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

May 5, 2026Bay State Land Services listed by sinobion the group's public leak site

Sector and geography

This disclosure adds to ransomware activity in the Construction sector, which has 415 disclosures indexed across all operators we track. Geographically, Bay State Land Services is reported in US, a country with 2,713 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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Bay State Land Services

Claimed by sinobi · listed 15 days ago

15d

Age

since listed · data leaked

Status timeline

Listed
May 5, 2026
Data leaked

At a glance

Group: sinobi
Status: Data leaked
Country: US
Sector: Construction
Listed on leak site: May 5, 2026

About the victim

AI dossier — public-source company profile

Bay State Land Services Inc is a company operating in the Architecture, Engineering & Design industry, based in the United States. The firm likely provides land surveying, title, or related engineering and design services given its name and sector classification. No public website content was available to confirm further operational details.

Industry: Land Surveying & Engineering Services

Attack summary

Severity: medium — Data is listed as published (disclosed status: data_published), indicating confirmed exfiltration and public release; however, no details on data volume, sensitivity, or specific categories are available to elevate to high or critical.

The Sinobi ransomware group claims to have attacked Bay State Land Services Inc and has published data, though no specific details on encryption, exfiltration volume, or data categories were provided in the leak post.

medium

What the group claims

Bay State Land Services Inc is a company that operates in the Architecture, Engineering & Design industry.

Sources

Leak posthttp://sinobi23i75c3znmqqxxyuzqvhxnjsar7actgvc4nqeuhgcn5yvz3zqd.onion/leaks/69fa47cc8280ceeb9ae189ed

Source

Indexed 15 days 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.