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 19, 2026Mayfair Hotels & Resorts listed by sinobion the group's public leak site

Sector and geography

This disclosure adds to ransomware activity in the Hospitality and Tourism sector, which has 159 disclosures indexed across all operators we track. Geographically, Mayfair Hotels & Resorts is reported in India, a country with 255 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

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Mayfair Hotels & Resorts

Claimed by sinobi · listed 3 months ago

Age

since listed · data leaked

Status timeline

Listed
Feb 19, 2026
Data leaked

At a glance

Group: sinobi
Status: Data leaked
Country: India
Sector: Hospitality and Tourism
Listed on leak site: Feb 19, 2026

About the victim

AI dossier — public-source company profile

MAYFAIR Hotels & Resorts is a premier luxury hospitality chain headquartered in Bhubaneswar, Odisha, India, founded in 1982 by Shri Dilip Ray. The group operates over 17 premium properties across India, including resorts in Darjeeling, Gangtok, Goa, Puri, Guwahati, and other locations, blending modern luxury with local cultural heritage. The chain offers accommodations, fine dining, wellness, and event/wedding venues across diverse geographic settings including beaches, mountains, and heritage sites.

Industry: Luxury Hospitality & Resorts
Address: Bhubaneswar, Odisha, India
Founded: 1982

Attack summary

Severity: high — Data has been published (data_published status), indicating confirmed exfiltration. A luxury hotel chain holds significant volumes of guest PII, payment-related records, and corporate data across 17+ properties, making the exposure of meaningful sensitivity and scale.

The ransomware group 'sinobi' claims to have attacked Mayfair Hotels & Resorts and has published data (disclosed status: data_published), though the leak post does not specify whether encryption, exfiltration, or both occurred, nor does it state the volume of data involved.

high

Data the group says was taken

AI dossier — extracted from the leak post

Guest personal information
Hotel operational records
Corporate business data
Employee records
Reservation and booking data

What the group claims

MAYFAIR Hotels & Resorts is a premier, award-winning luxury hospitality chain in India, founded in 1982 with its headquarters in Bhubaneswar, Odisha. The group operates over 17 premium properties across India, including resorts in Darjeeling, Gangtok, Goa, and Puri, known for blending modern luxury with local heritage

Sources

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.