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Ransomware Leak kairos

Arwini

Data leak attributed to kairos, first discovered on 2026-05-11. Approximately 132,866 records were reported exposed.

Threat group
kairos
Records exposed
132,866
Discovered
2026-05-11
Country
DE
Indexed
2026-11-03
Source ID
29074

About this leak

Arbeitsgemeinschaft Wirtschaftlichkeitsprüfung Niedersachsen e.V. (ARWINI) is a registered association in Lower Saxony, Germany, whose public role is to host the joint Wirtschaftlichkeitsprüfung setup for statutory health insurance under SGB V. It brings together the KVN (the regional association of panel physicians) and the health insurers in a shared inspection / audit structure for contractual outpatient care. Day-to-day work covers procedures, consultations with physicians where relevant, and formal processes linked to efficiency and appropriateness of care and billing. The brand ARWINI is the short name used in official documents and online; arwini.de is the domain commonly associated with that name. Operationally the body sits in the social health sector rather than ordinary consumer or tech markets.

What is inside this leak sample

Indexed records
132,866
With email
•••
ID documents
•••
File types
•••
Corporate vs personal email
59.9% corporate · 40.1% personal
Top corporate email domains
% of corporate emails
arwini.de 12.61%
ewetel.net 1.87%
6 more hidden · Enterprise
File types present
csv •••
txt •••
More hidden · Enterprise
Analysed 2026-11-04
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