Chinese group deploying ransomware (HUI Loader, Cobalt Strike) potentially as cover for espionage, cycling through multiple ransomware families. This profile is mapped to MITRE ATT&CK G1021 and covers attribution, tooling, targeting, and defensive recommendations based on observed campaigns.
Overview & Attribution
Cinnamon Tempest (also tracked as BRONZE STARLIGHT, Emperor Dragonfly, DEV-0401) is a threat group attributed to China. The group primarily targets Global, various sectors for intelligence collection and operational objectives aligned with state interests.
This group is tracked as G1021 in the MITRE ATT&CK framework. All techniques referenced in this report are mapped to ATT&CK for consistent threat modeling and detection engineering.
Arsenal & Tools
Known tools and malware associated with Cinnamon Tempest include:
- HUI Loader
- Cobalt Strike
- LockFile
- AtomSilo
Targeting & Operations
Cinnamon Tempest operations focus on Global, various sectors. The group typically gains initial access through spear-phishing, exploitation of public-facing applications, or strategic web compromises before deploying custom implants for persistent access and data exfiltration.
Organizations in the Global sector should treat Cinnamon Tempest as a relevant threat and validate their detection coverage against the MITRE ATT&CK techniques listed below.
MITRE ATT&CK Mapping
Key techniques observed in Cinnamon Tempest operations:
| Technique ID | Technique Name | Tactical Context |
|---|---|---|
| T1486 | T1486 | Observed in Cinnamon Tempest campaigns |
| T1059.001 | T1059.001 | Observed in Cinnamon Tempest campaigns |
| T1574.002 | T1574.002 | Observed in Cinnamon Tempest campaigns |
| T1071.001 | T1071.001 | Observed in Cinnamon Tempest campaigns |
Full ATT&CK mapping: https://attack.mitre.org/groups/G1021/
Notable Campaigns
This threat group has been active in operations targeting Global, various sectors. Security researchers have documented campaigns involving HUI Loader and other tools deployed against organizations in multiple countries. Attribution confidence varies by campaign, but consistent infrastructure and TTP overlap links activity to China-nexus operations.
Detection & Defense
Recommended defensive measures against Cinnamon Tempest:
- Network monitoring: Detect C2 beaconing patterns associated with HUI Loader and related implants
- Endpoint detection: Deploy behavioral rules for the ATT&CK techniques above, particularly T1486 and T1059.001
- Email security: Implement robust phishing defenses including URL sandboxing and attachment detonation
- Patch management: Prioritize patching of internet-facing applications exploited by this group
- Threat hunting: Proactively hunt for IOCs and behavioral indicators mapped to G1021 in MITRE ATT&CK
How Mjolnir Security Can Help
Defend Against Cinnamon Tempest
Mjolnir Security provides tailored threat intelligence, detection engineering, and incident response services to help organizations defend against China-nexus threat actors.
Contact us: mjolnirsecurity.com
Stay ahead of emerging threats. Get notified when we publish new intelligence reports and advisories.
Subscribe to Alerts