WilmerHale, one of Washington's largest international law firms, faces a putative class action in the U.S. District Court for the District of Columbia over a May data breach the firm disclosed to clients on July 10. Lead plaintiff Jason Perry alleges the firm negligently failed to safeguard client information, seeking negligence and contract damages on behalf of "thousands" of potentially affected clients. The firm stated that the same unauthorized third party has been targeting legal industry firms broadly — a pattern reflected in recent suits against Blank Rome, Wiley Rein, Fried Frank, and Pillsbury Winthrop.

The case reinforces what the FBI and recent incidents have made clear: law firms are a priority target for data-theft operators because of the confidentiality, privilege, and litigation value attached to their files. Modern attacks against professional services firms increasingly target the network, endpoints, individual user sessions, cloud storage, and SaaS platforms via social engineering and credential theft. Traditional controls often miss these vectors because their activity spans multiple infrastructure domains.

Reducing this exposure requires visibility that consolidates the corporate network with endpoint, cloud, and SaaS-bound traffic, with the ability to detect anomalous data movement across channels. Effective controls include behavioral analytics on user data egress, DNS and TLS metadata analysis to spot exfiltration to attacker-controlled infrastructure, and full packet capture with long retention for forensic scoping. Unified platforms like NIKSUN — consolidating packets, flows, logs, events, and threat intelligence into a single data lake with AI-driven analytics and forensics — give law firms the cross-domain context needed to catch unauthorized cloud uploads, social-engineering-driven account abuse, and document exfiltration before the leverage that drives class action exposure and reputational damage is created. Read more about this story on our LinkedIn page