HOMETHREATSNanHaiShu
MALWARE FAMILY

NanHaiShu

Internal ID: js.nanhaishu
1
aliases
Last seen:Mar 17, 2026

Intelligence Profile

NanHaiShu is a remote access tool and JScript backdoor used by Leviathan. NanHaiShu has been used to target government and private-sector organizations that have relations to the South China Sea dispute.

Threat Analysis

NanHaiShu is a malware family tracked by threat intelligence researchers and catalogued in the Malpedia dataset. It represents a distinct malicious software lineage with identifiable code characteristics, behaviors, and victimology.

External References

→https://www.f-secure.com/documents/996508/1030745/nanhaishu_whitepaper.pdf
→https://community.spiceworks.com/topic/1028936-stealthy-cyberespionage-campaign-attacks-with-social-engineering
→https://www.proofpoint.com/us/threat-insight/post/leviathan-espionage-actor-spearphishes-maritime-and-defense-targets
→https://attack.mitre.org/software/S0228/

Quick Facts

TypeMalware Family
Aliases1

Also Known As

js.nanhaishu

Research Links

MITRE ATT&CK VirusTotal Google (news) Twitter/X search
Data sourced from Malpedia, Ransomware.live, RansomLook, and CTIWATCH OSINT collection. Actor attribution is based on available intelligence and may be incomplete.
← All Threat Actors·Geopolitics Map·Search NanHaiShu