G0033: Poseidon Group
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. [1]
Security context for executives and security teams
G0033: Poseidon Group describes [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)
Executive priority
G0033: Poseidon Group is an official MITRE ATT&CK group. Glexia treats it as defensive behavior context for prioritizing monitoring, control validation, and response planning without using the object by itself as an attribution claim.
Technical view
Security teams should validate G0033: Poseidon Group by reviewing the official ATT&CK relationships, mapped tactics (the mapped ATT&CK tactic context), supported platforms (the platforms named in the official object), and available local telemetry before making detection or mitigation decisions.
Likely telemetry
- Official ATT&CK relationships and object metadata
Detection direction
- Validate whether G0033: Poseidon Group appears in your detection coverage and tabletop scenarios.
- Use the object to align executive risk language with SOC, incident response, and detection engineering work.
- Do not treat ATT&CK relationship context as attribution without corroborating evidence.
Mitigation priorities
- Map the object to existing controls and identify missing telemetry or response ownership.
- Prioritize mitigations that reduce exposure on the listed platforms and tactics.
- Review adjacent ATT&CK relationships before changing policy, detections, or reporting language.
Additional notes and limits
Baseline Glexia take generated from the official MITRE ATT&CK STIX object, source hash, tactics, platforms, and detection fields. It is safe to replace with a richer model-generated take for the same source hash later.
This baseline take is source-grounded and schema-validated, but it does not include environment-specific telemetry, incident evidence, or threat-intelligence corroboration.
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Poseidon Group
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. [1]
How security teams should use this page
Treat this object as behavior context, not an attribution claim. Validate the related groups, software, data sources, and mitigations against official ATT&CK relationships and your own telemetry before making control-coverage decisions.
Techniques used
This mirrors the MITRE pattern of making group, software, campaign, and technique relationships scannable. Relationship notes come from mirrored ATT&CK relationship text when available.
| Domain | ID | Name | Relationship / procedure |
|---|---|---|---|
| Enterprise | T1049 | System Network Connections Discovery | Poseidon Group obtains and saves information about victim network interfaces and addresses.[1] |
| Enterprise | T1007 | System Service Discovery | After compromising a victim, Poseidon Group discovers all running services.[1] |
| Enterprise | T1087.002 | Domain AccountSub-technique | Poseidon Group searches for administrator accounts on both the local victim machine and the network.[1] |
| Enterprise | T1087.001 | Local AccountSub-technique | Poseidon Group searches for administrator accounts on both the local victim machine and the network.[1] |
| Enterprise | T1057 | Process Discovery | After compromising a victim, Poseidon Group lists all running processes.[1] |
| Enterprise | T1036.005 | Match Legitimate Resource Name or LocationSub-technique | Poseidon Group tools attempt to spoof anti-virus processes as a means of self-defense.[1] |
| Enterprise | T1059.001 | PowerShellSub-technique | The Poseidon Group's Information Gathering Tool (IGT) includes PowerShell components.[1] |
| Enterprise | T1003 | OS Credential Dumping | Poseidon Group conducts credential dumping on victims, with a focus on obtaining credentials belonging to domain and database servers.[1] |
All related ATT&CK context
Object version and sync metadata
The fields below describe the current mirrored snapshot. When Glexia retains multiple ATT&CK source imports, you can open the table to compare the same object across releases (hashes and MITRE timestamps). For MITRE’s own release notes and roadmap, see ATT&CK resources — Updates.
Imported snapshots across ATT&CK releases(2)
| Release | Bundle imported | Object version | Modified | Status | Raw hash |
|---|---|---|---|---|---|
| 19.2 | 1.1 | Current bundle | 909af479e8d6… | ||
| 19.1 | 1.1 | Older bundle | c2ed00ecbd53… |
Mirrored ATT&CK source object
The raw object is retained through the mirrored ATT&CK source bundle and object hash. The raw endpoint returns the exact object from the mirrored bundle when available.
External references and citations
MITRE external references are preserved separately from Glexia analysis so citations remain traceable to their original source records.
- [1]Kaspersky Poseidon Group
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.
Open source URL - [2]Poseidon Group
(Citation: Kaspersky Poseidon Group)
- [3]mitre-attackG0033Open source URL
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