Disclosure context

About sinobi

Based on the limited publicly available information, Sinobi appears to be a recently emerged ransomware operation first observed in July 2025, with financial motivations evidenced by their targeting of 268 victims across multiple sectors. The group's origin and specific affiliations remain undocumented in public threat intelligence reporting, and there is no confirmed information regarding whether they operate as a Ransomware-as-a-Service model or as an independent entity. Their attack methodology and technical capabilities have not been extensively documented by major security research organizations, though their targeting patterns suggest a broad opportunistic approach rather than highly selective operations. The group demonstrates a preference for targeting organizations in the United States, India, United Kingdom, Canada, and Italy, with a focus on manufacturing, healthcare, construction, and technology sectors, suggesting they may exploit common vulnerabilities across these industries rather than deploying sophisticated, sector-specific attack vectors. No major high-profile campaigns or significant law enforcement actions against Sinobi have been publicly reported by CISA, FBI, or established threat intelligence firms. Given the recent emergence timeline and lack of extensive public documentation, the group's current operational status and long-term trajectory remain unclear, though the substantial victim count suggests continued activity as of the last available reporting period. The group has been linked to 274 public disclosures across our corpus. First observed on a leak site on July 5, 2025; most recent post May 8, 2026. The operation is currently active.

Timeline of this disclosure

March 18, 2026Summa Energy listed by sinobion the group's public leak site

Sector and geography

This disclosure adds to ransomware activity in the Energy sector, which has 374 disclosures indexed across all operators we track. Geographically, Summa Energy 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

← All victims

Summa Energy

Claimed by sinobi · listed 2 months ago

Age

since listed · data leaked

Status timeline

Listed
Mar 18, 2026
Data leaked

At a glance

Group: sinobi
Status: Data leaked
Country: United States
Sector: Energy
Listed on leak site: Mar 18, 2026

About the victim

AI dossier — public-source company profile

Summa Energy Fuel Services specializes in 24/7 on-site fueling solutions, including tank sales and leasing, bulk fueling, and emergency fueling services. The company serves industries such as transportation, logistics, aviation, and infrastructure across the United States. It focuses on customized fuel delivery, pricing optimization, and reliable fuel management for business clients.

Industry: Fuel Services & On-Site Fueling Solutions

Attack summary

Severity: medium — Status is 'data_published' indicating confirmed exfiltration and disclosure, but no specific sensitive regulated data categories (e.g., PII at scale, financial, medical) are enumerated, and data volume is unspecified. Additionally, the public site at www.summaenergy.com corresponds to a different company (a Finnish solar thermal/clean energy firm), casting significant doubt on the correct victim identity and reducing confidence in the full impact assessment.

The ransomware group sinobi claims to have compromised Summa Energy Fuel Services and has published data as part of a disclosed leak. The specific nature of the exfiltrated data and whether encryption occurred is not explicitly detailed in the post.

medium

Data the group says was taken

AI dossier — extracted from the leak post

Business operational data
Client/customer records
Fuel service contracts or agreements

What the group claims

Summa Energy Fuel Services specializes in providing 24/7 on-site fueling solutions, including tank sales and leasing, bulk fueling, and emergency fueling services. They cater to various industries such as transportation, logistics, aviation, and infrastructure, offering customized solutions to meet diverse business needs. The company is dedicated to optimizing fuel delivery and pricing, ensuring timely service and cost savings for their clients. With a strong focus on customer satisfaction and innovative practices, Summa Energy is recognized as a trusted partner for reliable fuel management.

Sources

Victim sitewww.summaenergy.com
Leak posthttp://sinobi6ftrg27d6g4sjdt65malds6cfptlnjyw52rskakqjda6uvb7yd.onion/leaks/69b9978a6387a4c9a2865065

Source

Indexed 2 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.