Disclosure context

About threeam

Threeam is a financially motivated ransomware group that emerged in September 2023, operating as a relatively new player in the ransomware ecosystem with 64 documented victims across multiple countries and sectors. The group's origin and potential affiliations remain unclear due to limited public documentation from major security agencies, though their targeting patterns suggest a broad opportunistic approach rather than nation-state backing. Based on available victim data, Threeam appears to employ common initial access vectors targeting organizations across business services, healthcare, manufacturing, and technology sectors, with the United States, United Kingdom, Australia, France, and Brazil representing their primary geographic focus areas. While specific technical details about their encryption methods and extortion tactics have not been extensively documented by major threat intelligence firms, their emergence in late 2023 and victim count suggests they have established operational capabilities within the competitive ransomware landscape. The group's current operational status remains active based on the recency of their emergence, though detailed law enforcement actions or disruption efforts have not been publicly reported by CISA, FBI, or other major security organizations. The group has been linked to 73 public disclosures across our corpus. First observed on a leak site on September 14, 2023; most recent post May 1, 2026. The operation is currently inactive.

Timeline of this disclosure

May 1, 2026sequoiadental.com listed by threeamon the group's public leak site

Sector and geography

This disclosure adds to ransomware activity in the Healthcare sector, which has 1,779 disclosures indexed across all operators we track. Geographically, sequoiadental.com is reported in US, a country with 2,713 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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sequoiadental.com

Claimed by threeam · listed 20 days ago

19d

Age

since listed · data leaked

Status timeline

Listed
May 1, 2026
Data leaked

At a glance

Group: threeam
Status: Data leaked
Country: US
Sector: Healthcare
Listed on leak site: May 1, 2026

About the victim

AI dossier — public-source company profile

Sequoia Dental Office is a dental practice located in Visalia, California. They provide a wide range of dental services including general, cosmetic, orthodontic, and restorative dentistry. The practice emphasizes patient comfort and uses advanced dental technology in their care delivery.

Industry: Dental & Oral Healthcare Services
Address: Visalia, CA, US

Attack summary

Severity: critical — The victim is a US healthcare provider and the status is 'data_published', indicating confirmed exfiltration and public release of data that almost certainly includes regulated patient health information (PHI) protected under HIPAA.

The ThreeAM ransomware group claims to have attacked Sequoia Dental Office and has published data, suggesting exfiltration of patient and/or business records. The disclosed status indicates data has been published, though the specific volume and ransom amount are not stated.

critical

Data the group says was taken

AI dossier — extracted from the leak post

Patient records
Personal health information (PHI)
Patient contact and demographic data
Dental treatment records
Potentially insurance/billing information

What the group claims

Sequoia Dental Office provides a wide range of dental services including general, cosmetic, orthodontic, and restorative dentistry. Located in Visalia, CA, they are dedicated to patient comfort and use advanced technology to enhance care, offering

Sources

Source

Indexed 20 days 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.