Was Sheyenne Tooling & Manufacturing hit by ransomware?

Sheyenne Tooling & Manufacturing was listed by the Sarcoma ransomware operation (United States), 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 Sheyenne Tooling & Manufacturing breach?

Sarcoma published data attributed to Sheyenne Tooling & Manufacturing (~134 GB). Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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Sheyenne Tooling & Manufacturing

Claimed by Sarcoma · listed 2 years ago

134 GB

Data size

18m

Age

since listed · data leaked

Status timeline

ListedJan 10, 2025
Data leakeddate unknown

At a glance

Group: Sarcoma
Status: Data leaked
Country: United States
Sector: Manufacturing
Listed on leak site: Jan 10, 2025
Data size: 134 GB

About the victim

AI dossier — public-source company profile

Sheyenne Tooling & Manufacturing is a family-owned precision component manufacturer based in Cooperstown, North Dakota, founded in 1977. They design and manufacture specialized attachments for skid steers and tractors, as well as contract manufacturing services for multiple industries including automotive, aerospace, and agricultural sectors.

Industry: Agricultural & Construction Equipment Manufacturing
Address: Cooperstown, North Dakota, United States
Founded: 1977

Attack summary

Severity: high — Confirmed exfiltration and publication of 134 GB of data including structured databases (SQL) and business files from a manufacturing company. Scale and database content indicate significant business intelligence exposure.

Sarcoma claims to have exfiltrated 134 GB of data including files and SQL databases from Sheyenne Tooling & Manufacturing. The group has published the data on their leak site.

high

Data the group says was taken

AI dossier — extracted from the leak post

SQL databases
Business files
Company records

What the group claims

Sheyenne Tooling & Manufacturing Sheyenne Tooling & Manufacturing of Cooperstown, North Dakota was founded in 1977 with the goal of becoming a highly regarded regional tool and die manufacturer. Since then, the family owned business has established a reputation as a precision component manufacturer for some of the biggest names in American agriculture including Bobcat, John Deere and CNH. Our Tele-Boom, Tele-Fork, Double Quick Tach Grapple and the rest of our short line of unique and innovative skidsteer attachments are designed and built to meet our customers high quality and performance expectations.Geo: USA - Leak size: 134 GB Archive - Contains: Files, SQL

Sources

Victim sitesheyennemfg.com

Source

Indexed 2 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.

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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

January 10, 2025Sheyenne Tooling & Manufacturing listed by Sarcomaon the group's public leak site

Data size: 134 GB

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

This disclosure adds to ransomware activity in the Manufacturing sector, which has 3,681 disclosures indexed across all operators we track. Geographically, Sheyenne Tooling & Manufacturing is reported in United States, a country with 11,033 ransomware disclosures in our corpus.

If your organisation is affected

A listing by Sarcoma means Sheyenne Tooling & Manufacturing 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.
Report the incident to your national CERT, CISA (United States), as required for your jurisdiction.
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.