Nightspire Ransomware

Description Summary

64 orgs Mar–Jun 2025, growing to 316 claimed by Aug 2026.

Threat Actor

RaaS, double extortion; victim-specific payloads (UUID/MachineGUID); initial access via RDP + remote admin tooling; 48h publication deadlines.

Technical Indicators

Encryption Extension
.nspire (also silently encrypts OneDrive files without changing extension)
Encryption Algorithm
Not publicly reported
Ransom Note Name
Not publicly reported
Targeted Industries
Cross-sector (retail, manufacturing, healthcare, finance, maritime, education)
First Seen
February 2025 (leak site 12 March 2025)
Last Seen
Active (316 claimed by Aug 2026)
Geographical Location
Global; US-heavy

MITRE ATT&CK Matrix

Tactic TTP Technique Name
Impact x 2 T1486 Data Encrypted for Impact
T1490 Inhibit System Recovery
Exfiltration x 1 T1567 Exfiltration Over Web Service (leak site)
Initial Access x 2 T1190 Exploit Public-Facing Application
T1078 Valid Accounts