high severity February 19, 2025 · 3 min read Unverified claim — what this is

horizonmedia.com Listed by Chaos Ransomware Group

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

Official Announcement: Horizon Media Data Breach ULTIMATUM: Horizon Media has 48 hours to reach an agreement. If our terms are not met, a full leak consisting of 3.2 TB of sensitive corporate data will be made public and distributed to global media outlets and regulatory bodies. The leaked dataset…
— from Chaos’s own leak-site posting. This is the group’s claim, quoted verbatim; it is not GalaxyWarden’s reporting and has not been independently verified.

horizonmedia.com Listed by Chaos Ransomware Group

On February 19, 2025, the Chaos ransomware group listed advertising agency Horizon Media on its leak site and gave the company 48 hours to negotiate or face the public release of 3.2 TB of internal files.

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What Public Reporting Shows

Public reporting indicates that Horizon Media, a large independent media services company, suffered a ransomware intrusion in which attackers exfiltrated internal corporate data. The Chaos group posted proof of the breach on its dark-web leak page, threatening to distribute the full 3.2 TB dataset to media outlets and regulators if demands are not met. Available reporting describes the exposed material as sensitive internal files although the exact records have not been independently verified by third parties. No confirmed victim count for individual employees or clients has been published.

Why This Matters for You and Your Family

When a company that handles advertising, media buying, or client campaigns is breached, the information stolen often includes contracts, employee records, vendor lists, and personal details that can be traced back to ordinary people. If your employer, your doctor’s office, your child’s school, or any service you use works with Horizon Media, your data may now sit inside that 3.2 TB bundle. Once files reach public leak sites, they spread quickly and stay available for years. You and your family can face identity theft, phishing campaigns, or targeted scams long after the initial headline fades.

The Doxxing and Identity-Chain Implications

Ransomware leaks rarely stop at corporate spreadsheets. A single exposed email or phone number can link your work account to personal logins, social-media handles, and family addresses. Attackers and opportunistic criminals then build “identity chains” that connect one breach to the next. Credential leaks like this one frequently cascade into account takeovers on email, banking, and gaming platforms. Children’s gaming accounts are especially vulnerable because kids often reuse usernames or email addresses tied to a parent’s breached work domain. The result is doxxing that can expose home addresses, family relationships, and daily routines.

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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 Chaos · 100 incidents tracked →

Severity High the filing does not enumerate what was exposed

Disclosed February 19, 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

Chaos — 100 incidents tracked

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

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