Was Defiance hit by ransomware?

Defiance 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 Defiance breach?

Sarcoma published data attributed to Defiance (~188 GB). Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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Defiance

Claimed by Sarcoma · listed 1 year ago

188 GB

Data size

14m

Age

since listed · data leaked

Status timeline

ListedMay 4, 2025
Data leakeddate unknown

At a glance

Group: Sarcoma
Status: Data leaked
Country: United States
Sector: Energy
Listed on leak site: May 4, 2025
Data size: 188 GB

About the victim

AI dossier — public-source company profile

Defiance Energy Services, LLC is a water hauling and support services provider for energy producers in the Haynesville Shale formation. Operating since 2008 with approximately 50 vacuum trucks in daily operation, the company serves the oil and gas sector with water transportation, rig cleaning, surface cleaning, and winch services across Louisiana.

Industry: Energy Services & Water Hauling
Address: 415 Texas Street, Suite 400, Shreveport, Louisiana 71101
Employees: 51-200
Founded: 2008

Attack summary

Severity: high — Confirmed exfiltration of 188 GB of business data from an energy sector company. Data likely includes customer information, operational details, and financial records. No indication of regulatory/medical/financial PII at scale, but significant business data exposure.

Sarcoma claims to have exfiltrated 188 GB of data from Defiance Energy Services. The group has published the archived files and advertises them as proof of the breach.

high

Data the group says was taken

AI dossier — extracted from the leak post

Business records
Customer data
Operational files
Employee records
Financial documents

What the group claims

Defiance Defiance Energy Services, LLC provides water hauling and other services to energy producers throughout the Haynesville Shale. We offer low-cost and efficient services that minimize non-productive time for our customers. In business since 2008, we are now one of the largest water haulers in the Haynesville. We run about 50 vacuum truck each day, serving our customers 24/7/365. In all our work, the safety of our employees, customers, and the environment are paramount. To that end, we maintain a rigorous compliance program to exceed all federal, state, and local regulatory requirements. Our combination of efficiency, reliability, and safety make us the right choice for your service needs.Geo: USA - Leak size: 188 GB Archive - Contains: Files

Sources

Victim sitedefiancellc.com

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

May 4, 2025Defiance listed by Sarcomaon the group's public leak site

Data size: 188 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 Energy sector, which has 652 disclosures indexed across all operators we track. Geographically, Defiance 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 Defiance 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.