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Medium

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.

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.

Connected intelligence

Signal brief

Follow the organization, likely method and potential impact to explore connected Shadow Tier intelligence.

02

Likely method

Ransomware

Malware, Error activity

03

Potential impact

Data Exposure

Confidentiality, Availability

Published
Jun 11, 2025
Updated
Jun 26, 2026
Confidence
Medium
Evidence
2 sources

Structured assessment

Signal analysis

This 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.

Threat source

Malware, Error activity

Watch ransomware, endpoint compromise and business interruption exposure.

  • Source type: possible insider or internal misuse

Business impact

Potential operational disruption
Impact area
Confidentiality, Availability
Likely asset
User or customer data

Mentioned entities

ChainiqData DisclosureWorldleaks Ransomware Group On JuneWorldleaksChain IQSwissRansomwareStolen

Quick context

Questions about this signal

What happened in this signal?

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.

When was this signal reported?

Shadow Tier lists Jun 11, 2025 as the signal date.

Which organization is connected to this signal?

Chainiq is the organization connected to this public signal.

Explore Chainiq
Which attack pattern is relevant?

This signal is connected to current ransomware incidents based on its reported incident context.

Explore current ransomware incidents
Which impact area is relevant?

This signal is connected to data exposure and breach intelligence based on its reported consequences.

Explore data exposure and breach intelligence