Ransomware group Storm hits Otto Sieve GmbH
Otto Sieve GmbH — a manufacturing target operating in DE has been listed by the Storm ransomware group on 2026-08-24. The information below reflects what the threat actor has publicly claimed on their leak site; the details have not been independently verified.
Incident Report
| Target Organization | Otto Sieve GmbH |
|---|---|
| Threat Group | Storm |
| Summary | Otto Sieve GmbH is a family-owned German company specializing in building services and modern home technology. Founded in 1967, the company provides heating, ventilation, sanitary, solar, and renewable energy solutions. Its services cover the planning, installation, maintenance, repair, and modernization of heating systems, bathrooms, heat pumps, solar technology, ventilation, and related building systems. Otto Sieve serves customers involved in new construction, renovation, and modernization projects and also provides maintenance and emergency repair services. The company emphasizes energy-efficient, sustainable solutions, technical expertise, personal consultation, and high-quality workmanship. Its headquarters is in Lohne, Lower Saxony, Germany. The company headquarters is located in Lindenstraße 102a, 49393 Lohne, Germany. 11-50 Employees |
| Date of Breach | 2026-08-24 |
| Discovery Date | 2026-08-27 |
| Region | DE |
| Target Domain | — |
| Business Sector | Manufacturing |
| Severity | MEDIUM |
Claim by Storm
Otto Sieve GmbH is a family-owned German company specializing in building services and modern home technology. Founded in 1967, the company provides heating, ventilation, sanitary, solar, and renewable energy solutions. Its services cover the planning, installation, maintenance, repair, and modernization of heating systems, bathrooms, heat pumps, solar technology, ventilation, and related building systems. Otto Sieve serves customers involved in new construction, renovation, and modernization projects and also provides maintenance and emergency repair services. The company emphasizes energy-efficient, sustainable solutions, technical expertise, personal consultation, and high-quality workmanship. Its headquarters is in Lohne, Lower Saxony, Germany. The company headquarters is located in Lindenstraße 102a, 49393 Lohne, Germany. 11-50 Employees
Posted by the Storm threat actor on its public leak site. This is the group's own statement and has not been independently verified by HackerFeeds.
Sources
Leak post (onion / Tor)
http://yqhecvqtdvq6p7duqcgw2qca77spbgakxcoibtx6zpvfshltsbbbhfqd.onion/company/6a8c10d7bcb899d105729a16
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Disclaimer
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