurity Services — Incident Response, Cybersecurity Solutions for Financial Institutions, Cybersecurity Consulting; Digital Banking Services — Digital Banking Regulatory Compliance
