Disclosure context

About Quantum

Quantum is a ransomware group that emerged in September 2021, operating with primarily financial motivations and demonstrating a focus on high-value targets across English-speaking nations. The group's geographic targeting patterns and operational characteristics suggest possible connections to established ransomware ecosystems, though specific attribution or confirmed affiliations with other threat actors remain undocumented in public reporting. Quantum operators typically employ double extortion tactics, combining data encryption with the threat of public data exposure to maximize pressure on victims, and their campaigns have consistently targeted sectors with critical operational dependencies including business services, manufacturing, and information technology infrastructure. The group has maintained a relatively low public profile compared to other major ransomware operations, with their 68 documented victims representing a more selective approach to target acquisition rather than broad-scale campaigns. Despite limited public law enforcement reporting specifically focused on Quantum operations, the group's continued activity pattern suggests they remain an active threat as of recent observations, though comprehensive operational details remain scarce in publicly available threat intelligence reporting. The group has been linked to 68 public disclosures across our corpus. First observed on a leak site on September 9, 2021; most recent post December 9, 2022. The operation is currently inactive.

Also tracked as: QuantumLocker, Mount Locker, DagonLocker.

Timeline of this disclosure

June 29, 2022Avante Health Solutions listed by Quantumon the group's public leak site

Sector and geography

This disclosure adds to ransomware activity in the Manufacturing sector, which has 2,458 disclosures indexed across all operators we track. Geographically, Avante Health Solutions 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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Avante Health Solutions

Claimed by Quantum · listed 4 years ago

47m

Age

since listed · data leaked

Status timeline

Listed
Jun 29, 2022
Data leaked

At a glance

Group: Quantum
Status: Data leaked
Country: United States
Sector: Manufacturing
Listed on leak site: Jun 29, 2022

About the victim

AI dossier — public-source company profile

Avante Health Solutions is a single-source provider of medical, surgical, diagnostic imaging, and radiation oncology equipment operating in the United States. The company offers sales, service, repair, parts, refurbishing, and installation to hospitals, clinics, and medical practices. It positions itself as a cost-effective supplier of high-quality healthcare equipment and supplies.

Industry: Medical Equipment Sales, Service & Refurbishment

Attack summary

Severity: high — Data has been confirmed published by the threat actor. Avante Health Solutions serves hospitals, clinics, and medical practices, meaning exfiltrated data likely contains sensitive business records, client PII, and potentially patient-adjacent information tied to healthcare customers, warranting a high severity classification.

The Quantum ransomware group claims to have attacked Avante Health Solutions and has published data ('data_published' status), indicating exfiltration of company data. The specific volume and nature of exfiltrated files are not detailed in the post.

high

Data the group says was taken

AI dossier — extracted from the leak post

Business operational data
Customer/client records (hospitals, clinics, medical practices)
Equipment sales and service records
Potentially patient-adjacent medical facility data

What the group claims

Avante Health Solutions is a single source provider of medical, surgical, diagnostic imaging, and radiation oncology equipment, including sales, service, repair, parts, refurbishing, and installation. Avante is making it easier and more affordable for every hospital, clinic, and medical practice to have the very best equipment, supplies and service.

Source

Indexed 4 years 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.