Cyber Incident Victim: Kisters AG
Date:
Nov 2021
Location:
Germany
Summary
A German critical infrastructure supplier specializing in energy systems suffered an orchestrated ransomware attack, disrupting operations and prompting a comprehensive system redesign to ensure customer security. The attackers, identified as Conti threat actors, exfiltrated data and later published a portion of it on their leak site after the victim refused ransom demands. Forensic analyses indicated no compromise in the company's delivered software products, though potential customer data exposure remained under investigation. Restoration efforts involved rigorous integrity checks of backup data and phased reactivation of cloud services, accompanied by continuous monitoring for anomalies. Authorities were engaged to pursue criminal prosecution of any data publication, while affected customers were to be notified directly if their information was implicated.
| CIA Posture | Motives | Tactics, Techniques & Procedures |
|---|---|---|
| Available to members | 1 motive | 1 technique |
| Threat Actor | Type | Location |
|---|---|---|
| 1 actor | Available to members | Available to members |
Description
On November 10-11, 2021, German critical infrastructure supplier Kisters AG suffered a ransomware attack impacting its operations. As a provider of energy systems software, the incident raised concerns about potential downstream compromises across its customer base. Initial forensic analysis by November 21 confirmed no evidence of compromise in the company's delivered software products, alleviating immediate risks to client installations. By November 23, Kisters initiated comprehensive system redesigns to enhance security, simultaneously verifying backup data integrity before restoration. The company planned phased cloud system reactivation starting November 24, with immediate abnormality monitoring scheduled for November 25. Customer access would be restored incrementally through subsequent weeks, with account managers coordinating reactivation timelines.
Kisters formally notified data protection authorities of the breach by November 30 while publicly refusing ransom demands, anticipating potential data publication by attackers. The company committed to directly notifying customers if forensic reviews confirmed compromise of their information and collaborated with law enforcement to pursue criminal charges against perpetrators. On December 2, the Conti ransomware group listed Kisters.de on its leak site, claiming publication of 5% of exfiltrated data, though the listing was temporarily inaccessible during initial verification checks. Kisters maintained its non-negotiation stance as external monitors continued tracking the leak site for further developments. Restoration efforts for cloud systems proceeded alongside ongoing forensic analysis, with no additional data disclosures confirmed at the time of reporting.