DR Linux Rule Tuning 8.9 (#2859)

Co-authored-by: Ruben Groenewoud <78494512+Aegrah@users.noreply.github.com>

rules/linux/execution_python_tty_shell.toml

@@ -2,7 +2,7 @@
 creation_date = "2020/04/15"
 integration = ["endpoint"]
 maturity = "production"
-updated_date = "2023/06/22"
+updated_date = "2023/06/29"
 min_stack_comments = "New fields added: required_fields, related_integrations, setup"
 min_stack_version = "8.3.0"
 
@@ -13,24 +13,25 @@ Identifies when a terminal (tty) is spawned via Python. Attackers may upgrade a
 interactive tty after obtaining initial access to a host.
 """
 from = "now-9m"
-index = ["logs-endpoint.events.*"]
+index = ["logs-endpoint.events.*", "endgame-*"]
 language = "eql"
 license = "Elastic License v2"
 name = "Interactive Terminal Spawned via Python"
 risk_score = 73
 rule_id = "d76b02ef-fc95-4001-9297-01cb7412232f"
 severity = "high"
+timestamp_override = "event.ingested"
 tags = ["Domain: Endpoint", "OS: Linux", "Use Case: Threat Detection", "Tactic: Execution", "Data Source: Elastic Endgame"]
-timeline_id = "e70679c2-6cde-4510-9764-4823df18f7db"
-timeline_title = "Comprehensive Process Timeline"
 type = "eql"
 
 query = '''
-sequence with maxspan=1m
-  [process where host.os.type == "linux" and event.type == "start" and process.name : "python*"] by process.entity_id
-  [process where host.os.type == "linux" and event.type == "start" and 
-   process.executable : "/bin/*sh"
-  ] by process.parent.entity_id
+process where host.os.type == "linux" and event.action in ("exec", "exec_event") and
+(
+  (process.parent.name : "python*" and process.name : "*sh" and process.parent.args_count >= 3 and
+   process.parent.args : "*pty.spawn*" and process.parent.args : "-c") or
+  (process.parent.name : "python*" and process.name : "*sh" and process.args : "*sh" and process.args_count == 1
+   and process.parent.args_count == 1)
+)
 '''
 
 
@@ -50,4 +51,3 @@ reference = "https://attack.mitre.org/techniques/T1059/"
 id = "TA0002"
 name = "Execution"
 reference = "https://attack.mitre.org/tactics/TA0002/"
-