A Fortune 500 company was hit by a major ransomware attack. Hundreds of locations. Tens of thousands of employees. I was called in and within hours was actively engaged as Incident Commander and Interim CISO, leading containment, recovery, and a complete rebuild of the organization's security posture.
The Engagement
The attack had compromised the corporate network and was spreading laterally. The immediate priority was containment: isolating store operations from the corporate network so that hundreds of locations could continue operating and generating revenue, while cutting off the attacker's ability to move. I shut down all outbound network traffic, rearchitected the network topology to create new chokepoints with full visibility into lateral movement, and identified and severed the active command-and-control channel through the new bottleneck architecture. One ecommerce cluster was taken offline as a containment measure. All of this happened within hours of engagement.
The business impact was zero. All locations operated throughout. The financial results showed no revenue loss, no ransom was paid, and no customer data was compromised.
Recovery and hardening took months. I shut down all accounts organization-wide and rebuilt identity on a cloud-first architecture with zero global admin privileges. I designed and deployed a hierarchical re-enrollment process: photo ID verification for 50,000 employees, cascading from executives through managers to front-line staff. MFA was enforced across the entire organization, with hardware tokens deployed where authenticator apps were not viable. I rearchitected how contractors could access the environment, and designed an environment segmentation strategy separating development and production to prevent the kind of lateral traversal that had made the attack possible. Previously, contractors had access to all systems through a single entry point.
Results
- Revenue impact: zero. All locations operated throughout. Industry baseline: 75% of organizations report significant revenue loss from ransomware.
- Ransom paid: $0. Industry median exceeds $1.5M.
- Containment: hours from detection to full network lockdown. Industry average recovery: 24 days.
- 50,000 identities re-enrolled with photo-verified, MFA-enforced cloud-first accounts.
- Security posture rebuilt. Environment segmentation, contractor access redesign, and zero global admin privileges across the organization.