Was Wesley Heating & Cooling hit by ransomware?

Wesley Heating & Cooling was listed by the sinobi 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 sinobi ransomware group?

sinobi 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 Wesley Heating & Cooling breach?

sinobi published data attributed to Wesley Heating & Cooling. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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Wesley Heating & Cooling

Claimed by Sinobi · listed 6 months ago

Age

since listed · data leaked

Status timeline

ListedJan 5, 2026
Data leakeddate unknown

At a glance

Group: Sinobi
Status: Data leaked
Country: United States
Sector: Consumer Services
Listed on leak site: Jan 5, 2026

About the victim

AI dossier — public-source company profile

Wesley Heating & Cooling is an HVAC company based in Green Bay, Wisconsin, in operation since 1951. They specialize in heating, cooling, and air conditioning services including repair, replacement, and maintenance of geothermal heat pumps, ductless mini-splits, and other systems. Their service area covers Green Bay, Oshkosh, Fond du Lac, and surrounding communities, primarily serving residential homeowners.

Industry: HVAC Services
Address: Green Bay, Wisconsin, United States
Founded: 1951

Attack summary

Severity: medium — Data has been published (disclosed status: data_published), indicating confirmed exfiltration, but no specific data types, volume, or sensitive regulated data categories (e.g., PII at scale, medical, financial) are described in the post, and the victim is a small regional HVAC services company.

The group 'sinobi' claims an attack on Wesley Heating & Cooling with a disclosed status of data_published, indicating data has been exfiltrated and published. No specific details on encryption or the exact nature of published data are provided in the post.

medium

What the group claims

Wesley Heating & Cooling is an HVAC company based in Green Bay, Wisconsin, specializing in heating, cooling, and air conditioning services since 1951. They offer repair, replacement, and maintenance services for various heating and cooling systems, including geothermal heat pumps and ductless mini-splits. Their intended clients include homeowners in Green Bay, Oshkosh, Fond du Lac, and surrounding areas, looking for reliable and efficient HVAC solutions. Wesley Heating & Cooling is committed to customer satisfaction, providing community service, maintenance plans, and financing options for new installations.

Sources

Source

Indexed 6 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.

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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

January 5, 2026Wesley Heating & Cooling listed by sinobion the group's public leak site

Other recent disclosures by sinobi

sinobi has been linked to 274 public victims on Darkfield. A sample of the most recent:

See the full sinobi dossier →

Sector and geography

This disclosure adds to ransomware activity in the Consumer Services sector, which has 829 disclosures indexed across all operators we track. Geographically, Wesley Heating & Cooling is reported in United States, a country with 11,033 ransomware disclosures in our corpus.

If your organisation is affected

A listing by sinobi means Wesley Heating & Cooling 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 sinobi'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.