Disclosure context

About Revil

REvil, also known as Sodinokibi, was a highly sophisticated ransomware-as-a-service operation that emerged in April 2019 and quickly became one of the most prolific and financially successful cybercriminal organizations, primarily motivated by financial gain. The group is believed to have originated from Russia, operating as a RaaS model where core developers rented their ransomware tools to affiliate criminals, and maintained connections to the now-defunct GandCrab ransomware operation with some researchers suggesting personnel overlap. REvil primarily gained initial access through exploiting vulnerabilities in remote desktop protocol implementations, phishing campaigns, and supply chain attacks, employing double extortion tactics where they exfiltrated sensitive data before encryption and threatened to publish it on their "Happy Blog" leak site if ransoms were not paid, using advanced encryption methods that made file recovery nearly impossible without payment. The group conducted several high-profile attacks including the devastating supply chain attack against Kaseya in July 2021 that affected thousands of downstream customers, attacks on major corporations like JBS Foods, and demanded ransoms reaching up to $70 million, ultimately leading to increased law enforcement attention and pressure from international authorities. Following coordinated law enforcement actions and mounting pressure from the U.S. and Russian governments in late 2021, REvil's infrastructure was taken down and the group ceased operations, with several suspected members reportedly arrested by Russian authorities. The group has been linked to 96 public disclosures across our corpus. First observed on a leak site on August 26, 2019; most recent post January 6, 2023. The operation is currently inactive.

Also tracked as: Sodinokibi.

Timeline of this disclosure

November 7, 2022medibank.com.au listed by Revilon the group's public leak site

Sector and geography

This disclosure adds to ransomware activity in the Financial Services sector, which has 516 disclosures indexed across all operators we track. Geographically, medibank.com.au 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

Medibank

listed as medibank.com.au · Claimed by Revil · listed 4 years ago

43m

Age

since listed · data leaked

Status timeline

Listed
Nov 7, 2022
Data leaked

At a glance

Group: Revil
Status: Data leaked
Country: Australia
Sector: Financial Services
Listed on leak site: Nov 7, 2022

About the victim

AI dossier — public-source company profile

Medibank is one of Australia's largest private health insurers, providing health insurance products and services to approximately 3.7 million customers across Australia. The company operates under both the Medibank and ahm Health Insurance brands and is listed on the Australian Securities Exchange. It also offers a range of health and wellbeing services beyond insurance.

Industry: Private Health Insurance
Address: 720 Bourke Street, Docklands, Victoria 3008, Australia
Employees: 3000-4000
Founded: 1976

Attack summary

Severity: critical — Medibank is a major health insurer; the publicly documented breach involved exfiltration of sensitive medical and PII data for millions of Australian customers, constituting a large-scale regulated data disclosure involving health records.

The REvil group claims to have attacked Medibank and the disclosure status is listed as data_published, indicating that stolen data has been released. The attack is consistent with publicly documented events in which sensitive customer health and personal data was exfiltrated.

critical

Data the group says was taken

AI dossier — extracted from the leak post

Customer personally identifiable information (PII)
Health claims data
Medical records
Policy and membership details
Contact and address information
Date of birth records
Medicare card numbers

Sources

Victim sitemedibank.com

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.