Threat Actor Profile
High
APT
Description
Poseidon Group is a Portuguese-speaking threat group that has been active since at least 2005. The group has a history of using information exfiltrated from victims to blackmail victim companies into contracting the Poseidon Group as a security firm. (Citation: Kaspersky Poseidon Group)
Confidence Score
Known Aliases
Poseidon Group
Tags
mitre-attack
stix-2.1
intrusion-set
First Seen
Unknown
Last Updated
Unknown
Active Status
ActiveCreated
April 29, 2026
MITRE ATT&CK Techniques (8)
Indicators of Compromise
Loading IOCs…
IOC KQL for Sentinel
STIX Data
{'aliases': ['Poseidon Group'],
'created': '2017-05-31T21:32:04.179Z',
'created_by_ref': 'identity--c78cb6e5-0c4b-4611-8297-d1b8b55e40b5',
'description': '[Poseidon Group](https://attack.mitre.org/groups/G0033) is a '
'Portuguese-speaking threat group that has been active since '
'at least 2005. The group has a history of using information '
'exfiltrated from victims to blackmail victim companies into '
'contracting the [Poseidon '
'Group](https://attack.mitre.org/groups/G0033) as a security '
'firm. (Citation: Kaspersky Poseidon Group)',
'external_references': [{'external_id': 'G0033',
'source_name': 'mitre-attack',
'url': 'https://attack.mitre.org/groups/G0033'},
{'description': '(Citation: Kaspersky Poseidon Group)',
'source_name': 'Poseidon Group'},
{'description': "Kaspersky Lab's Global Research and "
'Analysis Team. (2016, February 9). '
'Poseidon Group: a Targeted Attack '
'Boutique specializing in global '
'cyber-espionage. Retrieved March 16, '
'2016.',
'source_name': 'Kaspersky Poseidon Group',
'url': 'https://securelist.com/poseidon-group-a-targeted-attack-boutique-specializing-in-global-cyber-espionage/73673/'}],
'id': 'intrusion-set--7ecc3b4f-5cdb-457e-b55a-df376b359446',
'modified': '2025-04-25T14:49:33.223Z',
'name': 'Poseidon Group',
'object_marking_refs': ['marking-definition--fa42a846-8d90-4e51-bc29-71d5b4802168'],
'spec_version': '2.1',
'type': 'intrusion-set',
'x_mitre_attack_spec_version': '3.2.0',
'x_mitre_deprecated': False,
'x_mitre_domains': ['enterprise-attack'],
'x_mitre_modified_by_ref': 'identity--c78cb6e5-0c4b-4611-8297-d1b8b55e40b5',
'x_mitre_version': '1.1'}