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 14, 2022Medlab Pathology listed by Quantumon the group's public leak site

Sector and geography

This disclosure adds to ransomware activity in the Healthcare Services sector, which has 11 disclosures indexed across all operators we track. Geographically, Medlab Pathology is reported in Australia, a country with 368 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

← All victims

Medlab Pathology

Claimed by Quantum · listed 4 years ago

47m

Age

since listed · data leaked

Status timeline

Listed
Jun 14, 2022
Data leaked

At a glance

Group: Quantum
Status: Data leaked
Country: Australia
Sector: Healthcare Services
Listed on leak site: Jun 14, 2022

About the victim

AI dossier — public-source company profile

Medlab Pathology is one of Australia's largest privately owned independent pathology practices, providing diagnostic laboratory testing services to patients and clinicians across Australia. As a major independent operator in the Australian pathology sector, it handles significant volumes of patient specimens and associated medical data.

Industry: Medical Laboratory & Pathology Services
Employees: 201-500

Attack summary

Severity: critical — Medlab Pathology is a large medical diagnostics provider handling sensitive patient health data, pathology results, and PII at scale. The data_published status confirms exfiltration of what is almost certainly regulated healthcare/medical data, which qualifies as critical under Australian Privacy Act and likely My Health Records Act obligations.

The Quantum ransomware group claims an attack on Medlab Pathology and has published data (disclosed status: data_published), indicating exfiltration of company data with contents made available on their leak site.

critical

Data the group says was taken

AI dossier — extracted from the leak post

Patient medical records
Pathology test results
Personal identifiable information (PII)
Medical diagnostic data
Employee records

What the group claims

Medlab Pathology is one of Australia's largest, privately owned independent pathology practices

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.