Disclosure context

About Karakurt

Karakurt is a ransomware group that emerged in December 2022, operating primarily as a data extortion threat actor with financial motivations rather than traditional file encryption. The group's origin and affiliations remain largely undocumented by major cybersecurity agencies, though their operational patterns suggest they function as an independent entity rather than a confirmed ransomware-as-a-service operation. Karakurt employs data theft and extortion tactics, focusing on exfiltrating sensitive information from victim networks before demanding payment under threat of public disclosure, representing a pure extortion model that bypasses traditional encryption-based ransomware approaches. The group has targeted 74 known victims across multiple sectors, with particular focus on healthcare, education, manufacturing, energy, and professional services organizations, primarily affecting entities in the United States, United Kingdom, Germany, Singapore, and India. Based on available reporting from established cybersecurity agencies and researchers, Karakurt appears to remain active as of recent assessments, though comprehensive intelligence on their specific attack vectors, tools, and major campaigns remains limited in publicly documented sources from CISA, FBI, and major security research organizations. The group has been linked to 74 public disclosures across our corpus. First observed on a leak site on December 11, 2022; most recent post September 22, 2023. The operation is currently inactive.

Timeline of this disclosure

May 23, 2023Chattanooga Heart Institute listed by Karakurton 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, Chattanooga Heart Institute 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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Chattanooga Heart Institute

Claimed by Karakurt · listed 3 years ago

36m

Age

since listed · data leaked

Status timeline

Listed
May 23, 2023
Data leaked

At a glance

Group: Karakurt
Status: Data leaked
Country: United States
Sector: Healthcare
Listed on leak site: May 23, 2023

About the victim

AI dossier — public-source company profile

Chattanooga Heart Institute at Memorial is a cardiac care facility located in Chattanooga, Tennessee, operating in affiliation with Memorial Health Care System. It provides a comprehensive multidisciplinary approach to cardiovascular diagnosis and treatment. The institute serves patients across the greater Chattanooga region.

Industry: Cardiovascular & Cardiac Care

Attack summary

Severity: critical — Confirmed exfiltration of highly regulated and sensitive data at scale, including medical records, diagnoses, Social Security numbers, and financial data belonging to both patients and employees of a healthcare provider — directly implicating HIPAA-protected PHI and PII.

Karakurt claims to have exfiltrated a broad range of sensitive data from Chattanooga Heart Institute, including medical records, test results, diagnoses, Social Security numbers, passport details, addresses, phone numbers, and financial data, with the group threatening to publish the data publicly.

critical

Data the group says was taken

AI dossier — extracted from the leak post

Medical records
Test results
Diagnoses
Social Security numbers
Passport documents
Home addresses
Phone numbers
Financial data
Employee personal data
Patient personal data

What the group claims

The Chattanooga Heart Institute at Memorial offers a comprehensive multidisciplinary approach to cardiac care. Another medical facility doesn't storage personal information safely. Employees and patients' private data will soon be here available for everyone. Medical records, tests results, diagnoses, social security numbers, passports, addresses, phone numbers, financial data and other documents are going to be uploaded.

Sources

Leak posthttps://3f7nxkjway3d223j27lyad7v5cgmyaifesycvmwq7i7cbs23lb6llryd.onion/companies/8894b129-dbc7-4ca1-b35c-18141249f1d7

Source

Indexed 3 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.