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AT&T

Claimed by EndZone · listed 5 hours ago

Today
Age
since listed · data leaked

Status timeline

  1. ListedSep 18, 2026
  2. Data leakeddate unknown

At a glance

Group
EndZone
Status
Data leaked
Country
United States
Sector
Technology
Listed on leak site
Sep 18, 2026

About the victim

AI dossier — public-source company profile

AT&T is a major U.S. telecommunications company with annual revenue of $125.6 billion, providing wireless, wireline, and digital entertainment services including DirecTV.

Industry
Telecommunications

Attack summary

Severity: high — Confirmed exfiltration of internal infrastructure credentials and access to enterprise systems (VDI, VPN, Salesforce). Prolonged undetected access to critical telecommunications infrastructure represents significant operational and data security risk, though no specific regulated/PII datasets are explicitly named.

EndZone claims initial access via a contractor vulnerability (CX/TORCH patch), followed by prolonged unauthorized access to external and internal VPN and virtual desktop instances. The group accessed certificates from VDI environments and Salesforce data via compromised contractor and project manager accounts, exploiting inadequate detection and incident response.

high

Data the group says was taken

AI dossier — extracted from the leak post
  • VDI certificates
  • VPN access credentials
  • Salesforce project data
  • Internal MyDesktop instances

What the group claims

Revenue: $125.6 billion Initial access was via a CX contractor doing business with AT&T. Access originally used as vehicle for Equipment Changes/Call Forwarding (thanks a lot TORCH patch) - VPN + HVD (both external and internal MyDesktop) instances were accessed for a prolonged period without any detection or incident response taking place. Certificates exported from certlm in the VDI + OPUS self installer (automatically joins EP to S1) opened up the door to the VPN. Salesforce data was accessed via a project manager ATTUID + a DirecTV contractor who for some reason had the apps available in Salesforce. AT&T CSO, if you are reading this, you are to contact us ASAP!

Sources

Source

Indexed 5 hours 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 EndZone

EndZone is a ransomware group first observed in September 2026, operating with an apparent financial motivation based on its targeting profile, though limited public documentation exists given its early stage of activity. The group has claimed two known victims to date, with targeting concentrated in the United States across the Government and Defense and Technology sectors, suggesting a deliberate focus on high-value organizations likely to possess sensitive data and the financial resources or political pressure to meet ransom demands. Due to the group's nascent operational history and limited victim count, no detailed technical attribution, affiliation, or country of origin has been publicly established by CISA, the FBI, Mandiant, or other reputable security research organizations at this time. Similarly, specific details regarding initial access vectors, tooling, encryption methodology, or extortion tactics have not yet been publicly documented, though the targeting of government and defense entities is consistent with broader ransomware trends involving double extortion and data exfiltration pressure. No notable high-profile campaigns, law enforcement actions, or confirmed ransom figures have been publicly attributed to EndZone as of the time of this profile, and the group should be considered an emerging threat actor under continued monitoring given its sector targeting patterns. The group has been linked to 2 public disclosures across our corpus. First observed on a leak site on September 18, 2026. The operation is currently active.

Timeline of this disclosure

  • September 18, 2026AT&T listed by EndZone on the group's public leak site

Other recent disclosures by EndZone

EndZone has been linked to 2 public victims on Darkfield. A sample of the most recent:

See the full EndZone dossier →

Sector and geography

This disclosure adds to ransomware activity in the Technology sector, which has 3,579 disclosures indexed across all operators we track. Geographically, AT&T is reported in United States, a country with 3,167 ransomware disclosures in our corpus.

If your organisation is affected

A listing by EndZone means AT&T 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 EndZone'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.