Jonhnathan
35 lines
1.3 KiB
TOML
35 lines
1.3 KiB
TOML
[metadata]
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creation_date = "2021/06/10"
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maturity = "production"
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updated_date = "2021/06/10"
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min_stack_version = "7.14.0"
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[rule]
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anomaly_threshold = 75
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author = ["Elastic"]
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description = """
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A machine learning job found an unusual user name in the authentication logs. An unusual user name is one way of
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detecting credentialed access by means of a new or dormant user account. An inactive user account (because the user
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has left the organization) that becomes active may be due to credentialed access using a compromised account password.
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Threat actors will sometimes also create new users as a means of persisting in a compromised web application.
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"""
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false_positives = [
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"""
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User accounts that are rarely active, such as a site reliability engineer (SRE) or developer logging into a
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production server for troubleshooting, may trigger this alert. Under some conditions, a newly created user account
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may briefly trigger this alert while the model is learning.
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""",
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]
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from = "now-30m"
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interval = "15m"
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license = "Elastic License v2"
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machine_learning_job_id = "auth_rare_user"
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name = "Rare User Logon"
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references = ["https://www.elastic.co/guide/en/security/current/prebuilt-ml-jobs.html"]
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risk_score = 21
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rule_id = "138c5dd5-838b-446e-b1ac-c995c7f8108a"
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severity = "low"
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tags = ["Elastic", "Authentication", "Threat Detection", "ML"]
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type = "machine_learning"
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