Norsk Hydro ransomware attack disrupts global aluminum operations
Norsk Hydro reported a ransomware attack in March 2019 that disrupted operations across its global aluminum and energy business, forcing parts of the organization into manual processes. Public reporting and case studies described significant operational disruption and material recovery costs reported by the company in subsequent communications. The incident has been used as a widely referenced case study in ransomware response and business continuity planning.
First reported March 19, 2019Ransomwaremed overall confidence
T1486: The incident involved ransomware encryption leading to operational disruption and recovery activities.
Mitigations
Now
Maintain offline/immutable backups and regularly test restoresEnables recovery without paying ransom and reduces business downtime when systems are encrypted or wiped.
Soon
Segment networks and restrict administrative privilegesSlows attacker movement and limits the blast radius of ransomware deployment across the enterprise.
Later
Harden endpoints/servers with EDR and restrict remote admin toolsImproves detection and blocking of ransomware behaviors and common lateral-movement mechanisms used to deploy payloads.
Detection ideas
Detect mass file encryption or destructive file operations
Alert on rapid renames/overwrites across many directories, creation of ransom notes, and high-entropy writes by unfamiliar processes.
Data sources: EDR telemetry, File integrity monitoring, Windows Security Event Logs
Detect lateral movement and remote execution used for ransomware deployment
Look for PsExec/SMB service creation, remote scheduled tasks, or WMIC usage followed by execution of the same binary on multiple hosts.
Data sources: EDR telemetry, Windows Security Event Logs, Network flow logs
