HOMETHREATSNanHaiShu
APT / THREAT GROUP

NanHaiShu

2
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 known-sophistication threat actor of undetermined national origin, engaged in cyber operations with a primary motivation of unknown activity patterns.

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

TypeAPT / Threat Group
Aliases2

Also Known As

js.nanhaishuNanHaiShu

External Intelligence

Malpedia: 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.
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