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

February 20, 2026Graymatter listed by sinobion the group's public leak site

Sector and geography

This disclosure adds to ransomware activity in the Not Found sector, which has 4,859 disclosures indexed across all operators we track. Geographically, Graymatter is reported in United Kingdom, a country with 902 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

GrayMatter (graymatter.co.in)

listed as Graymatter · Claimed by sinobi · listed 3 months ago

Age

since listed · data leaked

Status timeline

Listed
Feb 20, 2026
Data leaked

At a glance

Group: sinobi
Status: Data leaked
Country: United Kingdom
Sector: Not Found
Listed on leak site: Feb 20, 2026

About the victim

AI dossier — public-source company profile

GrayMatter is a Bangalore-based IT company founded in 2006, specialising in data analytics, artificial intelligence, and Business Intelligence solutions. The company serves airport, retail, and manufacturing sectors with flagship products including Skateboard (airport/passenger analytics) and StoreSense (retail revenue and parking management). It operates primarily under the domain graymatter.co.in.

Industry: Data Analytics, AI & Business Intelligence Software
Address: Bangalore, India
Founded: 2006

Attack summary

Severity: high — Data has been published (not merely listed), indicating confirmed exfiltration of business data from an IT/analytics company with access to client data across airport, retail, and manufacturing sectors, implying potential exposure of sensitive business and operational information.

The Sinobi ransomware group claims to have compromised GrayMatter and has published data (disclosed status: data_published), though the specific nature of exfiltrated data and volume are not detailed in the leak post.

high

Data the group says was taken

AI dossier — extracted from the leak post

Business data
Internal company files

What the group claims

GrayMatter (graymatter.co.in) is a Bangalore-based IT company founded in 2006, specializing in data analytics, AI, and Business Intelligence (BI) with a strong focus on the airport, retail, and manufacturing sectors. Their flagship products, including Skateboard and StoreSense, deliver specialized, AI-driven insights for improved passenger experience, retail revenue, and parking management.

Sources

Victim sitewww.graymatter.com
Leak posthttp://sinobi6ftrg27d6g4sjdt65malds6cfptlnjyw52rskakqjda6uvb7yd.onion/leaks/69976d5b6387a4c9a216b71e

Source

Indexed 3 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.