Chain IQ Data Breach Claimed by Worldleaks Ransomware Group
On June 11, 2025, the Worldleaks ransomware group claimed responsibility for a cyberattack on Chain IQ, a Swiss procurement service provider, and published approximately 910 GB of stolen data on their dark web leak site. The stolen data, comprising over 1.9 million files, included business contact details of employees from 19 of Chain IQ's client companies, such as internal phone numbers. Chain IQ confirmed the incident, stating that no bank customer data was compromised, but employee business contact details of selected clients were exfiltrated.
Signal context
First seen: Jun 11, 2025
Last updated: Jun 26, 2026
Status: Public signal
Key points
- Ransomware group Worldleaks claimed attack on June 11, 2025.
- 910 GB of data and over 1.9 million files stolen.
- Stolen data included employee business contact details and internal phone numbers of client companies.
Signal analysis
BetaThis analysis groups the signal by industry, likely incident action and impacted security area. It helps compare this signal with other published signals without treating the labels as final determinations.
Sector: Finance and Insurance
Likely country: 🇪🇸 Spain
inferred from source domains
The feed marks multiple actor roles. Treat this as a review signal rather than a final attribution.
- Source type: outside the affected organization
- Source type: possible insider or internal misuse
Impact area: Confidentiality, Availability
Likely asset: User or customer data
- 21 signals in the same sector
- 100 signals with the same likely impact area
- 1 signal linked to this organization/domain
External sources
Chain IQ data breach affects major banks and companies in Switzerland - INCIBEhttps://www.incibe.es/en/incibe-cert/publications/cybersecurity-highlights/chain-iq-data-breach-affects-major-banks-and-companies-switzerlandPublic source from incibe.es.
Chain IQ, UBS Data Stolen in Ransomware Attack - SecurityWeekhttps://www.securityweek.com/chain-iq-ubs-data-stolen-in-ransomware-attack/Public source from securityweek.com.
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