[New Rule] Unusual Linux Process Discovery Activity (#261)

* Create ml_linux_system_process_discovery.toml * Update ml_linux_system_process_discovery.toml * Update ml_linux_system_process_discovery.toml added fp field * Update ml_linux_system_process_discovery.toml * Update ml_linux_system_process_discovery.toml * Update rules/ml/ml_linux_system_process_discovery.toml Co-authored-by: Brent Murphy <56412096+bm11100@users.noreply.github.com> * linting Co-authored-by: Brent Murphy <56412096+bm11100@users.noreply.github.com> Co-authored-by: Brent Murphy <bmurphy@endgame.com>
2020-09-22 16:15:36 -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 = 50
+author = ["Elastic"]
+description = """
+Looks for commands related to system process 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 process discovery in order to increase their understanding of software applications running on a target host
+or network. This may be a precursor to selection of a persistence mechanism or a method of privilege elevation.
+"""
+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_process_discovery"
+name = "Unusual Linux Process Discovery Activity"
+risk_score = 21
+rule_id = "5c983105-4681-46c3-9890-0c66d05e776b"
+severity = "low"
+tags = ["Elastic", "Linux", "ML"]
+type = "machine_learning"
+[[rule.threat]]
+framework = "MITRE ATT&CK"
+[[rule.threat.technique]]
+id = "T1057"
+name = "Process Discovery"
+reference = "https://attack.mitre.org/techniques/T1057/"
+
+
+[rule.threat.tactic]
+id = "TA0007"
+name = "Discovery"
+reference = "https://attack.mitre.org/tactics/TA0007/"
+