[New Rule] Unusual Linux System Owner or User Discovery Activity (#267)

* Create ml_linux_system_user_discovery.toml ML rule to accompany the unusual system owner / user discovery job * Update rules/ml/ml_linux_system_user_discovery.toml Co-authored-by: Brent Murphy <56412096+bm11100@users.noreply.github.com> * Update ml_linux_system_user_discovery.toml added fp field * Update ml_linux_system_user_discovery.toml * Update ml_linux_system_user_discovery.toml * Update ml_linux_system_user_discovery.toml * Update ml_linux_system_user_discovery.toml lint * Update ml_linux_system_user_discovery.toml * Update rules/ml/ml_linux_system_user_discovery.toml Co-authored-by: Brent Murphy <56412096+bm11100@users.noreply.github.com> Co-authored-by: Brent Murphy <56412096+bm11100@users.noreply.github.com>
2020-09-22 16:22:41 -04:00
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+[metadata]
+creation_date = "2020/09/03"
+ecs_version = ["1.6.0"]
+maturity = "production"
+updated_date = "2020/09/03"
+
+[rule]
+anomaly_threshold = 75
+author = ["Elastic"]
+description = """
+Looks for commands related to system user or owner discovery from an unusual user context. This can be due to uncommon
+troubleshooting activity or due to a compromised account. A compromised account may be used to engage in system owner or
+user discovery in order to identify currently active or primary users of a system. This may be a precursor to additional
+discovery, credential dumping or privilege elevation activity.
+"""
+false_positives = [
+    """
+    Uncommon user command activity can be due to an engineer logging onto a server instance in order to perform manual
+    troubleshooting or reconfiguration.
+    """,
+]
+from = "now-45m"
+interval = "15m"
+license = "Elastic License"
+machine_learning_job_id = "linux_system_user_discovery"
+name = "Unusual Linux System Owner or User Discovery Activity"
+risk_score = 21
+rule_id = "59756272-1998-4b8c-be14-e287035c4d10"
+severity = "low"
+tags = ["Elastic", "Linux", "ML"]
+type = "machine_learning"
+[[rule.threat]]
+framework = "MITRE ATT&CK"
+[[rule.threat.technique]]
+id = "T1033"
+name = "System Owner/User Discovery"
+reference = "https://attack.mitre.org/techniques/T1033/"
+
+
+[rule.threat.tactic]
+id = "TA0007"
+name = "Discovery"
+reference = "https://attack.mitre.org/tactics/TA0007/"