high severity January 30, 2025 · 3 min read Unverified claim — what this is

FENSTERMAKER Listed by Monti Ransomware Group

If you are a customer of Fenstermaker, here’s what is being claimed, and what it would mean for you.

Fenstermaker was listed on Monti's leak site. Monti claims to have stolen internal data. This is the group's claim, not a confirmed finding.

FENSTERMAKER Listed by Monti Ransomware Group

On January 30, 2025, the monti Ransomware Group added Fenstermaker to its leak site and began publishing what it described as the company’s internal files stolen during a ransomware attack.

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What Public Reporting Shows

Public reporting indicates that the incident involved the exfiltration of internal documents from Fenstermaker, an engineering and environmental services firm. The monti group listed the victim on its dark-web blog and stated that a full leak had occurred. No confirmed total of affected individuals has been released, and the precise volume or sensitivity of the exposed files remains unclear from available reporting. The listing appeared on the group’s onion-site blog, which is tracked by ransomware-monitoring platforms such as ransomware.live.

Why This Matters for You and Your Family

When a company that handles engineering projects, environmental assessments, or government contracts is breached, the stolen files can contain names, addresses, contact details, and project records tied to private citizens. If your home, business, or community project appears in those documents, the information can be cross-referenced with other leaks to build a detailed profile of you and your family. Credential leaks from related employee accounts often follow, increasing the chance that personal email addresses, passwords, or remote-access details end up for sale. For ordinary families this translates into higher risks of identity theft, phishing campaigns, and unwanted exposure of where you live or work.

The Doxxing and Identity-Chain Implications

Ransomware leaks rarely stop at one company. Once internal files surface, threat actors and opportunistic data brokers begin mapping connections between employee names, client contacts, project locations, and any personal details they contain. A single exposed email or phone number can link your professional identity to personal accounts across social media, shopping sites, and children’s gaming platforms. These identity chains allow attackers to move from corporate data to household targeting, turning one breach into repeated harassment, doxxing attempts, or account takeovers. Credential leaks like this one frequently cascade into gaming account compromises because the same passwords or recovery emails are reused by family members, including children.

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What the free scan actually returns

Sample resultyou@email.comIllustrative — not a real person

Found on people-search siteswe remove these

These listings are live, public, and legal to remove — and removing them is what we do.

value redacted in this sampleage, relatives, address historySpokeo

value redacted in this samplephone, household, property recordsBeenVerified

value redacted in this sample580 companies checked

Found in breach recordsverifiedreported — unverified

Each record is labeled: confirmed breach data, or an attacker’s claim no one has verified.

verifiedvalue redacted in this samplepassword + phone · 2024telecom breach

unverifiedvalue redacted in this sampleclaimed in ransomware listing · 2026leak-site claim

Leaked data cannot be deleted from the internet — anyone claiming otherwise is lying. Broker listings can be removed. We do the second, and show you exactly what to fix from the first.

Report details & sourcing

Attributed to Monti · 110 incidents tracked →

Severity High the filing does not enumerate what was exposed

Disclosed January 30, 2025

Last reviewed August 8, 2026

Affected Unconfirmed

By GalaxyWarden Threat Research · Editorial & sourcing standards

Unverified claim — what this report is

This page documents a public listing on a ransomware/extortion group’s leak site, tracked via public threat-intelligence sources. A listing is the attacker’s claim. GalaxyWarden aggregates and reports such claims; we have not independently verified that a breach occurred, what data (if any) was taken, or the accuracy of anything the group asserts, and the named organisation has not necessarily confirmed the incident. Sections above describe what the listing shows and the group’s documented history — not verified findings about the named organisation. If you represent this organisation and believe anything here is inaccurate, tell us and we’ll review it promptly.

Editorial & sourcing policy

GalaxyWarden is a breach-monitoring service and news aggregator. We do not exfiltrate, host, purchase, or redistribute stolen data. Breach information is compiled from publicly accessible sources and threat-intelligence platforms, and is reported as claims attributed to their source. We promptly correct or remove material shown to be inaccurate — see our content & takedown policy or write to support@galaxywarden.com.

Threat-actor tracker

Monti — 110 incidents tracked

Every breach we've attributed to Monti, in one running log. See who else they've hit →

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