Was Optimum Window Manufacturing hit by ransomware?

Optimum Window Manufacturing 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 Optimum Window Manufacturing breach?

sinobi published data attributed to Optimum Window Manufacturing. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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Optimum Window Manufacturing

Claimed by Sinobi · listed 7 months ago

Age

since listed · data leaked

Status timeline

ListedDec 18, 2025
Data leakeddate unknown

At a glance

Group: Sinobi
Status: Data leaked
Country: United States
Sector: Manufacturing
Listed on leak site: Dec 18, 2025

About the victim

AI dossier — public-source company profile

Optimum Window Manufacturing is described as the largest and most diversified manufacturer of steel windows and doors in the United States. The company produces custom high-tech metal systems for commercial and high-end residential applications, including fire-rated and non-rated steel windows and doors, aluminum, bronze, and stainless steel options. Operating since 1985, Optimum works closely with architects to deliver precision-crafted, custom designs.

Industry: Steel Windows & Doors Manufacturing
Founded: 1985

Attack summary

Severity: medium — Data is marked as published, indicating confirmed exfiltration and disclosure, but the leak post provides no specifics on data type, volume, or sensitivity, and no regulated/PII-scale or critical infrastructure impact is stated.

The ransomware group Sinobi claims to have compromised Optimum Window Manufacturing, with the disclosure status indicating data has been published. No specific details on encryption or the volume/type of exfiltrated data were provided in the leak post.

medium

Data the group says was taken

AI dossier — extracted from the leak post

Unspecified company data

What the group claims

Optimum Window Mfg is the largest and most diversified manufacturer of steel windows and doors in the United States, offering custom high-tech metal systems for commercial and high-end residential applications since 1985. The company specializes in a wide range of products including fire-rated and non-rated steel windows and doors, aluminum windows and doors, as well as bronze and stainless steel options. Optimum collaborates closely with architects to create custom designs that merge performance, structural integrity, and aesthetic appeal. Their mission emphasizes the importance of precision craftsmanship and technology to deliver unique, high-quality products tailored to their clients' specifications.

Sources

Source

Indexed 7 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

December 18, 2025Optimum Window Manufacturing 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 Manufacturing sector, which has 3,681 disclosures indexed across all operators we track. Geographically, Optimum Window Manufacturing 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 Optimum Window Manufacturing 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.