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BT Group plc (British Telecom)

listed as btci.com · Claimed by Black Basta · listed 2 years ago

500 GB
Data size
3. Users records
18m
Age
since listed · data leaked

Status timeline

  1. ListedDec 4, 2024
  2. Data leakeddate unknown

At a glance

Group
Black Basta
Status
Data leaked
Country
United Kingdom
Sector
Technology
Listed on leak site
Dec 4, 2024
Data size
500 GB
Records
3. Users

About the victim

AI dossier — public-source company profile

BT Group plc, formerly British Telecommunications plc, is one of Europe's leading providers of telecommunications services. The company operates multiple conferencing and communication platforms serving enterprise and consumer markets across the United Kingdom and beyond.

Industry
Telecommunications

Attack summary

Severity: critical — BT Group is a major European telecommunications provider. Confirmed exfiltration of 500 GB including financial data, user personal information, and confidential business documents represents large-scale exposure of sensitive and regulated data affecting a critical infrastructure operator.

BlackBasta claims to have exfiltrated approximately 500 GB of data from BT Group, including financial records, organizational data, user information, and confidential documentation subject to NDAs.

critical

Data the group says was taken

AI dossier — extracted from the leak post
  • Financial data
  • Organizational data
  • User data and personal documents
  • NDAs and confidential agreements

What the group claims

BT Group plc (formerly British Telecommunications plc, abbreviated to British Telecom) is one of Europe’s leading providers of telecommunications services.SITE: www.btci.com | www.btconferencing.comALL DATA SIZE: ≈500gb 1. Finacial data 2. Organisation data 3. Users data and personal docs 4. NDA’s, Confidential data & etc…

Sources

Source

Indexed 2 years 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 Black Basta

Black Basta is a financially motivated ransomware group that emerged in April 2022 and has since compromised approximately 800 organizations worldwide. The group operates as a Ransomware-as-a-Service (RaaS) model with suspected ties to the now-defunct Conti ransomware operation, though their exact country of origin remains unconfirmed by law enforcement agencies. Black Basta primarily gains initial access through phishing campaigns, exploitation of known vulnerabilities, and credential stuffing attacks, subsequently deploying their custom ransomware that employs ChaCha20 encryption algorithm and employs double extortion tactics by exfiltrating sensitive data before encryption and threatening to publish it on their leak site if ransom demands are not met. The group has demonstrated a preference for targeting organizations in the United States, United Kingdom, Germany, Canada, and Italy, with a particular focus on business services, manufacturing, technology, healthcare, and agriculture sectors. Notable victims have included various healthcare systems and manufacturing companies, though specific ransom amounts and high-profile attacks have not been widely disclosed in public law enforcement advisories. As of 2024, Black Basta remains an active threat with continued operations and regular updates to their leak site indicating ongoing compromise activities. The group has been linked to 1,323 public disclosures across our corpus. First observed on a leak site on April 26, 2022; most recent post January 11, 2025. The operation is currently inactive.

Also tracked as: BlackBasta.

Timeline of this disclosure

  • December 4, 2024btci.com listed by Black Bastaon the group's public leak site
Data size
500 GB
Records
3. Users

Other recent disclosures by Black Basta

Black Basta has been linked to 1,323 public victims on Darkfield. A sample of the most recent:

See the full Black Basta dossier →

Sector and geography

This disclosure adds to ransomware activity in the Technology sector, which has 3,544 disclosures indexed across all operators we track. Geographically, btci.com is reported in United Kingdom, a country with 1,217 ransomware disclosures in our corpus.

If your organisation is affected

A listing by Black Basta means btci.com 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, NCSC (United Kingdom), as required for your jurisdiction.
  • Monitor for the data appearing on Black Basta'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.