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

April 24, 2023TransMedics listed by Karakurton the group's public leak site

Data size: 85 GB

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, TransMedics 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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TransMedics

Claimed by Karakurt · listed 3 years ago

85 GB

Data size

37m

Age

since listed · data leaked

Status timeline

Listed
Apr 24, 2023
Data leaked

At a glance

Group: Karakurt
Status: Data leaked
Country: United States
Sector: Healthcare
Listed on leak site: Apr 24, 2023
Data size: 85 GB

About the victim

AI dossier — public-source company profile

TransMedics, Inc. is a US-based medical device company that develops and commercializes the Organ Care System (OCS), a portable warm blood perfusion platform designed to preserve and assess donor organs for transplantation. The company serves the transplant medicine market, enabling living-organ transport for heart, lung, and liver procedures. TransMedics is publicly traded on NASDAQ.

Industry: Medical Devices & Organ Transplantation
Employees: 201-500
Founded: 2004

Attack summary

Severity: critical — The group claims exfiltration of 85 GB encompassing regulated PII (employee personal data), financial records, and sensitive business contracts from a publicly traded medical device company in the healthcare sector; the disclosed status is data_published, indicating the data has been or is being released, compounding regulatory and market risk.

Karakurt claims to have exfiltrated approximately 85 GB of data from TransMedics and threatens to publish it imminently; the stolen data reportedly includes financial and accounting records, business contracts, executive correspondence, and detailed employee personal information.

critical

Data the group says was taken

AI dossier — extracted from the leak post

Financial and accounting records
Business contracts
Executive correspondence
Employee personal information (PII)
Confidential internal documents

What the group claims

TransMedics, Inc., a medical device company, develops and provides portable warm blood perfusion system that allows for living organ transplant. 85 GB of this company data will leak online soon opening all the financial and accounting information to the public. You will find their business contracts, correspondence with BIG executives, detailed employee personal information and other confidential papers uploaded here this week. Seems like we are going to witness another stock fall.

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.