Brazilian group conducting targeted attacks to steal proprietary information and blackmail victims into hiring them as security consultants. This profile is mapped to MITRE ATT&CK G0033 and covers attribution, tooling, targeting, and defensive recommendations based on observed campaigns.
Overview & Attribution
Poseidon Group (also tracked as None publicly documented) is a threat group attributed to Brazil. The group primarily targets Multinational companies, government (Brazil) for intelligence collection and operational objectives aligned with state interests.
This group is tracked as G0033 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 Poseidon Group include:
- Custom implants
- IGT Suites
Targeting & Operations
Poseidon Group operations focus on Multinational companies, government (Brazil). 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 Multinational companies sector should treat Poseidon Group 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 Poseidon Group operations:
| Technique ID | Technique Name | Tactical Context |
|---|---|---|
| T1566.001 | T1566.001 | Observed in Poseidon Group campaigns |
| T1059.001 | T1059.001 | Observed in Poseidon Group campaigns |
| T1005 | T1005 | Observed in Poseidon Group campaigns |
| T1041 | T1041 | Observed in Poseidon Group campaigns |
Full ATT&CK mapping: https://attack.mitre.org/groups/G0033/
Notable Campaigns
This threat group has been active in operations targeting Multinational companies, government (Brazil). Security researchers have documented campaigns involving Custom implants and other tools deployed against organizations in multiple countries. Attribution confidence varies by campaign, but consistent infrastructure and TTP overlap links activity to Brazil-nexus operations.
Detection & Defense
Recommended defensive measures against Poseidon Group:
- Network monitoring: Detect C2 beaconing patterns associated with Custom implants and related implants
- Endpoint detection: Deploy behavioral rules for the ATT&CK techniques above, particularly T1566.001 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 G0033 in MITRE ATT&CK
How Mjolnir Security Can Help
Defend Against Poseidon Group
Mjolnir Security provides tailored threat intelligence, detection engineering, and incident response services to help organizations defend against Brazil-nexus threat actors.
Contact us: mjolnirsecurity.com
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