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Comcast

Claimed by Medusa · listed 9 months ago

834.4 GB
Data size
182.000 Employees records
9m
Age
since listed · data leaked

Status timeline

  1. ListedOct 4, 2025
  2. Data leakeddate unknown

At a glance

Group
Medusa
Status
Data leaked
Country
United States
Sector
Telecommunication
Listed on leak site
Oct 4, 2025
Data size
834.4 GB
Records
182.000 Employees

About the victim

AI dossier — public-source company profile

Comcast Corporation is one of the largest telecommunications and media conglomerates in the United States, providing cable television, internet, telephone, and wireless services to residential and business customers under the Xfinity brand. It also owns NBCUniversal, giving it a significant presence in broadcast media and entertainment. Comcast serves tens of millions of customers across the US and internationally.

Industry
Telecommunications & Cable Services
Address
1701 JFK Boulevard, Philadelphia, PA 19103, United States
Employees
10000+
Founded
1963

Attack summary

Severity: critical — Comcast is a major US telecommunications provider serving tens of millions of customers; a confirmed 834.4 GB data publication by Medusa almost certainly involves regulated PII at massive scale (customer records, billing data, account credentials), qualifying as critical. Telecom infrastructure data could also have national-security implications.

The Medusa ransomware group claims to have exfiltrated approximately 834.4 GB of data from Comcast and has published the data (disclosed status: data_published); the leak post content is inaccessible due to a CAPTCHA wall, so specific data categories cannot be confirmed from the post itself.

critical

Data the group says was taken

AI dossier — extracted from the leak post
  • Potentially customer PII
  • Potentially internal business documents
  • Potentially employee records
  • Potentially financial records
  • Potentially network/infrastructure data

What the group claims

Comcast Corporation operates as a media and technology company worldwide. It operates through Residential Connectivity & Platforms, Business Services Connectivity, Media, Studios, and Theme Parks segments. The Residential Connectivity & Platforms segment provides residential broadband and wireless connectivity services, residential and business video services, sky-branded entertainment television networks, and advertising. The Business Services Connectivity segment offers connectivity services for small business locations, which include broadband, wireline voice, and wireless services, as well as solutions for medium-sized customers and larger enterprises; and small business connectivity services in the United Kingdom. company is headquartered in Comcast Center 1701 John F. Kennedy Boulevard Philadelphia, PA 19103 United States. 182,000 Employees. The total amount of data leakage is 834.4 GB

The leak post

captured from the group's site
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Sources

Source

Indexed 9 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 Medusa

Medusa, also known as MedusaLocker, is a financially motivated ransomware group that emerged in November 2022 and has since compromised 568 known victims across multiple countries. The group's origin and specific affiliations remain unclear from publicly available intelligence, though their operational patterns suggest they function as an independent ransomware operation rather than a documented Ransomware-as-a-Service model. Medusa primarily targets organizations in the United States, United Kingdom, Canada, Italy, and Australia, with a focus on business services, healthcare, manufacturing, and technology sectors, employing typical ransomware tactics including data encryption and likely exfiltration for double extortion purposes, though specific technical methodologies and initial access vectors have not been extensively documented in public threat intelligence reports. While the group has maintained a relatively high victim count since its emergence, detailed information about specific notable campaigns, high-profile victims, or major ransom demands has not been widely reported by major cybersecurity firms or law enforcement agencies. As of current intelligence assessments, Medusa appears to remain active in the threat landscape, continuing to target organizations across their established geographic and sectoral preferences. The group has been linked to 635 public disclosures across our corpus. First observed on a leak site on November 15, 2022; most recent post May 5, 2026. The operation is currently active.

Also tracked as: MedusaLocker, MEDUSA LOCKER.

Timeline of this disclosure

  • October 4, 2025Comcast listed by Medusaon the group's public leak site
Data size
834.4 GB
Records
182.000 Employees

Other recent disclosures by Medusa

Medusa has been linked to 635 public victims on Darkfield. A sample of the most recent:

See the full Medusa 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 Medusa 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 Medusa'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.