This article provides a detailed analysis of the recent cyber attack involving the Kudankulam Nuclear Power Plant, focusing on a data breach via a third-party contractor's server. It outlines the scope of leaked files, the ransomware group responsible, and NPCIL's official response emphasizing that critical nuclear safety systems were not compromised. The report highlights supply chain risks and ongoing investigations by CERT-In.

The content offers actionable threat intelligence on a significant cyber incident affecting critical infrastructure, including technical details about the breach vector, data exposed, threat actor, and mitigation efforts. It is timely and provides valuable insights for defenders.

Defenders should review and strengthen supply chain cybersecurity controls, monitor for related ransomware activity, and coordinate with national CERTs to assess potential exposure from third-party vendors. Enhanced monitoring of contractor networks and validation of air-gapped system integrity is advised.