[New Rule] Unusual Linux Network Connection Discovery (#266)

* Create ml_linux_system_network_connection_discovery.toml ML rule to accompany the unsual network connection discovery job * Update ml_linux_system_network_connection_discovery.toml set author * Update ml_linux_system_network_connection_discovery.toml added fasle positve field * Update ml_linux_system_network_connection_discovery.toml * Update ml_linux_system_network_connection_discovery.toml linting * Update rules/ml/ml_linux_system_network_connection_discovery.toml Co-authored-by: Justin Ibarra <brokensound77@users.noreply.github.com> * Update ml_linux_system_network_connection_discovery.toml Co-authored-by: Justin Ibarra <brokensound77@users.noreply.github.com>
2020-09-22 16:27:17 -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 = 25
+author = ["Elastic"]
+description = """
+Looks for commands related to system network connection 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 by a threat actor
+to engage in system network connection discovery in order to increase their understanding of connected services and
+systems. This information may be used to shape follow-up behaviors such as lateral movement or additional discovery.
+"""
+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_network_connection_discovery"
+name = "Unusual Linux Network Connection Discovery"
+risk_score = 21
+rule_id = "c28c4d8c-f014-40ef-88b6-79a1d67cd499"
+severity = "low"
+tags = ["Elastic", "Linux", "ML"]
+type = "machine_learning"
+[[rule.threat]]
+framework = "MITRE ATT&CK"
+[[rule.threat.technique]]
+id = "T1049"
+name = "System Network Connections Discovery"
+reference = "https://attack.mitre.org/techniques/T1049/"
+
+
+[rule.threat.tactic]
+id = "TA0007"
+name = "Discovery"
+reference = "https://attack.mitre.org/tactics/TA0007/"