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Cyber Threat
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Ransomware victim Technology

TMobile

Listed by Byod on · organisation based in United States

Disclosed
Oct 7, 2026
Leak-site listing date
Threat group
Byod
11 victims listed
Country
United States
#1 most targeted
Sector
Technology

ThreatAI analysis

Compiled from this incident record and the threat intelligence profile for Byod. Figures and technique mappings are quoted from the source data, not inferred.

Byod listed telecommunications firm TMobile on its dark web leak site on 7 October 2026; TMobile is based in the United States and operates in technology sector.

About the Byod group

Byod has listed 3 victims since September 2026.

Incident analysis

TMobile was listed by Byod ransomware, a group with 11 victims recorded in this database. The listing appeared on the group's leak site on October 7, 2026.

TMobile is based in United States and operates in the Technology sector. United States ranks #1 worldwide for ransomware disclosures, with 9,974 victims in this database.

Sector context. Technology companies hold intellectual property, customer data, and source code — all highly valuable assets. A successful ransomware attack can also put downstream customers at risk through supply chain exposure.

Byod typically follows a double extortion model: data is exfiltrated from the victim's systems before files are encrypted, so the victim faces two demands at once — pay to restore access, and pay to keep stolen data unpublished. The leak site, where this listing appeared, is the lever for the second demand.

Source. Public leak-site disclosures aggregated via the ransomware.live API. The disclosure date is when the listing was published, which can differ from the date of compromise. This site does not publish or link to stolen data. Last updated .

Frequently asked questions

Was TMobile attacked by ransomware?

Yes. TMobile was listed as a victim of the Byod ransomware group on October 7, 2026. The organisation is based in United States and operates in the Technology sector. The disclosure appeared on the group's dark web leak site.

Which ransomware group attacked TMobile?

TMobile was attacked by Byod ransomware. Byod is one of the most active ransomware groups, having claimed 11 victims globally. The group typically employs a double-extortion model: encrypting the victim's files and threatening to publish stolen data.

When did the TMobile ransomware attack occur?

The ransomware attack on TMobile was disclosed on October 7, 2026. This date reflects when the victim was published on the threat group's leak site, which may differ from the actual date of initial compromise.

What data was stolen in the TMobile ransomware attack?

The specific data stolen from TMobile has not been independently verified by this platform. Ransomware groups typically exfiltrate data before encrypting systems and use the threat of publication to pressure victims. As a Technology organisation, TMobile likely held source code, intellectual property, and customer data.

How can organisations protect against Byod attacks?

To defend against Byod and similar threat actors, organisations should: maintain regular offline backups tested for restoration; implement network segmentation to limit lateral movement; deploy multi-factor authentication on all remote access; use endpoint detection and response (EDR) tools; conduct regular phishing and security awareness training; and monitor threat intelligence feeds for indicators of compromise (IOCs) associated with active groups.