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Lewis Baach Kaufmann Middlemiss PLLC

Claimed by Cephalus · listed 11 months ago

10m
Age
since listed · data leaked

Status timeline

  1. ListedAug 26, 2025
  2. Data leakeddate unknown

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

Source

Indexed 11 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.

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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

Other recent disclosures by cephalus

cephalus has been linked to 19 public victims on Darkfield. A sample of the most recent:

See the full cephalus dossier →

Sector and geography

This disclosure adds to ransomware activity in the Business Services sector, which has 3,796 disclosures indexed across all operators we track. Geographically, Lewis Baach Kaufmann Middlemiss PLLC is reported in United States, a country with 11,033 ransomware disclosures in our corpus.

If your organisation is affected

A listing by cephalus means Lewis Baach Kaufmann Middlemiss PLLC appeared on a ransomware extortion site and data attributed to it has been published. If this is your organisation, or a supplier you depend on, the priority is to confirm the intrusion and contain it before the window to act closes.

  • Engage your incident-response team and preserve forensic evidence before remediating — do not wipe affected systems first.
  • Force a password reset and revoke active sessions for exposed accounts; rotate any credentials, API keys or certificates that may have been in the stolen data.
  • Assess regulatory notification duties (GDPR, NIS2, sector regulators) — many carry a 72-hour reporting clock from awareness.
  • Report the incident to your national CERT, CISA (United States), as required for your jurisdiction.
  • Monitor for the data appearing on cephalus's leak site and across paste and breach channels, and brief downstream partners who may be exposed through you.

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.