IMPORTANT: No additional bug fixes or documentation updates will be released for this version. For the latest information, see the current release documentation.

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Unusual Linux User Calling the Metadata Service

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Unusual Linux User Calling the Metadata Service

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Looks for anomalous access to the cloud platform metadata service by an unusual user. The metadata service may be targeted in order to harvest credentials or user data scripts containing secrets.

Rule type: machine_learning

Machine learning job: v3_linux_rare_metadata_user

Machine learning anomaly threshold: 75

Severity: low

Risk score: 21

Runs every: 15 minutes

Searches indices from: now-45m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

Tags:

Elastic
Host
Linux
Threat Detection
ML
Credential Access

Version: 5 (version history)

Added (Elastic Stack release): 7.10.0

Last modified (Elastic Stack release): 8.4.0

Rule authors: Elastic

Rule license: Elastic License v2

Potential false positives

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A newly installed program, or one that runs under a new or rarely used user context, could trigger this detection rule. Manual interrogation of the metadata service during debugging or troubleshooting could trigger this rule. ==== Threat mapping

Framework: MITRE ATT&CK^TM

Tactic:
- Name: Credential Access
- ID: TA0006
- Reference URL: https://attack.mitre.org/tactics/TA0006/
Technique:
- Name: Unsecured Credentials
- ID: T1552
- Reference URL: https://attack.mitre.org/techniques/T1552/

Rule version history

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Version 5 (8.4.0 release)

Formatting only

Version 4 (8.3.0 release)

Formatting only

Version 3 (7.14.0 release)

Formatting only

Version 2 (7.12.0 release)

Formatting only

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