Was Ju Percussion Group hit by ransomware?

Ju Percussion Group was listed by the Sarcoma ransomware operation (Taiwan), and stolen data was published on the group's leak site. Darkfield tracks this disclosure with the original leak post, screenshot and group context.

Who is the Sarcoma ransomware group?

Sarcoma is a ransomware operator tracked by Darkfield. See the full operator dossier for its known victims, sectors targeted, IOCs and leak-site infrastructure.

What data was leaked in the Ju Percussion Group breach?

Sarcoma published data attributed to Ju Percussion Group (~1.6 TB). Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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Ju Percussion Group

Claimed by Sarcoma · listed 1 year ago

1.6 TB

Data size

15m

Age

since listed · data leaked

Status timeline

ListedApr 17, 2025
Data leakeddate unknown

At a glance

Group: Sarcoma
Status: Data leaked
Country: Taiwan
Listed on leak site: Apr 17, 2025
Data size: 1.6 TB

About the victim

AI dossier — public-source company profile

Ju Percussion Group is a Taiwan-based professional percussion ensemble and music education organization founded in 1986. The group operates an international instruction system with approximately 30 percussion schools worldwide and has trained over 130,000 percussion learners across 33 countries.

Industry: Music Education & Performance
Address: Taipei, Taiwan
Founded: 1986

Attack summary

Severity: medium — 1.6 TB data exfiltration confirmed and published. Potential exposure of student/personal information from 130,000+ learners, though sensitivity level and regulatory compliance context (GDPR, CCPA, Taiwan DPA) remain unclear. No stated operational disruption.

The Sarcoma ransomware group claims to have exfiltrated 1.6 TB of data from Ju Percussion Group. The post indicates data was published but does not specify the nature of exfiltrated files or operational encryption.

medium

Data the group says was taken

AI dossier — extracted from the leak post

business records
student/learner data
organizational files

What the group claims

Ju Percussion Group To date, the group has played in 33 different countries around the world, and cultivated more than 130,000 percussion learners by means of its instruction system. The growth of the Ju Percussion Group is a reflection of the development of contemporary percussion on the island of Taiwan. In 1986, the Ju Percussion Group met at a hot pot restaurant in Taipei and announced to the world that Taiwan's very first professional percussion band had been born. When the Ju Percussion Group was first established, most people in Taiwan were unfamiliar with its percussion music genre. Thanks to the group's activities, however, the Ju Percussion Group soon became a household name throughout the island. In 1991, the Ju Percussion Group introduced its instruction system, which swept the country with its absorbing and authentic teaching format. At present, there are 30 existing percussion music schools around the worldGeo: Taiwan - Leak size: 1.6 TB Archive - Contains: Files

Source

Indexed 1 year 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.

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Disclosure context

About Sarcoma

Sarcoma is a relatively new ransomware group that emerged in October 2024, operating with apparent financial motivations and demonstrating a broad international targeting approach with at least 140 documented victims across multiple countries and industry sectors. The group's origin and affiliations remain unclear due to its recent emergence, with no publicly documented connections to established ransomware families or confirmation of whether they operate as an independent entity or through a Ransomware-as-a-Service model. Limited public information is available regarding Sarcoma's specific attack methodologies, initial access vectors, or technical capabilities, though their targeting patterns suggest opportunistic rather than highly selective victim selection across diverse industries including manufacturing, business services, agriculture and food production, and technology sectors. The group has shown a particular focus on victims in the United States while also maintaining operations against targets in Italy, Canada, Germany, and Australia, though no specific high-profile attacks or record ransom demands have been publicly documented by major security firms or law enforcement agencies. Given the group's recent emergence in late 2024, Sarcoma appears to remain active with no reported law enforcement disruptions or confirmed rebranding activities at this time. The group has been linked to 150 public disclosures across our corpus. First observed on a leak site on October 9, 2024; most recent post May 12, 2026. The operation is currently active.

Also tracked as: Sarcoma Ransomware Group.

Timeline of this disclosure

April 17, 2025Ju Percussion Group listed by Sarcomaon the group's public leak site

Data size: 1.6 TB

Other recent disclosures by Sarcoma

Sarcoma has been linked to 150 public victims on Darkfield. A sample of the most recent:

See the full Sarcoma dossier →

Sector and geography

Geographically, Ju Percussion Group is reported in Taiwan, a country with 71 ransomware disclosures in our corpus.

If your organisation is affected

A listing by Sarcoma means Ju Percussion Group appeared on a ransomware extortion site and data attributed to it has been published. If this is your organisation, or a supplier you depend on, the priority is to confirm the intrusion and contain it before the window to act closes.

Engage your incident-response team and preserve forensic evidence before remediating — do not wipe affected systems first.
Force a password reset and revoke active sessions for exposed accounts; rotate any credentials, API keys or certificates that may have been in the stolen data.
Assess regulatory notification duties (GDPR, NIS2, sector regulators) — many carry a 72-hour reporting clock from awareness.
Monitor for the data appearing on Sarcoma's leak site and across paste and breach channels, and brief downstream partners who may be exposed through you.

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.