Was Comcast hit by ransomware?

Comcast was listed by the Spacebears 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 Spacebears ransomware group?

Spacebears 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 Comcast breach?

Spacebears published data attributed to Comcast. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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Comcast

Claimed by Spacebears · listed 7 months ago

Age

since listed · data leaked

Status timeline

ListedDec 8, 2025
Data leakeddate unknown

At a glance

Group: Spacebears
Status: Data leaked
Country: United States
Sector: Telecommunication
Listed on leak site: Dec 8, 2025

About the victim

AI dossier — public-source company profile

Comcast Corporation is one of the largest telecommunications and media conglomerates in the United States, headquartered in Philadelphia, Pennsylvania. It provides cable television, internet, and telephone services under the Xfinity brand, and also owns NBCUniversal. Comcast serves tens of millions of residential and business customers across the country.

Industry: Telecommunications & Cable Services
Address: One Comcast Center, Philadelphia, PA 19103, United States
Employees: 186000
Founded: 1963

Attack summary

Severity: medium — Status is listed as data_published, which implies some data disclosure has occurred, but there is a significant mismatch between the named victim (Comcast) and the leak post content (Johnson & Johnson Innovative Medicine), no data size is provided, and no specific proof files or confirmed sensitive data inventory is described, reducing confidence in the actual impact.

The Spacebears group has listed Comcast under a disclosed/data-published status; however, the leak post content describes Johnson & Johnson Innovative Medicine (formerly Janssen Pharmaceuticals) rather than Comcast, suggesting a mismatch between the victim label and the post content. No specific exfiltration volume or ransom demand is stated.

medium

Data the group says was taken

AI dossier — extracted from the leak post

Pharmaceutical research data (per post content)
Corporate business data (inferred)

What the group claims

As a global media and tech company, Comcast reaches hundreds of millions of customers, viewers, and guests with world-class connectivity and platforms and beloved content and experiences.The leak was made possible by Quasar Inc., a company that prepares technical documentation for Comсast and its Genesis project. The files contain design documentation for numerous cities, as well as detailed utility plans. https://corporate.comcast.com/

The leak post

captured from the group's site

## Johnson & Johnson Innovative Medicine
Johnson & Johnson Innovative Medicine (formerly known as Janssen Pharmaceuticals) is the pharmaceutical division of the American corporation Johnson & Johnson, specializing in the development and production of revolutionary medicines. The company focuses on creating treatments for the most complex diseases, transforming the future of healthcare.

Sources

Victim sitecorporate.comcast.com
Leak posthttp://5butbkrljkaorg5maepuca25oma7eiwo6a2rlhvkblb4v6mf3ki2ovid.onion/companies/102/comcast

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 Spacebears

Spacebears is a recently emerged ransomware group first observed in April 2024, operating with apparent financial motivations and demonstrating a broad targeting approach across multiple sectors and geographic regions. The group's origin and potential affiliations remain unclear due to limited public documentation from established threat intelligence sources, though their targeting pattern suggests a professional operation focused on maximizing financial returns rather than geopolitical objectives. With 117 known victims since their emergence, Spacebears has shown particular focus on organizations in the United States, Germany, Spain, Italy, and Canada, with their attacks primarily affecting technology, healthcare, manufacturing, and business services sectors, indicating they likely employ opportunistic targeting rather than sector-specific specialization. Their attack methodology, initial access vectors, and specific technical capabilities have not been extensively documented in public reporting from major cybersecurity firms or law enforcement agencies, limiting detailed analysis of their operational procedures and tools. Due to the group's recent emergence and limited public intelligence reporting, notable high-profile campaigns and specific victim details remain largely undocumented in established threat intelligence channels. The group's current operational status appears active given their recent emergence timeline, though comprehensive analysis is constrained by the lack of detailed public reporting from authoritative cybersecurity sources. The group has been linked to 185 public disclosures across our corpus. First observed on a leak site on April 29, 2024; most recent post July 13, 2026. The operation is currently active.

Also tracked as: space bears.

Timeline of this disclosure

December 8, 2025Comcast listed by Spacebearson the group's public leak site

Other recent disclosures by Spacebears

Spacebears has been linked to 185 public victims on Darkfield. A sample of the most recent:

See the full Spacebears dossier →

Sector and geography

This disclosure adds to ransomware activity in the Telecommunication sector, which has 172 disclosures indexed across all operators we track. Geographically, Comcast is reported in United States, a country with 11,033 ransomware disclosures in our corpus.

If your organisation is affected

A listing by Spacebears means Comcast 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 Spacebears'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.