Disclosure context

About Medusa

Medusa, also known as MedusaLocker, is a financially motivated ransomware group that emerged in November 2022 and has since compromised 568 known victims across multiple countries. The group's origin and specific affiliations remain unclear from publicly available intelligence, though their operational patterns suggest they function as an independent ransomware operation rather than a documented Ransomware-as-a-Service model. Medusa primarily targets organizations in the United States, United Kingdom, Canada, Italy, and Australia, with a focus on business services, healthcare, manufacturing, and technology sectors, employing typical ransomware tactics including data encryption and likely exfiltration for double extortion purposes, though specific technical methodologies and initial access vectors have not been extensively documented in public threat intelligence reports. While the group has maintained a relatively high victim count since its emergence, detailed information about specific notable campaigns, high-profile victims, or major ransom demands has not been widely reported by major cybersecurity firms or law enforcement agencies. As of current intelligence assessments, Medusa appears to remain active in the threat landscape, continuing to target organizations across their established geographic and sectoral preferences. The group has been linked to 568 public disclosures across our corpus. First observed on a leak site on November 15, 2022; most recent post February 14, 2026. The operation is currently active.

Also tracked as: MedusaLocker.

Timeline of this disclosure

November 7, 2025PT Kalimantan Prima Persada listed by Medusaon the group's public leak site

Records: 1.872 Employees

Sector and geography

This disclosure adds to ransomware activity in the Energy sector, which has 374 disclosures indexed across all operators we track. Geographically, PT Kalimantan Prima Persada is reported in Indonesia, a country with 38 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

PT Kalimantan Prima Persada

Claimed by Medusa · listed 6 months ago

1.872 Employees

Records

Age

since listed · data leaked

Status timeline

Listed
Nov 7, 2025
Data leaked

At a glance

Group: Medusa
Status: Data leaked
Country: Indonesia
Sector: Energy
Listed on leak site: Nov 7, 2025
Records: 1.872 Employees

About the victim

AI dossier — public-source company profile

PT Kalimantan Prima Persada (KPP) is an Indonesian company operating in the coal mining and energy sector, based in Kalimantan, Indonesia. The company is involved in coal extraction and related services in one of Indonesia's primary coal-producing regions. Limited additional detail is verifiable from the available sources.

Industry: Coal Mining & Energy

Attack summary

Severity: high — The disclosure status is 'data_published', indicating Medusa claims to have exfiltrated and released company data. Coal mining and energy sector breaches in Indonesia carry significant operational and business sensitivity, and published data from an energy company warrants a high severity rating even without confirmed PII scale details.

The Medusa ransomware group claims to have attacked PT Kalimantan Prima Persada and the disclosure status is listed as data_published, indicating the group asserts it has exfiltrated and published data from the victim. The specific nature of the data and volume are not confirmed from the truncated leak post.

high

What the group claims

PT Kalimantan Prima Persada (KPP) is a subsidiary of PT Pamapersada Nusantara (PAMA), a leading mining company in Asia. 99,99% shares composition of KPP owned by PT Pamapersada Nusantara and 0.01% by PT United Tractors Pandu Engineering. KPP was freshly born to realize a mining developer concept by establishing a new company to broaden market, offer services engaged in coal mining, started from exploration to sales and to service the booming, small and medium coal mining industry in Kalimantan. Ever since year 2003, KPP has established itself as PAMA'S NEXT GENERATION. The main operation is located in South Kalimantan and East Kalimantan. KPP are proud to contribute to the job market, create business opportunities for local entrepreneurs, as well as the implementation of various CSR programs. The improvement of Human Resources, the correct application of technology, professional management systems and the commitment towards safety at work, and nature preservation will always be the priorities. KPP aims to provide the best result for the stakeholders. In the future, KPP will become a prominent company as well as a trustworthy and reliable partner in the coal mining industry. company is headquartered in Jl. Rawa Gelam I No. 9, Kawasan Industri Pulogadung, Jakarta Timur 13930, DKI Jakarta, Indonesia. 1,872 Employees

The leak post

captured from the group's site

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Sources

Leak posthttp://xfv4jzckytb4g3ckwemcny3ihv4i5p4lqzdpi624cxisu35my5fwi5qd.onion/detail?id=02abc9bfd089259633b48c0009afb622

Source

Indexed 6 months 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.