Chinese group targeting law firms and investment companies, known for using strategic web compromises and zero-day exploits. This profile is mapped to MITRE ATT&CK G0073 and covers attribution, tooling, targeting, and defensive recommendations based on observed campaigns.
Overview & Attribution
APT19 (also tracked as Codoso, C0d0so0, Sunshop Group) is a threat group attributed to China. The group primarily targets Legal, investment, technology sectors for intelligence collection and operational objectives aligned with state interests.
This group is tracked as G0073 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 APT19 include:
- Derusbi
- Sakula
- Bemstour
Targeting & Operations
APT19 operations focus on Legal, investment, technology 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 Legal sector should treat APT19 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 APT19 operations:
| Technique ID | Technique Name | Tactical Context |
|---|---|---|
| T1189 | T1189 | Observed in APT19 campaigns |
| T1190 | T1190 | Observed in APT19 campaigns |
| T1059.001 | T1059.001 | Observed in APT19 campaigns |
| T1071.001 | T1071.001 | Observed in APT19 campaigns |
Full ATT&CK mapping: https://attack.mitre.org/groups/G0073/
Notable Campaigns
This threat group has been active in operations targeting Legal, investment, technology sectors. Security researchers have documented campaigns involving Derusbi 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 APT19:
- Network monitoring: Detect C2 beaconing patterns associated with Derusbi and related implants
- Endpoint detection: Deploy behavioral rules for the ATT&CK techniques above, particularly T1189 and T1190
- 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 G0073 in MITRE ATT&CK
How Mjolnir Security Can Help
Defend Against APT19
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
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