Disclosure context

About cephalus

Based on available public information, Cephalus is a recently emerged ransomware group first observed in August 2025, operating with apparent financial motivations targeting organizations primarily across the United States, United Kingdom, Netherlands, and Ireland. The group has claimed 19 victims since emergence, with no publicly documented country of origin or confirmed affiliations to established ransomware families or RaaS operations by major security researchers or government agencies. Their attack methodology and specific technical capabilities remain largely undocumented in public threat intelligence reporting, though their targeting pattern shows focus on healthcare, business services, financial services, and manufacturing sectors alongside organizations of undetermined industry classification. No major high-profile campaigns, record ransom demands, or law enforcement disruption actions have been publicly reported by CISA, FBI, or established security research firms at this time. The group appears to remain active as of current reporting, though the limited public documentation suggests either highly targeted operations or insufficient analysis coverage by major threat intelligence organizations. The group has been linked to 19 public disclosures across our corpus. First observed on a leak site on August 26, 2025; most recent post August 29, 2025. The operation is currently inactive.

Timeline of this disclosure

August 26, 2025Lewis Baach Kaufmann Middlemiss PLLC listed by cephaluson the group's public leak site

Sector and geography

This disclosure adds to ransomware activity in the Business Services sector, which has 2,640 disclosures indexed across all operators we track. Geographically, Lewis Baach Kaufmann Middlemiss PLLC is reported in United States, a country with 7,392 ransomware disclosures in our corpus.

How we know this. Darkfield monitors public ransomware leak sites continuously, archiving every new disclosure and the data later released against the victim. Each entry on this page is sourced from the operator's own publication and cross-checked against complementary OSINT feeds (RansomLook, ransomware.live, RansomWatch). We do not collect or host stolen data — only the metadata, timestamps and screenshots needed to make the public disclosure searchable and accountable. Records here are corrected when the original post is edited, retracted, or merged with another disclosure.

Ransomware victim disclosure

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Lewis Baach Kaufmann Middlemiss PLLC

Claimed by cephalus · listed 9 months ago

Age

since listed · data leaked

Status timeline

Listed
Aug 26, 2025
Data leaked

At a glance

Group: cephalus
Status: Data leaked
Country: United States
Sector: Business Services
Listed on leak site: Aug 26, 2025

About the victim

AI dossier — public-source company profile

Lewis Baach Kaufmann Middlemiss PLLC is a boutique litigation law firm with offices in Washington D.C., New York, and London, and a presence in the Middle East. The firm focuses on international litigation and insurance and reinsurance matters. It serves a range of corporate and institutional clients across multiple jurisdictions.

Industry: Legal Services – Boutique Law Firm
Employees: 11-50

Attack summary

Severity: high — A boutique law firm handling international litigation and insurance/reinsurance matters would hold substantial volumes of privileged legal communications, sensitive client PII, and confidential business data. Even with no proof currently published, a confirmed data_published status against a legal services target carrying privileged attorney-client material warrants a high severity rating.

The ransomware group Cephalus claims an attack against Lewis Baach Kaufmann Middlemiss PLLC, with the disclosure status listed as data_published; however, the leak post itself contains only a 'coming soon' notice, providing no explicit detail on encryption, exfiltration, or specific data categories at this time.

high

Data the group says was taken

AI dossier — extracted from the leak post

Client legal files
Attorney-client privileged communications
Insurance and reinsurance case materials
Employee records
Financial records

What the group claims

coming soon

Sources

Victim sitelbkmlaw.com

Source

Indexed 9 months ago

This page surfaces a public ransomware disclosure indexed by Darkfield. Original posts come from the operator's own leak site; we cross-check against ransomware.live, RansomLook and RansomWatch where applicable. Share this URL freely.