Cyber Incident Victim: Utrecht
Date:
Mar 2023
Location:
Netherlands
Summary
A data breach at Nebu impacted residents participating in the 'Sociale Kracht' study linked to the municipality of Woerden, though the specific compromised information and affected individuals remain unidentified. Investigators determined the attack methodology but found no evidence of stolen data being disseminated on dark web platforms or ransom demands, concluding that associated risks were limited. The municipality considers the matter resolved following the completion of this external investigation.
| CIA Posture | Motives | Tactics, Techniques & Procedures |
|---|---|---|
| Available to members | 2 motives | 1 technique |
| Threat Actors | Type | Location |
|---|---|---|
| 0 actors | Available to members | Available to members |
Description
The incident involved a data breach at Nebu, a company contracted by the municipality of Woerden to conduct the 'Sociale Kracht' social research survey. On March 24, 2023, the municipality announced the completion of an investigation into the breach, which potentially compromised personal information of Woerden residents who had been invited to participate in the survey. The cyberattack targeted Nebu's systems, though the exact method of intrusion was not publicly disclosed in the findings. Investigators hired by Nebu reconstructed the general progression of the attack but were unable to determine precisely which datasets were exfiltrated or which specific individuals were affected. This uncertainty persisted despite forensic efforts, leaving the scope of compromised personal information undefined. No evidence emerged suggesting the stolen data had been disseminated on dark web markets or other illicit platforms.
The absence of ransom demands or public data leaks led investigators to assess the risks to affected residents as limited. Municipal authorities relied on this assessment when deciding to close the case without further action, as no actionable threat indicators materialized. The breach exclusively impacted individuals selected for the 'Sociale Kracht' study, though the municipality did not disclose the total number of potentially affected residents. No technical vulnerabilities or containment measures within municipal systems were referenced, as the breach originated within Nebu's infrastructure. The municipality of Woerden formally considered the matter resolved upon publication of the investigation summary.